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Author Topic: R-820 Kenwood Receiver  (Read 1108 times)
W5KG
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Posts: 79




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« on: October 18, 2014, 05:34:06 PM »

I have a R-820 receiver that I am trying to get going and I was wondering if the 2.4 khz crystal filer is it the same as the TS820, YG88s?
Someone has replaced it with a 1.8 and I don't know what the original number of the 2.4 filter is.
Thanks for reading
Don, W5KG
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AC5UP
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Posts: 3893




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« Reply #1 on: October 18, 2014, 06:46:05 PM »

Pages 31 and 32 should answer your questions:   http://www.radiomanual.info/schemi/Kenwood_R820_user.pdf

Service manual here:  http://www.radiomanual.info/schemi/Kenwood_R820_serv.pdf

Note that a filter change requires adjustment of a DIP switch that programs the filter selector.  From what I can tell from the web you have a very good receiver that differs from the RX side of a TS-820 by the addition of a third IF below 455 KC's.  There isn't a buttload of info about the radio on the web but Google should return enough to keep you occupied for an hour or better.
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W5KG
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Posts: 79




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« Reply #2 on: October 18, 2014, 09:49:14 PM »

Those pages don't tell me anything. They are for the optional filters. I need to know what the original filter is. I know it is a 2.4kHz but I do not know the number. I want to put back original.
Don, W5KG
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AC5UP
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« Reply #3 on: October 18, 2014, 11:23:02 PM »

Parts list in the service manual shows the stock filter part number as L71-0204-05. Pacific Parts shows that number as discontinued. http://www.pacparts.com/part.cfm?part_no=L71-0204-05&mfg=Kenwood

No other details.
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WA8UEG
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Posts: 361




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« Reply #4 on: October 19, 2014, 08:43:22 AM »

That is a great receiver and can be hooked directly to a TS820 providing the same features as the Drake twins did. I had the combo for a number of years when I decided to sell the R820 on Ebay many years ago and it went for an absolute ridiculous amount,  Over a grand and that was at least 15 years ago. You are the first one I have seen to mention the R820, I believe they are indeed a rare find.
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W5KG
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Posts: 79




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« Reply #5 on: October 19, 2014, 10:10:53 AM »

Steve that is why I bought it. They are very rare. I bought it at a ham fest hoping  could fix it. I am going to pull the 1.8 and the 250 filters out and try to sell or trade them for a proper 2.4 filter. The receiver looks great. I just need to get it going. It receives but very weak and the 1.8 is too "tight".
Don, W5KG 
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WA8UEG
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« Reply #6 on: October 19, 2014, 11:10:53 AM »

Don't blame you, someone must have liked narrow filters!! 2.4 & 500 are more to my liking. Actually I have looked over the years and never found one, even at Dayton although a few years ago I saw a basket case one at Dayton (it literally was in a basket) and the basket was worth more then what was left of the R820.

Sounds like it won't be to difficult to get it back to 100 percent. Do you have a TS820? I would hate to guess what a very nice TS820 and R820 would go for today. I assume you will need to make the interconnecting cable but as I recall the info was in the R820 manual.
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W5KG
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Posts: 79




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« Reply #7 on: October 20, 2014, 02:43:25 PM »

I have repaired the R820. Bad solder joint. Receives better than any other Receiver I have owned. As good or better than my TS830s.  Still don't like the tight 1.8 ssb filter.
I will keep it a little while longer and make sure no other problems crops up, then I will sell it.
thanks for the help on the filter.
Don, W5KG
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WA8UEG
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« Reply #8 on: October 20, 2014, 03:14:24 PM »

I bet if you make up the interconnecting cable to hook up to the TS820 you will get an extra $100 (plug and play for todays ham). If I remember correctly it's the socket the remote VFO goes to but different wiring then the VFO820..
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N3QE
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Posts: 2287




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« Reply #9 on: October 20, 2014, 08:46:04 PM »

Inrad lists the R-820 filters same as TS-820 and sells a wide range. http://www.qth.com/inrad/TS-820.HTM
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