Date   

Re: my DMR notes RE: tonights tech night

Robin Amundson
 

Excellent, clear and helpful info, Ryan. You are our DMR Elmer.

Next, try working some DX and see how many worldwide friends you make.

73,
Robin, WA7CPA

On Jun 27, 2019, at 11:32 PM, Ryan - KJ7GIE <@KJ7GIE> wrote:

[Edited Message Follows]

There was some interest in DMR, other digital modes as well, from tonights technical net. The first radio I bought was a BTech DMR-6x2 specifically so I could play with DMR immediately. Since I've owned this radio since before I was licensed I thought I'd share some info and maybe provide a path for others to get into DMR. We're lucky here in Washington that there is a really large DMR repeater network available for us to interact with and the DMR community is very helpful and active.

Information on DMR specific to this region can be found at https://www.pnwdigital.net
... and they just updated their website so now I cannot find anything. I'll provide direct links:
http://www.pnwdigital.net/welcome.html <-- This is kind of a step by step to get associated with PNW Digital and what the network does. How to obtain a radio ID and some other bits of info required to "get on DMR".
http://www.pnwdigital.net/quick-start.html <-- For those that want to read less.
http://www.trbo.org/docs/Amateur_Radio_Guide_to_DMR.pdf <-- For those that like to read more.

Besides the Pacific Northwest DMR repeater network you'll quickly see the word "brandmeister" in reference to DMR. PNW DMR is _not_ part of the Brandmeister network. What's the Brandmeister network? It's another DMR network of "repeaters". I put repeaters in quotes because, from what I can tell, most people access the brandmeister network using a hotspot.

Hotspot? It's a small box that is network on one side and radio on the other. The network side uses the internet (your home wifi, starbucks, etc.) to attach itself to the brandmeister network. The radio side uses a simplex frequency at very low power which you tune your radio to. Now you're accessing the worldwide brandmeister DMR network at .(point)5 watts using the Internet. And, that's about all I will type about that as I've not played with it and I don't own a hotspot. Just to add... The PNW DMR network is a c-bridge network and they support the use of hotspots via the HamWAN. That's as far as I understand those words as I've not played with HamWAN either.

How do I use DMR... There is a PNW DMR repeater on Cougar Mountain and I'm able to get into that repeater with DMR better than the SnoVARC repeater. DMR is half the width of analog FM plus it's digital so that helps with low power. Ignoring how DMR works on the commercial side (it was developed by Motorola for commercial radio use) let's only focus on the amateur community and how it works for us...

oh, and this is my interpretation based on my experience with PNW DMR as your experience with DMR may be different and especially if you use the brandmeister network...

PNW DMR has set-up a number of "talk groups". A talk group is used to trigger how many repeaters in the network you want to "turn on". For example, if you key-up on Washington 1 you will light every repeater in Washington state. Want to talk locally using only the repeater you're currently tuned to? Then use a local talk group. Want to test how your signal is? Use the Parrot talk group (yes, it repeats what you said back to you). The PNW DMR website explains what talk groups are available and what they are used for. Neat huh?

Now the bad news. DMR radios are a bear to program. In order to key a talk group you need to know the frequency, offset, and tone of the repeater. Standard stuff right? OK so here where it's not standard. The talk group you want to talk on is configured as the repeater details, the talk group ID, the color code, the time slot, and probably a few other things I'm forgetting. And each time you want to use a different repeater you need to enter that talk group again with the new repeater info. My DMR radio has 1,326 "talk groups" programmed into it because each talk group is duplicated on every PNW DMR repeater. But there is the good news...

The PNW DMR site has a website where you can download text files, CSV really, of the talk group configuration. With a bit of knowledge on how to manipulate text files you can use these to load the talk groups into your radio memory slots above or below the standard analog repeater list SnoVARC uses. That's basically what I did to get my radio programmed and now have a process in place it takes me ~10 min to get an updated list from PNW DMR and load it in my radio. Happy to help anyone here.

