[TenTec] OMNI VII QSK users with good ears....

[Stuart Rohre]

A number of methods might quieten a noisy relay.

You might have to do some detective work to find out if the relay closing is 
being mechanically amplified by the chassis or panel upon which it mounts.

Relays that have a bracket held to its surface by screws might use rubber 
grommets for isolation of the screws from the relay frame, and the frame 
from the chassis surface.

Other ideas are to mount a rubber pad onto the chassis and then mount the 
relay to the pad.  The stiffness of the rubber has to be experimentally 
determined to be of enough isolation to reduce the audio sound of the relay 
closing.  Industrial rubber used for gaskets might make a suitable material.

In a like manner, noisy fans on rigs have been quieted by use of rubber 
grommets, or gaskets upon which to remount the fan.

-Stuart
K5KVH
----- Original Message ----- 
From: "veast1" <veast1 at charter.net>
To: <tentec at contesting.com>
Sent: Tuesday, December 11, 2007 4:31 PM
Subject: Re: [TenTec] OMNI VII QSK users with good ears....


> Well, i have a Heath HA-14 and i have an isolation relay between the rig
> and the amplifier.  The relay in the amplifier is quite noisy, however
> when i'm not using the amp, the relay in the rig seems to be quite loud.
> Since i have the isolation relay at the power supply to the amplifier, i
> was thinking of maybe using a 4N33 optoisolator to replace the relay in
> the rig, but was thinking that maybe someone else has come up with
> something better.  I have no problems working inside the rig.  I have
> done the INRAD SSB audio mod. utilizing surface mount components and
> added the roofing filter mod. with my own switching modification
> utilizing the ATTN button and associated LED.
>
> Thank you for any help and for your response.
>
> 73 - Paul (N6MYA)
>
>
>> >As i happen to have an OMNI VI+, i would sure appreciate a point in the
>> >correct direction for a replacement to the noisy amp relay.
>> >Thank - you.
>>
>> Tell us a bit more about the type of amp you're trying to interface and 
>> your
>> level of comfort with soldering/de-soldering a couple components inside 
>> the
>> rig.  I can guide you through this, but you'll need to open the rig and 
>> make
>> a few minor changes -- all reversible if you later sell it.
>>
>> Paul, W9AC
>>
>>
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