To the fellow boater with a question directed to be about a 706 shutdown issue... I could figure out how to respond just to you... the email
kept bouncing back as undeliverable. Hopefully you will see it here.
I have several 706s (car, two boats) and never had a situation of a full shutdown. There is a well known issue that I struggled with of very low xmit output (but the rig LCD never showed any signs of dimming) that might be related to your issue. My 706 never actually shut-off requiring use of the on/off button. But maybe your situation is a more severe manifestation of this known/ what I found... bad in-line fuse holders.
I had very long frustrating bout of very low output power HF & VHF
despite both antennas having good SWR and as I said, no LCD dimming sign of issues. This turned out to be caused by a warning I read years ago (and ignored) to get rid of/ upgrade the 706 in in-line fuse holders. Slightly dissimilar metals + high humid boat/ car environment
cause connection resistance. While cleaning
them with wire brush temporarily helped, within a week it was back to low power
again. If you are still using the original long 3A3G fuse/ holders with clip contacts I'd think it would be good to swap them out for 'prong' type fuses
that more aggressively self-wipe/ clean and fuse/ matting contact are metallurgically compatible. Automotive stores and marine
stores have this type of fuses/ holders.
So while this/ low voltage may or may not be causing your issue it's worth changing them regardless and checking out your complete power source lines. back to the battery
Some other rigs Yaesu 100D has had issues with cold solder joints on the final hybrids that require resoldering but never heard of 706 final issues.
If you are not using your face plate remotely and it's never been removed , it might be worth removing (side release and slide panel sideways) and wipe the delicate gold contacts with Kleenex (actually slightly abrasive). If these contacts developed moisture/ impurities over time it certainly could cause a shutdown, but I've never heard of 706 issues with it. But in remote
operation of 706s via Remote
Rig over the internet
, the 706 does shut down when the internet
path of the handshake between the panel and unit is interrupted. I've had my panels
on/ off several times and this action/ most contacts, switches, breakers, fuses
are designed to self wipe/ clean by contact surfaces moving against each other. Sitting stagnant longterm is usually not good.
I don't think your issue is SWR related, per se. I have more than once inadvertently xmitted without any antenna
on my 706s and never had a shutdown. But strapping your GT-15 directly to the lower ground part of your insulated shroud
could be coupling severe amounts of RF into your whole boat
ground system and maybe back to your rig. High RF around a rig can causes many unpredicted issues. I think it's worth temporarily separating the GT-15 / from the grounded section and/ or temporarily connecting it to a 10-20' wire pulled up by your halyard
to see if this changes your shutdown issue.
I'll ping around on your issue for other ideas/ maybe others have experience with 706 shutdown, but try these recommendations for now and let me know if it solves your issue. Bob, W3GAC
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