Digital Monitor or "promiscuous mode" - Turning this on in your radio let's you monitor, or scan, every talk group on the repeater. If someone is talking on Washington 1 or Local you'll hear them and then can switch to that talk group and respond. That's how a DMR radio can "hear" every talk group. You've got to have the radio set to that talk group in order to talk on that group though.

I'll stop here otherwise this could become a novel. I've always got my 6x2 with me at club events as it's my main radio. If you want to see it or want more info please just ask. I'm not an expert but I'll share what knowledge I have.

Oh.. and if you want to get a DMR radio I suggest the AnyTone 878. It's the most feature packed of the affordable HTs and is well supported within the PNW DMR groups.io page. The 6x2 is "ok" but is lacking a couple features of the 878 I now wish I had. Hope that is helpful and if you see some info in here which is wrong please correct. I stayed up later than I intended writing this so I expect there are some errors here and there. 73







my DMR notes RE: tonights tech night

Ryan - KJ7GIE
 
Edited

There was some interest in DMR, other digital modes as well, from tonights technical net. The first radio I bought was a BTech DMR-6x2 specifically so I could play with DMR immediately. Since I've owned this radio since before I was licensed I thought I'd share some info and maybe provide a path for others to get into DMR. We're lucky here in Washington that there is a really large DMR repeater network available for us to interact with and the DMR community is very helpful and active.

Information on DMR specific to this region can be found at https://www.pnwdigital.net
... and they just updated their website so now I cannot find anything. I'll provide direct links:
http://www.pnwdigital.net/welcome.html <-- This is kind of a step by step to get associated with PNW Digital and what the network does. How to obtain a radio ID and some other bits of info required to "get on DMR".
http://www.pnwdigital.net/quick-start.html <-- For those that want to read less.
http://www.trbo.org/docs/Amateur_Radio_Guide_to_DMR.pdf <-- For those that like to read more.

Besides the Pacific Northwest DMR repeater network you'll quickly see the word "brandmeister" in reference to DMR. PNW DMR is _not_ part of the Brandmeister network. What's the Brandmeister network? It's another DMR network of "repeaters". I put repeaters in quotes because, from what I can tell, most people access the brandmeister network using a hotspot.

Hotspot? It's a small box that is network on one side and radio on the other. The network side uses the internet (your home wifi, starbucks, etc.) to attach itself to the brandmeister network. The radio side uses a simplex frequency at very low power which you tune your radio to. Now you're accessing the worldwide brandmeister DMR network at .(point)5 watts using the Internet. And, that's about all I will type about that as I've not played with it and I don't own a hotspot. Just to add... The PNW DMR network is a c-bridge network and they support the use of hotspots via the HamWAN. That's as far as I understand those words as I've not played with HamWAN either.

How do I use DMR... There is a PNW DMR repeater on Cougar Mountain and I'm able to get into that repeater with DMR better than the SnoVARC repeater. DMR is half the width of analog FM plus it's digital so that helps with low power. Ignoring how DMR works on the commercial side (it was developed by Motorola for commercial radio use) let's only focus on the amateur community and how it works for us...

oh, and this is my interpretation based on my experience with PNW DMR as your experience with DMR may be different and especially if you use the brandmeister network...

PNW DMR has set-up a number of "talk groups". A talk group is used to trigger how many repeaters in the network you want to "turn on". For example, if you key-up on Washington 1 you will light every repeater in Washington state. Want to talk locally using only the repeater you're currently tuned to? Then use a local talk group. Want to test how your signal is? Use the Parrot talk group (yes, it repeats what you said back to you). The PNW DMR website explains what talk groups are available and what they are used for. Neat huh?

Now the bad news. DMR radios are a bear to program. In order to key a talk group you need to know the frequency, offset, and tone of the repeater. Standard stuff right? OK so here where it's not standard. The talk group you want to talk on is configured as the repeater details, the talk group ID, the color code, the time slot, and probably a few other things I'm forgetting. And each time you want to use a different repeater you need to enter that talk group again with the new repeater info. My DMR radio has 1,326 "talk groups" programmed into it because each talk group is duplicated on every PNW DMR repeater. But there is the good news...

