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440 repeater buildup

Horrible audio on TKR-820

I have been on and off battling this for a few weeks now. It's either too soft, too loud, overdriven, humming, whatever... So I dug into it this weekend and started ripping things apart. I also have  a Squelch board that I want to install, The squelch board uses discriminator audio to sence quieting and then give the controller a COR signal. The TKR-820 does not have a COR signal when the internal controller / signaling board is removed, at least none that I can find, I will still look into that.

It's already February!, NAQP, House Hunting, and more...

It's already February!, NAQP, House Hunting, and more... Wow, where does time go, well here is just a little summary of some of the ham projects I am working on....

70cm UHF Repeater Build Up, Update 4

Spent a few hours working on the repeater last night. I was attempting to finish up the radio to controller cabling, but it didn't quite go so well.  It turns out to be quite difficult to solder 3 coax audio cables and some control lines to a D-sub-9 connector. Poor eyesight is definitely a factor which I need to remedy! So after all the lines were connected and plugged in to both the repeater and controller I gave it a go.

Repeater Testing

Well, results are less then stellar at this point. It has about a 2 mile radius at best. This is with only 6 Watts of output. I am fairly sure it hears much better then it transmits, One of two things will have to happen. 1) get an amp! At 6W I am already over the 100% duty cycle rating of the TKR-820 (5W) I can go to 20W if I run a 50% duty cycle, but if anyone gets to rag chewing, it is going to stress it beyond what I am comfortable with. A nice 50 or 100 watt amp should be fine, probably go 50W to start, and move up from there.  2) A better antenna would help as well.

70cm UHF Repeater Build Up, Update 3

So, still working 12hr/day storm detail, although we should be winding down soon, I was able to get a couple hours to cobble together the basic setup for the 440 repeater. I made up the coax cables to connect with the duplexer. The repeater is...

70cm UHF Repeater Build Up, Update 2

 
Well..... I have not had time to even look at the parts for the repeater in almost a week. The CQ WW DX contest was last weekend, and Monday the East Coast was hit with Hurricane Sandy. Being that I work for the electric utility company we have been busy with 12hr shifts since Monday, and there is no end in sight. I also have no power at home, so it is dark and chilly at night

Repeater frequency coordination process.

Just  a quick update on the frequency coordination process for a 70cm repeater.   Wow... Who knew it would be so much work to pick a pair of frequencies for use for an amateur radio repeater. You would think with 120 frequency pairs in the 70cm band plan that....

70cm UHF Repeater Build Up, Update 1

70cm UHF Repeater Build Up, Update 1. Have been looking into what radios and what controller to use for my 440MHz repeater.

Why 70cm, and not 2M for my repeater?

So you may be asking yourself why I chose the 70cm band for my repeater and not the more popular 2M band. A couple reasons, read more >>
 

70cm UHF Repeater Build Up

So..... I have this crazy, or maybe not so crazy idea to attempt to build a 70cm (440Mhz) , band repeater for amateur use. Why you ask, Keep reading to find out.

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