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building a repeater out of two Kenwood TK-880


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#101 n4gix

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Posted 10 March 2017 - 11:08 AM

The antenna i'm using is:
 
http://www.cometante...s/uhf-antennas/

 

Do yourself huge favor and slip an appropriate length of shrink tube over the middle joint on the antenna to provide a much better water seal.



#102 berkinet

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Posted 10 March 2017 - 11:40 AM

The antenna i'm using is:...
...CA-712EFC

Speaking of the antenna. I was curious why you chose the CA-712EFC over the CA-F72GF.

While there is no real great difference between the two for GMRS, I picked the F72GF for a couple of reasons others might want to consider. Although there was a little extra work cutting the antenna to length I was able to tune it spot on to our transmit frequency. Also, because I had to open it anyway, I was able to seal it up nice and tight on reassembly and I had a chance to check all the internal solder joints as they have a (somewhat undeserved) reputation for problems.

Everything we hear is an opinion, not a fact. Everything we see is a perspective, not the truth.

-- Marcus Aurelius


#103 Sasquatch

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Posted 10 March 2017 - 12:10 PM

How did you guys learn how to do all of this neat stuff? I'm struggling here with all the acronyms. :)  


De Oppresso Liber


#104 berkinet

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Posted 10 March 2017 - 06:32 PM

How did you guys learn how to do all of this neat stuff?...

By making lots of mistakes  ;)


  • Logan5 likes this

Everything we hear is an opinion, not a fact. Everything we see is a perspective, not the truth.

-- Marcus Aurelius


#105 Sasquatch

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Posted 10 March 2017 - 08:34 PM

I'm truly in the presence of greatness on this forum! :)  


De Oppresso Liber


#106 Steve

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Posted 12 March 2017 - 10:56 PM

Do yourself huge favor and slip an appropriate length of shrink tube over the middle joint on the antenna to provide a much better water seal.


That is really excellent advice. Thanks. I'll do that. The middle already had become brittle.
S

Sussex County, New Jersey.

I'm building a home DIY repeater system w Kenwood TK-880 & Elektra 2000

Comet CA-712EFC  + (Ed Fong PVC Jpole)

Baofeng UV-5R, 888S

Motorola GR1225 Repeater - EX600XLS


#107 Steve

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Posted 12 March 2017 - 10:56 PM

How did you guys learn how to do all of this neat stuff? I'm struggling here with all the acronyms. :)

Lots of research and trial and error.
  • Soladaddy likes this

Sussex County, New Jersey.

I'm building a home DIY repeater system w Kenwood TK-880 & Elektra 2000

Comet CA-712EFC  + (Ed Fong PVC Jpole)

Baofeng UV-5R, 888S

Motorola GR1225 Repeater - EX600XLS


#108 Steve

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Posted 12 March 2017 - 10:59 PM

Speaking of the antenna. I was curious why you chose the CA-712EFC over the CA-F72GF.
While there is no real great difference between the two for GMRS, I picked the F72GF for a couple of reasons others might want to consider. Although there was a little extra work cutting the antenna to length I was able to tune it spot on to our transmit frequency. Also, because I had to open it anyway, I was able to seal it up nice and tight on reassembly and I had a chance to check all the internal solder joints as they have a (somewhat undeserved) reputation for problems.


I preferred the higher gain. Plus you can open the "C" antenna up and check joints and seal them if needed.

Sussex County, New Jersey.

I'm building a home DIY repeater system w Kenwood TK-880 & Elektra 2000

Comet CA-712EFC  + (Ed Fong PVC Jpole)

Baofeng UV-5R, 888S

Motorola GR1225 Repeater - EX600XLS


#109 zap

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Posted 14 March 2017 - 01:26 PM

Lots of research and trial and error.


Well go with trial and error.

Like for weatherproofing connections, I much prefer Cell tape to butyl (coax seal). It's also easier to find as Ace and Tractor Supply often stock it as "Magic Tape". For line grounding, butyl is the best way to go though.


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#110 mainehazmt

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Posted 29 March 2017 - 05:07 PM

Learned a lot from the CB days working with a shop. But really learned it over a military career working with the local LMR shops mostly the big M....

#111 Steve

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Posted 25 June 2017 - 11:13 PM

https://youtu.be/W0D5bmlRx-U

 

I made some progress..... i'm keying into a dummy load for testing around the house... just need to finish mounting the controller and fans, and building out the rest of the custom cables and circuits for the utility power out alarm, and fan control relay. The idea is to have one box with everything contained that i can pull out and take home to service. Testing sounds great, no noise from power supply or tx into the controller. idle power is 15 watts draw on utility, and 40 watts on TX, and the RF tx is only around 10 watts out, im running the TX880 on low power, and i'm not sure how much power exactly, i killed my meter. But it runs very cool on TX low power. I need to get a new cross needle SWR and RF meter now.


  • Hans likes this

Sussex County, New Jersey.

I'm building a home DIY repeater system w Kenwood TK-880 & Elektra 2000

Comet CA-712EFC  + (Ed Fong PVC Jpole)

Baofeng UV-5R, 888S

Motorola GR1225 Repeater - EX600XLS


#112 Steve

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Posted 25 June 2017 - 11:16 PM

and some photos

 

https://goo.gl/photo...nU5TNpzWXnXqFm9


  • Logan5 likes this

Sussex County, New Jersey.

I'm building a home DIY repeater system w Kenwood TK-880 & Elektra 2000

Comet CA-712EFC  + (Ed Fong PVC Jpole)

Baofeng UV-5R, 888S

Motorola GR1225 Repeater - EX600XLS


#113 Steve

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Posted 26 February 2018 - 01:24 AM

I can't believe it has been almost 4 years since I started this build but finally, everything is done, solar, batteries, controller, custom cables, duplexer, control radio, control yagi antenna, mast, coax, etc.    half way installed, low power, antenna only at ground level, and works great.

 

photos:

https://goo.gl/photo...nU5TNpzWXnXqFm9

 

battery low voltage alarm:

https://www.youtube....h?v=n1JL3mUtiUI

 

Dtmf channel control gmrs repeater kenwood TK-880

https://www.youtube....h?v=0d06MtueMWM


  • Hans and berkinet like this

Sussex County, New Jersey.

I'm building a home DIY repeater system w Kenwood TK-880 & Elektra 2000

Comet CA-712EFC  + (Ed Fong PVC Jpole)

Baofeng UV-5R, 888S

Motorola GR1225 Repeater - EX600XLS


#114 berkinet

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Posted 26 February 2018 - 03:25 AM

Very nice.

Everything we hear is an opinion, not a fact. Everything we see is a perspective, not the truth.

-- Marcus Aurelius


#115 Soladaddy

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Posted 27 February 2018 - 11:19 AM

Digging the old PC tower case. Now that you have worked out all of the bugs, are you ready to mass produce on the cheap? lol.



#116 osculant

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Posted 01 April 2018 - 01:30 PM

Love this writeup, checked in over the last year and glad to see it basically 'done'. I have a tk-880 and have been playing with doing exactly what you've done here with an H, like you I also ended up getting an off the shelf repeater (gr300) to play with as well. Also for what it's worth I have two Ed Fong antennas I have been using for over a year and though my use has been limited to HAM and GMRS repeaters not too far,I haven't had any problems yet. The small footprint being referred to was it's wind profile, not it's coverage area.

What power supply did you end up using?



#117 axorlov

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Posted 01 April 2018 - 06:50 PM

As an owner of three tk-880h (two in cars, one in house), I love this build. Unlikely I will ever build a repeater, no need for me, but if I did, that would be a reference.




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