The PNW DMR site has a website where you can download text files, CSV really, of the talk group configuration. With a bit of knowledge on how to manipulate text files you can use these to load the talk groups into your radio memory slots above or below the standard analog repeater list SnoVARC uses. That's basically what I did to get my radio programmed and now have a process in place it takes me ~10 min to get an updated list from PNW DMR and load it in my radio. Happy to help anyone here.

Digital Monitor or "promiscuous mode" - Turning this on in your radio let's you monitor, or scan, every talk group on the repeater. If someone is talking on Washington 1 or Local you'll hear them and then can switch to that talk group and respond. That's how a DMR radio can "hear" every talk group. You've got to have the radio set to that talk group in order to talk on that group though.

I'll stop here otherwise this could become a novel. I've always got my 6x2 with me at club events as it's my main radio. If you want to see it or want more info please just ask. I'm not an expert but I'll share what knowledge I have.

Oh.. and if you want to get a DMR radio I suggest the AnyTone 878. It's the most feature packed of the affordable HTs and is well supported within the PNW DMR groups.io page. The 6x2 is "ok" but is lacking a couple features of the 878 I now wish I had. Hope that is helpful and if you see some info in here which is wrong please correct. I stayed up later than I intended writing this so I expect there are some errors here and there. 73


Re: End Fed Half Wave setup

Dan Pflugrath
 

Ryan,
I must run a stealth antenna at my QTH. The transformer is at the peak of my house at 20 about feet with the antenna wire 26 gauge out to some trees, no ground or counterpoise other than the coax lead in. about 67 feet of wire gives me 40, 20, 15 and 10 meters without a tuner and 30, 18 and 12 meters with a tuner. It is not optimum but I make contacts with it using QRP power. The higher the better for the antenna wire but you use what you have. Let me know if you find a better solution and let me know if you need help? I can help you build one if you want.

Let me know if you find a better solution. I am always looking for a better stealth antenna.

73,
Dan Pflugrath KA7GPP
dpflugrath@...
425-941-2339

-----Original Message-----
From: snovarc@groups.io [mailto:snovarc@groups.io] On Behalf Of Ryan - KJ7GIE
Sent: Thursday, June 27, 2019 10:46 PM
To: snovarc@groups.io
Subject: Re: [snovarc] End Fed Half Wave setup

[Edited Message Follows]

Thank you everyone for the additional detail.

The reason for my question is that this is one solution I'm thinking about to get an HF antenna into my shack. My "shack" is upstairs in a bedroom and my 2/70 antenna is up in the attic. I've already run coax from the attic to the room. With that already in place the "easy" way to get an HF antenna run is to put the transformer/feed in the attic and attach to existing coax. Then drop the wire out of an attic vent to my fence and run the whatever additional feet is required along the wooden fence based upon whatever length / band(s) antenna I decide to go with. But I've not run into another example of the feed line being at the high point. Before I invested into this experiment I thought I'm ask the collective minds here.

So far I've not found that this will not work but it's obviously an additional comprise like every antenna. I will check out the FB group and continue to research. Still on the fence (pun intended) on if it's worth going forward with this design or scrapping it and finding another solution. Research never ends.

If I do decide to go forward with this idea I'm looking at ants from myantennas.com and chameleon.com. Not cheap stuff but then I don't have to do any of the math. I'll also e-mail them after I do more research. Again, appreciate the collective knowledge!





____________________________________________________________
1 Cup (Before Bed) Burns Belly Fat Like Crazy!
worldhealthlabs.com
http://thirdpartyoffers.juno.com/TGL3131/5d15af13290162f120a92st02vuc


Re: End Fed Half Wave setup

Ryan - KJ7GIE
 
Edited

Thank you everyone for the additional detail.

The reason for my question is that this is one solution I'm thinking about to get an HF antenna into my shack. My "shack" is upstairs in a bedroom and my 2/70 antenna is up in the attic. I've already run coax from the attic to the room. With that already in place the "easy" way to get an HF antenna run is to put the transformer/feed in the attic and attach to existing coax. Then drop the wire out of an attic vent to my fence and run the whatever additional feet is required along the wooden fence based upon whatever length / band(s) antenna I decide to go with. But I've not run into another example of the feed line being at the high point. Before I invested into this experiment I thought I'm ask the collective minds here.

