[Amps] HF AMP Issues questions

Jim W7RY w7ry at inbox.com
Sun Sep 19 13:42:07 PDT 2010


BUT you can only see the real output power if you have a peak reading 
wattmeter. If you have one, your good. If you don't you cannot read the real 
power output of the amplifier.

73
Jim W7RY


--------------------------------------------------
From: "Robert Morris" <robrk at nidhog.net>
Sent: Sunday, September 19, 2010 10:27 AM
To: "Randy S." <rj3819 at yahoo.com>
Cc: <amps at contesting.com>
Subject: Re: [Amps] HF AMP Issues questions

> On 9/19/10 12:19 PM, Randy S. wrote:
>> Hi again,
>>     Powered up the amp .. filaments light .. blower works .. timer 
>> circuits for
>> HV and Blower work.
>> Having trouble tuning it  ..
>> Vacuum caps for plate and loading.
>> Have loading cap at minimum. Evidenced by the plates in the vacuum cap 
>> moving
>> away from each other.
>
>
> Did you move the load cap?
>
> Put radio on cw, 50 watts out, send 20wpm dots and tune for max out using 
> both caps.
>
> With cw dots you are "pulse" tuning at 30% duty.
>
> Reverse design it. Measure the coil and tap placement, the caps should be 
> marked
> with values or part number. (USC500). Look up cap specs. Use the counter 
> dials
> to figure cap value per band and look at charts in handbook for a semi 
> guess
> setting for each band.
>
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