[TenTec] Scout 555 - no output

[MadScientist]

I assume it works OK on receive…

The Scout is a pretty simple radio to follow. Your first step is to determine if there is significant RF at the input to the final amplifier.

It should be significant because, unlike many radio design, the driver for the final is not in the final amp module.

If you have an oscilloscope, it would be very useful for this.

Otherwise you can make an RF probe for a voltmeter using directions you can find via Google.

If you do have strong RF at this location, likely your MRF455 outputs are bad.

Gary

W0DVN

> On Dec 7, 2018, at 12:06 PM, Steve Sutfin <stephoto at mind.net> wrote:
> 
> 
> On Dec 4, 2018, at 9:00 AM, tentec-request at contesting.com wrote:
>> 
>> Today's Topics:
>> 
>>   1. Scout 555 - no output (Michael Fishman)
>> 
>> 
>> ----------------------------------------------------------------------
>> 
>> Message: 1
>> Date: Tue, 4 Dec 2018 09:57:49 -0500
>> From: Michael Fishman <spikefish at gmail.com>
>> To: tentec at contesting.com
>> Subject: [TenTec] Scout 555 - no output
>> Message-ID: <97125011.20181204095749 at gmail.com>
>> Content-Type: text/plain; charset=utf-8
>> 
>> Hey all - new guy with little electronics xp hoping to find a solution for a Scout that won't tx. Happened suddenly - simply no output out of the blue. Have tried multiple power sources, antennas and band modules - same across the board.
>> Read something about bypassing finals to narrow down possible issues, but instructions weren't very clear to someone who is new to hardware issue diagnosis.
>> 
>> Any ideas welcome!
>> 
>> Very 73, Mike NK8S
>> 
>> Nasty Kharybdis 8 Sailors
>> FISTS #17907 NAQCC #8554 SKCC #15862T?
>> ZUT!
>> 
>> 
>> Mike,
> 
> 
> Were you transmitting when the power dropped; if so what mode? If CW were you using the internal keyer? Or did you just have no power when you turned it on? Any chance of reverse polarity with original PS. There is a reverse polarity diode that might have popped. Just fishing.
> Steve k7dna
> 
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