So far I've not found that this will not work but it's obviously an additional comprise like every antenna. I will check out the FB group and continue to research. Still on the fence (pun intended) on if it's worth going forward with this design or scrapping it and finding another solution. Research never ends.

If I do decide to go forward with this idea I'm looking at ants from myantennas.com and chameleon.com. Not cheap stuff but then I don't have to do any of the math. I'll also e-mail them after I do more research. Again, appreciate the collective knowledge!


Re: End Fed Half Wave setup

Dan Pflugrath
 

The resonate end fed half wave EFHW antenna can be configured many ways and it will still work well.

 

The optimum is to place the 49:1 transformer near ground level and use an earth ground with the antenna wire cut to 1/2 wavelength at the lowest operating frequency.  The earth ground reduces noise but is not absolutely necessary.  The antenna wire works optimum in an inverted L configuration.  The coax lead in is the counter poise but with the antenna wire cut to 1/2 wavelength very little current flows in the coax counter poise.  Put an RF choke near your radio if you get RF in the shack.  Some radios are more sensitive to it than others.

 

The EFHW works as well as a 1/2 wave dipole but is also has low SWR at the multiples of the lowest operating frequency.   My 40 meter EFHW works with low SWR on 40, 20, 15, 12 and 10 meters.  There are ways to add to the antenna to get 30, 18 if needed.

 

For additional information and assistance see the End Fed Half Wave Facebook page at https://www.facebook.com/groups/EndFedHalfWaveAntennas/.  There is a ham on that page that has done considerable testing to assist with implementation.

 

This is a very popular antenna for Summits On The Air since it requires only one pole and can be either a slopper for 20 and 30 meters or an inverted V for 40 meters.  There are commercial versions available or check out the Facebook page for how easy they are to build.

 

73,

Dan KA7GPP

 

 

 

From: snovarc@groups.io [mailto:snovarc@groups.io] On Behalf Of Kirt / K7KDW
Sent: Thursday, June 27, 2019 8:47 PM
To: snovarc@groups.io
Subject: [snovarc] End Fed Half Wave setup

 

Putting this out there for others to chime in on.

During the New Ham Net tonight a question came up about setting up an End Fed Half Wave in an Inverted L configuration. 

The question was whether it mattered which end the feed point was on. My understanding is that this configuration, the feed point would be on the higher end of the "L". 

My first End Fed was a Chameleon Emcomm portable and I used their documentation on configurations with that and my MyAntennas EFHW. That document is here (PDF Warning) https://www.dropbox.com/sh/8gypgl2px8inh1k/AACF4Wr3LyK-Q5XFX2tHZ-GSa?dl=0&preview=CHA+EMCOMM+III+PORTABLE.pdf

I looked over the doc again but I couldn't find something that answered that question in there so I'm hoping someone else can give an answer to this.

Thanks
Kirt - K7KDW



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SponsoredBy Content.Ad


Re: End Fed Half Wave setup

Shawn / K7ATA
 

Seems more common to feed inverted Ls at the bottom, but every time, some radials are needed.

--Shawn
--K7ATA

On 6/27/2019 8:47 PM, Kirt / K7KDW wrote:
Putting this out there for others to chime in on.

During the New Ham Net tonight a question came up about setting up an End Fed Half Wave in an Inverted L configuration.

The question was whether it mattered which end the feed point was on. My understanding is that this configuration, the feed point would be on the higher end of the "L".

My first End Fed was a Chameleon Emcomm portable and I used their documentation on configurations with that and my MyAntennas EFHW. That document is here (PDF Warning) https://www.dropbox.com/sh/8gypgl2px8inh1k/AACF4Wr3LyK-Q5XFX2tHZ-GSa?dl=0&preview=CHA+EMCOMM+III+PORTABLE.pdf

I looked over the doc again but I couldn't find something that answered that question in there so I'm hoping someone else can give an answer to this.

