From: [email protected] [mailto:[email protected]] On Behalf Of Richard via groups.io
Sent: Sunday, September 04, 2022 9:35 PM
To: [email protected]
Subject: Re: [YaesuFT847] UHF Range: Partial RX/TX Issue.

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Bill K2WH-> Hi Bill, I only just discovered the inability to enable the Alaska emergency frequency during a complete functionality check of the radio.? I went thru all the settings to see what was & what wasn't working on my radio.? I needed a full picture of what the radio could & couldn't do.? But yeah, I have no need for it.

Andrew-> I'm unsure about actual power out as I have no way of measuring VHF & UHF at the moment.? I've been looking at some cross needle SWR/PWR meters for those bands but haven't made a decision on which one to get.? I did get a neighbour to walk down the street to a park about 200m away with an FRS radio and he reports full quieting on minimum power.

I followed your link and sure enough it's been opened up.? I'm not too impressed, I? actually said "oh, bloody hell" as I specifically asked about this and the seller assured me it was untouched.? Oh well.? I'll be restoring it back to factory original.? Looks like all I have to do is remove the solder-shorts on pads #2 and #3 and put a chip resistor back on pad #6.

I feel like an idiot as I've had the radio this long and never noticed it could go out of band.? Never had a need to so I never tried.? Heh.

Spence M0STO -> I had the same thought about the relays.? I had my ear to the radio case listening for the tell-tale "click" as I tuned up & out of a BPF and into the next one.? I heard none.? That's when I had the thought that i'd need to look in this area.? Ah-ha!? look at that, "420 - 460 MHZ" circled in red on that schematic snapshot.? Dead-on the problem i'm having.? Thank-you for narrowing it down for me.

I do plan to replace the HF BPF diodes with low noise Schottky type as explained here:?

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Examining the bottom board, I did see left of X1001 a soldering job that looked non-original and there was still a bit of flux around it.