The Radio Shack HTA20 has the Ga Fet 3SK189. The bad news is if the Fet goes out you are screwed as they are impossible to find. Just find another working HTA20.
Last year (in the comments below) you mentioned that you used to have a TS-711. Did you buy it from Japan? I was researching the Japanese 711/811 versus the American versions, and by looking at the service manuals, it shows which boards are different and which are the same. I would assume one could simply swap out the boards that are different and be fine, but for what the Ebay parts sellers are charging for parts, it would be cheaper to just get the American version. I haven't dug into the schematics enough to see what is different between the boards though- could be just resistors or something that could easily be modified. Yep, I'm still looking for the 711/811 twins. I got kinda sidetracked when I came across the hard-to-find TS-670 (American) quad bander!
The 711 I had was the US version, so I can't speak to a conversion on that. Since the time I posted this video prices for Japan market radios have gone up considerably, making it almost not worth the effort unless a seller accepts a best offer.
Two things, first off, you can just cut the diode no need to move it. You are just risking damage because secondly, this board has CMOS components and if you are not taking precautions (grounding yourself and the board) you can cause damage.
The US version had diodes in those two spots which is why I moved it. Risk of damage from heat from soldering is negated with experience. At my workbench there's no risk of static shock damaging anything, but depending on your bench, YMMV.
I've been searching all day about converting the TR-751 and 851, as well as the TS-790. I've had no luck except for this video on the TS-790. Would you happen to know anything on the other two radios?
Not offhand, but interestingly enough the Japanese sellers on eBay have lately been fairly sketchy. The seller that I bought my radios from is no longer a registered user, and if you watch a certain radio carefully many times the exact same radio with the same pictures gets listed by two different sellers at two different prices. Last week I had this happen with a Yaesu FT-225D. Seller I bought from said that the radio was damaged and refunded me. The other seller 3 days later canceled his auction. I don't know if these radios are available at a shop and multiple people are listing them or what, but something weird is definitely going on.
@@timpoliniak7361 Yeah, I didn't find the seller you mentioned (now I know why), but a couple of the other sellers had decent enough feedback. I also ran across the TS-711 and 811 twins- they are closer in size to my TS-430S, rather than the more mobile size of the TR-751 and 851. Unfortunately, it seems the only way to get a TS-790 is through Japan like you did- I can't find an American seller on any site.
@@TheREALJosephTurner I had the TS-711, really nice radio. Sold it when I got the 790. The reason I got the 790 primarily is that it matches the TS-940 I have! Funny how that works.... I hang out on 652 simplex locally all day and NCS a traffic net once a week, so either radio is a lot more than I need. Just don't buy a TS-700 series, it'll drive you nuts to use on repeaters and it took about $80 in mica caps in the VFO to get it to sort of stop drifting. There's no shortage of 790's on eBay out of Japan, but converting them is a gamble and I got lucky. The prices on them are too high, and I don't think any of them are selling.
Interesting! I’d been digging around for a while trying to find something to match my TS-940S as well, and happened to settle on the 790. In the process of bringing one over from Japan as well, so hopefully your video here is just what I need!
Well, with what those things cost and being a current production model unless you're sure that the transmit is opened up I probably wouldn't risk it. I just bought a Yaesu FT-900 from Japan which is HF only, and no modding needed.....but as they say your mileage may vary.
The Radio Shack HTA20 has the Ga Fet 3SK189. The bad news is if the Fet goes out you are screwed as they are impossible to find. Just find another working HTA20.
Last year (in the comments below) you mentioned that you used to have a TS-711. Did you buy it from Japan? I was researching the Japanese 711/811 versus the American versions, and by looking at the service manuals, it shows which boards are different and which are the same. I would assume one could simply swap out the boards that are different and be fine, but for what the Ebay parts sellers are charging for parts, it would be cheaper to just get the American version. I haven't dug into the schematics enough to see what is different between the boards though- could be just resistors or something that could easily be modified. Yep, I'm still looking for the 711/811 twins. I got kinda sidetracked when I came across the hard-to-find TS-670 (American) quad bander!
The 711 I had was the US version, so I can't speak to a conversion on that. Since the time I posted this video prices for Japan market radios have gone up considerably, making it almost not worth the effort unless a seller accepts a best offer.
Two things, first off, you can just cut the diode no need to move it. You are just risking damage because secondly, this board has CMOS components and if you are not taking precautions (grounding yourself and the board) you can cause damage.
The US version had diodes in those two spots which is why I moved it. Risk of damage from heat from soldering is negated with experience. At my workbench there's no risk of static shock damaging anything, but depending on your bench, YMMV.
I've been searching all day about converting the TR-751 and 851, as well as the TS-790. I've had no luck except for this video on the TS-790. Would you happen to know anything on the other two radios?
Not offhand, but interestingly enough the Japanese sellers on eBay have lately been fairly sketchy. The seller that I bought my radios from is no longer a registered user, and if you watch a certain radio carefully many times the exact same radio with the same pictures gets listed by two different sellers at two different prices.
Last week I had this happen with a Yaesu FT-225D. Seller I bought from said that the radio was damaged and refunded me. The other seller 3 days later canceled his auction. I don't know if these radios are available at a shop and multiple people are listing them or what, but something weird is definitely going on.
@@timpoliniak7361 Yeah, I didn't find the seller you mentioned (now I know why), but a couple of the other sellers had decent enough feedback. I also ran across the TS-711 and 811 twins- they are closer in size to my TS-430S, rather than the more mobile size of the TR-751 and 851. Unfortunately, it seems the only way to get a TS-790 is through Japan like you did- I can't find an American seller on any site.
@@TheREALJosephTurner I had the TS-711, really nice radio. Sold it when I got the 790. The reason I got the 790 primarily is that it matches the TS-940 I have! Funny how that works....
I hang out on 652 simplex locally all day and NCS a traffic net once a week, so either radio is a lot more than I need. Just don't buy a TS-700 series, it'll drive you nuts to use on repeaters and it took about $80 in mica caps in the VFO to get it to sort of stop drifting.
There's no shortage of 790's on eBay out of Japan, but converting them is a gamble and I got lucky. The prices on them are too high, and I don't think any of them are selling.
Interesting! I’d been digging around for a while trying to find something to match my TS-940S as well, and happened to settle on the 790. In the process of bringing one over from Japan as well, so hopefully your video here is just what I need!
@@KyleRodgers PLEASE keep us updated on how it goes!
How about the Kenwood ts-890? If I buy one from Japan, will it work here in the US?
Well, with what those things cost and being a current production model unless you're sure that the transmit is opened up I probably wouldn't risk it. I just bought a Yaesu FT-900 from Japan which is HF only, and no modding needed.....but as they say your mileage may vary.
*KENWOOD (MOST I HAVE SEEN) .. DIODE CUT IS THE "EASY THING" ...*
*IS NOT TO BELIEVE **#WHAT** SOME "DIODES" .. CAN DO*