SB-220

[Mark Graalman WB8JKR]

  You could IF: you tune the amp to full power out
(1000 watts) and then set the carrier level on the
exciter to produce 200-250 watts out on the amp.
 But don't think I'd suggest it unless your sure your
transmission time wouldn't exceed more than a
couple of minutes, the limiting thing is the power
supply in the amp.
 You just have to remember that PEP on a 100%
modulated AM signal is four times carrier, so if
the amp will run a linear 1000 watts output, you
set the carrier level for 250 watts unmodulated.
 With the rigs you mention, the SLIGHT increase
in average power wouldn't be worth the amp, you're
only talking about 3 dB.

Mark  WB8JKR


On Thu, 23 Sep 2004 11:15:13 -0500 lgrindel <lgrindel at MAIL.EV1.NET>
writes:
> Greetings Guys,
>   I was wondering if anyone in the group has any experience or
> advice on using an SB-220 amp for AM operation. I have heard it is
> o.k. if you keep the drive down, so you are only putting out 200
> or 300 watts. I am using a DX-100B, and soon an Apache. Any help
> or advise will be appreciated, those tubes are way too expensive
> to do something stupid. Thanks in advance
> 73
> Larry Grindel  KD5ECG
>

-----------------------------------------------------------
Products bought, sold or traded here is the responsibility of the
parties involved.  This list and the City of Tempe are not responsible
for losses or misrepresentations of any kind.  Buyer beware!

-----------------------------------------------------------
This list is a public service of the City of Tempe, Arizona
-----------------------------------------------------------

Subscription control - http://www.tempe.gov/lists/control.asp?list=HEATH
To post - HEATH at LISTSERV.TEMPE.GOV
Archives - http://interactive.tempe.gov/archives/HEATH.html