[Drake] TR-4C power output on 10m?

[Singley, Rodger]

Dave,

The power will drop off on 10 on most of the vintage tube gear but it
should not be that drastic.  I would expect 200 watts or a bit more on
80 through 20 dropping to around 150-175 out on 15 and 10 meters.  I
notice a little greater percentage power loss on 10 meters with my TR-4
compared to my various T-4X transmitters; this may be the particular
tube set in the TR-4 or perhaps an artifact of the greater output
capacitance of 3 sweep tubes instead of 2.  But in any case 80 watts is
definitely far outside the norm. 

Are you using a dummy load (or a good matched 50 ohm antenna) during
these measurements?  Where is the loading control on 10 meters? If it
doesn't end up well clockwise then I suspect you don't have enough drive
on 10 meters and this is probably an alignment issue since it apparently
works OK on lower bands.

I am not a big fan of peak reading watt meters and I much prefer using
one of my Tektronix lab scopes for this type of measurement.  The PEP
output on SSB of the 4 line gear should be equal to or slightly greater
than the CW output.

Rodger WQ9E

> -----Original Message-----
> From: drake-bounces at mailman.qth.net [mailto:drake-
> bounces at mailman.qth.net] On Behalf Of David Walker
> Sent: Monday, December 14, 2009 3:41 AM
> To: drake at mailman.qth.net
> Subject: [Drake] TR-4C power output on 10m?
> 
> Hi folks,
> 
> I have a Drake TR-4C.  The 10m band was not working so I used deoxit
to
> clean the band switches and it seems to be working again.  I have only
> had this radio for 12 months or so.   What is the power output I
should
> expect on 10m?
> 
> I tune up with about 80w max and it puts out about 40w PEP and I have
> to
> use a fair bit of drive.  On the lower bands it tunes up to 200w and
on
> SSB it puts out about 80w PEP.  Is that about right for this radio?
> 
> Cheers,
> 
> Dave
> VK2NA
> Newcastle, Australia
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