[TenTec] Power output question....omni c

[Bob McGraw]

The typical power spec is +/-1 dB.   That means anywhere from 80 to 125 
watts is within spec.  10log(P1/P2) = DB

   Then add the +/-10% accuracy of the typical ham power meter and you 
have ????????  But I'd say close to 100 watts on all bands is also typical.

Another factor to watch is current in amps while in transmit, CW mode, 
key closed.  Again typical of a 100 watt radio is 18 to 22 amps.  If the 
bias is not correct for the transistors you replaced then the output can 
be affected.

73

Bob, K4TAX


On 2/7/2021 11:23 AM, Carl Moreschi wrote:
> What is the voltage inside the radio after the power connector?  It 
> may be a volt or 2 lower if the connection is not a good one.  And 
> these voltage need to be measure while transmitting full power.
>
> Carl Moreschi N4PY
> 127 River Moss Way
> Hertford, NC 27944
> www.n4py.com
>
> On 2/7/2021 12:12 PM, Scott Sheppard wrote:
>> Hello everyone
>>
>> I have been going thru the omni c over the past several days getting 
>> it back in shape. It’s running well and my last remaining challenge 
>> was the power output.
>>
>> On most bands I was getting under 50w so figured I may have had a 
>> blown final.
>>
>> Out came the mrf458’s (intact) and replaced with PT9784’s I had on 
>> hand...not a lot of difference. I then swapped out the pt3647 devices 
>> also located in the final PA with a pair of 2sc2166’s.
>>
>> I realize the power output specs vary to some degree and have a bit 
>> of range, and normallly higher freq will be a bit less.... but I am 
>> curious why 40m is now my lowest output...with 13.8 v measured at the 
>> radio this is the result:
>>
>> 160.  65
>>
>> 80.    85
>>
>> 40.    75
>>
>> 30.     80
>>
>> 20.     95
>>
>> 15.      80
>>
>> 28.     65
>>
>> Any thoughts why 40 is the lowest band?
>>
>> Greetings from Yukon Territory,
>> Scott.  Vy1co
>>
>>
>> Sent from my iPad
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