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Squeel and intermittent loss of audio v5

Maurice Bersan
 

Just a heads up if you have a v5 board and are using the universal case with the extra accessory board. The one with Ptt audio and CW jack's mounted on the front panel. I noticed with mine that occasionally when I plugged the mike in I would loose audio and had a loud squeel when I turned the volume down. Problem went away when I removed the mike.. after about an hour of head scratching I found the underside of the accessory board would come in contact with the threaded riser beneath it....the one on the volume pot side of the lower case, which is used to secure the front case stand. Just a minute amount of flexing of the front panel would set it off. I ended up grinding off about 1/32 off the riser for clearance.
Cheers

Maurice.   Vk6hly

Joel Trenalone
 

Greetings all,
Same here. I assembled my UBITx about 6 months ago into the amateurradiokits.com (Sunil) and had to grind off the screw hole bumps on the bottom of the case, took me a while to figure out why the audio kept quitting. 

Otherwise a great enclosure for a great price :)

_Dave_ K0MBT
 

I have a similar case on a v4. The bottom front board mounts too close to the bottom and with flex can touch the bottom of the case. I tried adding kapton tape and trimmed the solder points pretty flat. It worked for a while then started back up. It is pretty much a design fault. The parts move more than you would expect. Just needs another 1/4" of clearance. My solution was put a thin layer of plastic under the board. Something like the side of a plastic container. 

When I built the next radio I used a larger case and moved the jacks to the side away from the case floor. I have had this radio for almost a year. 

I purchased the radio with the intermittent shorting used  It was not working because of a bad audio connector and some other issues. Mainly the shorting only occurs when handing the cords. I had not read much about the problem and figured my issue was fairly isolated. 
Dave
k0mbt
Raduino bracket and Ham_Made_Keys

Philip
 

Same here

KG5MG
 

Good to know. I just started assembling my uBitx and will be putting it into the Amatuer Radio Kits enclosure.



Hamp Yearwood
KG5MG 

-------- Original message --------
From: Philip <philip.g7jur@...>
Date: 11/17/19 5:54 PM (GMT-06:00)
To: BITX20@groups.io
Subject: Re: [BITX20] Squeel and intermittent loss of audio v5

Same here

howard winwood G4GPF
 

This should not be a problem as the kit of parts that comes with the case has extra long stand offs for the main board.
DO NOT use the ones that come with the circuit board, only use those with your own case/box.
G4GP

Maurice Bersan
 

Howard, the problem is not the main board, it's the smaller accessory board. For it to fit correctly it must line up with the three pre drilled holes in the front panel so it can't be raised.
Maurice

howard winwood G4GPF
 

Ok. Thanks, must have been lucky with mine. Will go and check though as I have put another jack socket under the existing key jack wired for a paddle,
For those that have the problem, perhaps a little hot melt glue might do the trick.
It doesn't appear to affect most people though.

On Mon, 18 Nov 2019, 04:42 Maurice Bersan via Groups.Io, <Vk6hly=yahoo.com@groups.io> wrote:
Howard, the problem is not the main board, it's the smaller accessory board. For it to fit correctly it must line up with the three pre drilled holes in the front panel so it can't be raised.
Maurice