Thanks
Kirt - K7KDW


Re: End Fed Half Wave setup

Ken Kosters
 

Actually I would put the feed point lowest to the ground (Tera ferma) as it would radiate more like vertical, dipole mix rather than inverted vertical beaming into the earth rather than sky. 

Ken

On Jun 27, 2019, at 8:47 PM, Kirt / K7KDW <kirtwhite@...> wrote:

Putting this out there for others to chime in on.

During the New Ham Net tonight a question came up about setting up an End Fed Half Wave in an Inverted L configuration. 

The question was whether it mattered which end the feed point was on. My understanding is that this configuration, the feed point would be on the higher end of the "L". 

My first End Fed was a Chameleon Emcomm portable and I used their documentation on configurations with that and my MyAntennas EFHW. That document is here (PDF Warning) https://www.dropbox.com/sh/8gypgl2px8inh1k/AACF4Wr3LyK-Q5XFX2tHZ-GSa?dl=0&preview=CHA+EMCOMM+III+PORTABLE.pdf

I looked over the doc again but I couldn't find something that answered that question in there so I'm hoping someone else can give an answer to this.

Thanks
Kirt - K7KDW


End Fed Half Wave setup

Kirt White / K7KDW
 

Putting this out there for others to chime in on.

During the New Ham Net tonight a question came up about setting up an End Fed Half Wave in an Inverted L configuration. 

The question was whether it mattered which end the feed point was on. My understanding is that this configuration, the feed point would be on the higher end of the "L". 

My first End Fed was a Chameleon Emcomm portable and I used their documentation on configurations with that and my MyAntennas EFHW. That document is here (PDF Warning) https://www.dropbox.com/sh/8gypgl2px8inh1k/AACF4Wr3LyK-Q5XFX2tHZ-GSa?dl=0&preview=CHA+EMCOMM+III+PORTABLE.pdf

I looked over the doc again but I couldn't find something that answered that question in there so I'm hoping someone else can give an answer to this.

Thanks
Kirt - K7KDW


Re: July Meeting date?

Lindy KG7IFA
 

Sorry.  I just updated the website to reflect there is no meeting on July 4th.  This was decided at the June meeting.  The next official meeting is August 1st. 

Lindy, KG7IFA

-----Original Message-----
From: Ken Koch WA7KK <groups@...>
To: snovarc <snovarc@groups.io>
Sent: Thu, Jun 27, 2019 4:03 pm
Subject: [snovarc] July Meeting date?

The snovarc.org shows that the July meeting is on July 4th.  I assume that it won't be unless there is something special going on.  Has there been another date set?


July Meeting date?

Ken Koch WA7KK
 

The snovarc.org shows that the July meeting is on July 4th.  I assume that it won't be unless there is something special going on.  Has there been another date set?


Weather cancels Big Rock this evening

Robin Amundson
 

Hi All,
Our next Big Rock gathering will be Thursday, July 11, beginning at 6 p.m. if weather cooperates. We will focus that evening on HT field programming and perhaps fox hunting for a "rabbit" transmitter.

Please check into Kirt's net at 7 p.m. and the SnoVARC equipment check net at 8 p.m.

Hope to see everyone July 11.

73,
Robin, WA7CPA


Re: Thursday night at the ball fields

Dale Smith
 

Greetings,

I will miss this Thursday's meet at the ball field.  I have a company social event to attend.

Regards,
Dale


HRO - Portland

Ryan - KJ7GIE
 

I _might_ be going to HRO tomorrow.

_If_ I can leave early enough in the AM to make it back to the park for Thursday's HAM at the park..... *Does anyone need anything and want me to pick it up?

Rain is in the forecast for tomorrow so, if the park event gets rained out it may be 2 weeks before I can get you whatever it is you asked for. Or you can always stop by and pick it up (I live within Carnation). Just let me know. Please be specific (part number, weblink on HRO's site, etc.)


