[Premium-Rx] Harris 110A 1 kwatt rf Amplifier question

[Steve Sykes]

This looks very nice Dave.  I haven't run my amp in quite awhile, but 
since getting an RF-1310A I will be getting it going.  Since my shack is 
small, this silencer will help quite a bit.  I will let you know.

73,
Steve KD2OM

On 02/12/2011 10:26 AM, Dave Robinson wrote:
> Hi Steve,
> Been there, done that.   No use reinventing the wheel.   See attached.
>
> -----Original Message----- From: Steve Sykes Sent: Friday, February 
> 11, 2011 8:49 PM To: premium-rx at mailman.qth.net Subject: Re: 
> [Premium-Rx] Harris 110A 1 kwatt rf Amplifier question
> The RF-110 amplifier usually comes with a baffle similar to what 
> Berndt has installed to reduce the fan noise. These amplifiers are not 
> designed to be in the same room as the operator so the fan noise was 
> not usually an issue.  The only way to get the air flow required in 
> the space allowed was to use a 400 Hz fan. As one list member stated 
> the bearing could be noisy, they are high quality parts but who knows 
> how long they have been running.  Another thing to watch for on these 
> amplifiers is the sound deadening foam on the inner surfaces air 
> passages gets dried out and little bits of it end up in the cooling 
> fins of the tubes causing them to overheat. You need to inspect the 
> tubes and the air passages every once in awhile.
> I would not try to change the fan for a quieter one.  It has been 
> tried, even at Harris, but there usually problems.
>
> 73
> Steve KD2OM
>
> On 02/11/2011 01:30 AM, Blair Batty wrote:
>> Gentlemen:
>>
>> I have a Harris 590 receiver.  I know a few of you have
>> built premium Harris systems, using the 110a amplifier.
>>
>> Because I live in an apartment, I use the Harris 590 receiver
>> and planned for a remote transmitter.  I eBayed a Harris, 1 kwatt,
>> transceiver, mounted in a standard 6' rack (surplus USA
>> Airbase). I also ebayed the remote control for it.
>>
>> RF-270-5A Transceiver, 1 kiloWatt SSB, CW, AM consisting of:
>>       *  RF 2305 receiver/exciter,
>>       * with all the cables and interface boxes.
>>       * Harris RF551a Preselector
>>       * Harris 110a Power Amplifier and power supply
>>       * Harris 7401 remote control
>>
>> My rural friend let me install it in his shack, (for providing
>> the site,  my friend gets local use of it). When I'll want to use
>> it remotely, I'll phone and tell him to throw on the
>> master power switch.
>>
>> The remote control give complete control of the transceiver;
>> frequency, mode, etc. It communicates via rs232, or with
>> the builtin modems over phone lines. We will use rs232 to
>> TCP/IP adaptors. I have a static ip. For audio, we'll probably
>> use a uhf link.
>>
>> So far, we have the receiver/exciter working, and the Power
>> Amplifier and have talked all over North America with it
>> on 80 meters. We have an issue to fix in the Harris RF551a
>> Preselector. Then will get the remote control working.
>>
>> My Question: Does anyone have any experiance quieting down
>> the fan in the Harris 110a Power Amplifier? I seem to remember
>> someone warning not to fool with it, or I'll melt the tubes...
>>
>> Sincerely
>> /blair
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