[Top] [All Lists]

Re: [TenTec] Ten-Tec amplifier vacuum relay noise

To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>,"ken.d.brown@hawaiiantel.net" <ken.d.brown@hawaiiantel.net>
Subject: Re: [TenTec] Ten-Tec amplifier vacuum relay noise
From: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Fri, 07 Dec 2007 14:44:07 -0800
List-post: <mailto:tentec@contesting.com>
The voltage difference is simply a different coil -- higher voltage, less 
current. I agree the mounting method contributes to the noise. But it 
doesn't bother me -- I wear headphones. :)

Note that a company called Gigavac makes and sells their own versions of 
these relays to hams at a nice discount. google to find them. I've bought 
several for Titans and Herc II, and installed several. None have been 
installed long enough to be considered a test of reliability, but none 
have failed yet either. I work 99% CW (except SSB for some contests) and 
ALWAYS QSK. I'll typically do >500 Q's in a contest weekend. 


Jim K9YC

On Fri, 07 Dec 2007 12:11:25 -1000, Ken Brown wrote:

>I have a Titan 425 and a Hercules II 420 amplifier. The vacuum relays in 
>the two amplifiers appear to be the same model. The vacuum relay in the 
>425 makes much more noise. I know it uses a higher voltage to actuate it 
>that the 420 does, 20 V versus 13 V. That may be part of the difference 
>in noise. I am wondering if differences in the mounting of the relays 
>and the stiffness of the wires connected to the relay is also an 
>important factor in the amount of noise radiated (acoustically) from the 
>relay. I am considering replacing the grommets that the relay board is 
>mounted with, and adding short lengths or braid in the connections to 
>the relay (not stiffened by being totally soaked full of solder) to help 
>isolate the relay vibration from the rest of the chassis.

>Anyone out there tried any of this already? I'd be interested to hear 
>about your successes and/or failures.


>TenTec mailing list

TenTec mailing list

<Prev in Thread] Current Thread [Next in Thread>