Thursday night at the ball fields

Tom WA7TBP
 

For all of you that are interested, Jim, W7ABD, will be bringing his low power bunny hunt VHF transmitter as one of the things we can do. This is a chance for you to try out your direction finding project that the club did a mass purchase on within the last year. It is possible to find the bunny transmitter with just a hand held radio as well. Thanks to Jim for bringing his low power transmitter.

Tom, WA7TBP


Re: Thursday night gathering at ball fields

Robin Amundson
 

Sounds fun for all. We will do the direction finding along with being ready to help program Baofeng’s. I will save doing an FT8 setup for another week when I can do some publicity ahead of time toward teenagers and younger hams who may think digitizing radio waves is fun like computer games.

73,
Robin, WA7CPA 


On Jun 25, 2019, at 11:20 AM, W7ABD <w7abd1@...> wrote:

I have my 5mW fox transmitter that we could use.

Jim
W7ABD


On 06/25/19 11:16, Tom WA7TBP via Groups.Io wrote:
Hello all:

Would it be possible for us to have some practice with our direction finding equipment? I would like to have a radio bunny hunt or two under my belt before I go to a big radio bunny hunt next month.

TNX,

Tom, WA7TBP


Re: Thursday night gathering at ball fields

W7ABD
 

I have my 5mW fox transmitter that we could use.

Jim
W7ABD


On 06/25/19 11:16, Tom WA7TBP via Groups.Io wrote:
Hello all:

Would it be possible for us to have some practice with our direction finding equipment? I would like to have a radio bunny hunt or two under my belt before I go to a big radio bunny hunt next month.

TNX,

Tom, WA7TBP


Thursday night gathering at ball fields

Tom WA7TBP
 

Hello all:

Would it be possible for us to have some practice with our direction finding equipment? I would like to have a radio bunny hunt or two under my belt before I go to a big radio bunny hunt next month.

TNX,

Tom, WA7TBP


Re: <tap> <tap> is this thing on? Hello APRS!

Dan Pflugrath
 

If I put everything together with my Arduino UNO, load the firmware and WinLink will you assist myself and anyone else to make sure it works. It looks easy but there are some issues to making it work like loading the hex file, getting WinLink loaded and making adjustments to the audio levels. Help me and I am willing to help other club members doing the same.

I see where the same group, mobilinkd, has set up their TNC to link to Android by Bluetooth which could be very useful in the future.

Thanks again,
Dan KA7GPP

-----Original Message-----
From: snovarc@groups.io [mailto:snovarc@groups.io] On Behalf Of Shawn / K7ATA
Sent: Monday, June 24, 2019 9:15 PM
To: snovarc@groups.io
Subject: Re: [snovarc] <tap> <tap> is this thing on? Hello APRS!

Yes indeed, tied to the PC via USB, and it works perfectly with winlink.

--Shawn
--K7ATA

On 6/24/2019 9:09 PM, Dan Pflugrath wrote:
Shawn,
Nice work. Simple is beautiful.

I am a bit slow at this but do you then hook up the Arduino to your computer app by the USB port? I am assuming you could use this to run WinLink.

Thanks
Dan KA7GPP





-----Original Message-----
From: snovarc@groups.io [mailto:snovarc@groups.io] On Behalf Of Shawn / K7ATA
Sent: Monday, June 24, 2019 3:29 PM
To: snovarc@groups.io
Subject: Re: [snovarc] <tap> <tap> is this thing on? Hello APRS!

Simplicity itself; Simple schematic and protoboard view:
https://imgur.com/a/dkUQ03J

NPN is a 2n2222 or equivalent, arduino requires a firmware flashed onto
it with AVRdude


Firmware:
https://raw.githubusercontent.com/mobilinkd/tnc1/arduino/images/mobilinkd-473-arduino.hex


This is all based on the moblinkd design, and if you're a glutton for
punishment, I have a BOM for SMT build and the boards can be had from
oshpark: https://oshpark.com/shared_projects/rY0zpRke (yes, everything
fits UNDER an arduino nano)


--Shawn
--K7ATA

On 6/24/2019 2:50 PM, Ryan - KJ7GIE wrote:
its pretty easy to build a TNC for aprs with an arduino; I've done a
few. Average cost was ~$15 as one-off prototypes.
--Shawn
Mr. Shawn Sir,
Can you please post the BOM and design you use for your Arduino TNC? I'd be interested in putting one of these together. Thank you.






