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Where did you get that powerpole?? Sounds like a real improvement over those "coaxial" connectors.

Thanks & 73,

Jim

wb4gcs@...

I cannot use one of these on my rig. A year ago a chip cap on the pc board power line by the power jack blew up and wiped out the trace. I believe it was a 0.1 uF, 16V cap. 16 volts seems dicey on a 13.8 volt line, Anyway, I repaired the trace but it weakened the mount for the DC jack.? It wobbles a little. So I had to get one of the Powerpole plugs that mounts with a screw onto the radio. It is very stable. I have not had problems with it.

73, Zack W9SZ

On Fri, Nov 11, 2022 at 7:56 AM Randy.AB9GO <randy.ab9go@...> wrote:

Here is the exact replacement from Amazon.? I have purchased two over the years and they both work fine.? Somehow I misplaced the first one so that's why I bought two.??

randy.ab9go@...


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Thanks,

Randy.

randy.ab9go@...

Here is the exact replacement from Amazon.? I have purchased two over the years and they both work fine.? Somehow I misplaced the first one so that's why I bought two.??

randy.ab9go@...


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First of all I would like to thank everyone for their feedback and suggestions. It has been very helpful.

The signal is real, and it is coming in the antenna on the 705. I used the RF Gain and ATT on the 705 (with the preamp off, thanks!) to get the received signal down in a useful range, then I compare with and without the BLP-300+ LPF on the 817 and it is definitely having an effect on the spur. That's good. For evaluation purposes I also put the LPF on the input of the 705 and it knocks it down almost completely, which is another good sign (filter working, RF coming in the front door). I am going to set up for a mock sat pass and see how it plays, but I feel a lot better about the situation. As I said (I think) it hasn't stopped me from working V/U mode into RS-44, but it is annoying. I have a BLP-200+ coming and that should be an upgrade.?

This rig is the fourth FT-817 unit I have owned, and it has been about 5 years since my last one. I had forgotten what a fun rig it is!?

72, Pete N1QDQ

Hello everybody
I joined the group just a few days ago after a good friend of mine handed over a FT817 as a gift.
I would appreciate if someone on the group could advice if the case type and pinout of the Collins mechanical filter 526-8693-010 (the one recommended by Inrad to match their 705 pcb) is the same of that of reference 526-8686-030 (the one of the YF-122C under reference XF-115C). I have located a XF-115C but before buying it I would like to be sure that it will match the Inrad pcb. I am very sorry but I have been unable to find this information in the web and even in te list of Collins mechanical filters provided by a good friend.

Many thanks in advance for your assustance and help.

72/73 de Vicen?, EA3ADV

Glenn, Thanks for the assistance. I just tried that again to make sure I was covering my bases and with the 817 transmitting a tone in FM at 1/2 watt I can walk around the house with the 705 and a rubber duck and the 437 signal stays strong. Not as strong as when they are in the bag together, but what you would expect in "walkie talkie" mode.

73 Pete N1QDQ

Hi Al,
Thanks for the feedback, and I get that, but the issue seems too consistent. I can transmit into an antenna or dummy load, 1/2 watt or 5 watt, and it still happens. I can tune the 2M side up and the 70cm product goes up with it. Also, I don't have any local source like that. It's actually pretty quiet here. I use an SDR on a attic dipole and I don't have interference issues with that. But your point about how a 2M LPF isn't knocking it down is well taken. Could it be coming from the 817 mixer?

Here is a pic of the 817 in transmit and and the display on the 705. Both rigs in FM. 817 fed with sine wave audio and triggering the VOX.



Pete N1QDQ

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You are in the near field and possibly picking up radiation from within the radio.
What does the harmonic look like in the far field?

73
Glenn
WB4UIV

I might have transcribed those number incorrectly. I took some notes and had to leave the project for a few hours. I just got back home and put it on the bench, into a good dummy load, and used my IC705 as the test receiver. Transmitting on 145.950, seeing a clear signal on 437.850 (the calculated third harmonic). Put in a Micro-Circuits BLP-300+ which should have -30dB attenuation at 450MHZ and not much of a difference at all. Certainly not 30dB. I'll keep working on it. Thanks for the reply. N1QDQ

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Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
Amateur Callsign:  WB4UIV            wb4uiv@...    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI, FRA, NRA-LM    ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"

N1QDQ, when you are seeing interference that is not a harmonic and is not attenuated by a low pass filter at the transmitter, then the interference is outside of the radio and is likely a mixing product with something else.? The difference is around 300 MHz which could be a local military installation or it could be a sub harmonic of a UHF TV station near you.
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Al Skierkiewicz
WB9UVJ

I might have transcribed those number incorrectly. I took some notes and had to leave the project for a few hours. I just got back home and put it on the bench, into a good dummy load, and used my IC705 as the test receiver. Transmitting on 145.950, seeing a clear signal on 437.850 (the calculated third harmonic). Put in a Micro-Circuits BLP-300+ which should have -30dB attenuation at 450MHZ and not much of a difference at all. Certainly not 30dB. I'll keep working on it. Thanks for the reply. N1QDQ