____________________________________________________________
US MD: "I Beg Americans To Throw Out This Veg Now"
dr-pedre-md.com
http://thirdpartyoffers.juno.com/TGL3131/5d119e9463b8b1e935052st01duc




Re: <tap> <tap> is this thing on? Hello APRS!

Shawn / K7ATA
 

Yes indeed, tied to the PC via USB, and it works perfectly with winlink.

--Shawn
--K7ATA

On 6/24/2019 9:09 PM, Dan Pflugrath wrote:
Shawn,
Nice work. Simple is beautiful.

I am a bit slow at this but do you then hook up the Arduino to your computer app by the USB port? I am assuming you could use this to run WinLink.

Thanks
Dan KA7GPP





-----Original Message-----
From: snovarc@groups.io [mailto:snovarc@groups.io] On Behalf Of Shawn / K7ATA
Sent: Monday, June 24, 2019 3:29 PM
To: snovarc@groups.io
Subject: Re: [snovarc] <tap> <tap> is this thing on? Hello APRS!

Simplicity itself; Simple schematic and protoboard view:
https://imgur.com/a/dkUQ03J

NPN is a 2n2222 or equivalent, arduino requires a firmware flashed onto
it with AVRdude


Firmware:
https://raw.githubusercontent.com/mobilinkd/tnc1/arduino/images/mobilinkd-473-arduino.hex


This is all based on the moblinkd design, and if you're a glutton for
punishment, I have a BOM for SMT build and the boards can be had from
oshpark: https://oshpark.com/shared_projects/rY0zpRke (yes, everything
fits UNDER an arduino nano)


--Shawn
--K7ATA

On 6/24/2019 2:50 PM, Ryan - KJ7GIE wrote:
its pretty easy to build a TNC for aprs with an arduino; I've done a
few. Average cost was ~$15 as one-off prototypes.
--Shawn
Mr. Shawn Sir,
Can you please post the BOM and design you use for your Arduino TNC? I'd be interested in putting one of these together. Thank you.






____________________________________________________________
US MD: "I Beg Americans To Throw Out This Veg Now"
dr-pedre-md.com
http://thirdpartyoffers.juno.com/TGL3131/5d119e9463b8b1e935052st01duc



Re: <tap> <tap> is this thing on? Hello APRS!

Dan Pflugrath
 

Shawn,
Nice work. Simple is beautiful.

I am a bit slow at this but do you then hook up the Arduino to your computer app by the USB port? I am assuming you could use this to run WinLink.

Thanks
Dan KA7GPP

-----Original Message-----
From: snovarc@groups.io [mailto:snovarc@groups.io] On Behalf Of Shawn / K7ATA
Sent: Monday, June 24, 2019 3:29 PM
To: snovarc@groups.io
Subject: Re: [snovarc] <tap> <tap> is this thing on? Hello APRS!

Simplicity itself; Simple schematic and protoboard view:
https://imgur.com/a/dkUQ03J

NPN is a 2n2222 or equivalent, arduino requires a firmware flashed onto
it with AVRdude


Firmware:
https://raw.githubusercontent.com/mobilinkd/tnc1/arduino/images/mobilinkd-473-arduino.hex


This is all based on the moblinkd design, and if you're a glutton for
punishment, I have a BOM for SMT build and the boards can be had from
oshpark: https://oshpark.com/shared_projects/rY0zpRke (yes, everything
fits UNDER an arduino nano)


--Shawn
--K7ATA

On 6/24/2019 2:50 PM, Ryan - KJ7GIE wrote:
its pretty easy to build a TNC for aprs with an arduino; I've done a
few. Average cost was ~$15 as one-off prototypes.
--Shawn
Mr. Shawn Sir,
Can you please post the BOM and design you use for your Arduino TNC? I'd be interested in putting one of these together. Thank you.







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