Those who convert SB220's to single-band 6m operation are often a source
of the needed parts.
73,
Dave, AA6YQ
-----Original Message-----
From: amps-admin@contesting.com [mailto:amps-admin@contesting.com] On
Behalf Of W0YR@aol.com
Sent: Wednesday, May 08, 2002 2:47 AM
To: kg7da@foxinternet.net; amps@contesting.com
Subject: Re: [Amps] Adding 10 meters to a SB-221?
Hi Marty,
I, too, have an SB-221 which is still "cherry."
First, you'll have to take out a trap in the input circuit which will
not
pass anything above about 25 mhZ.
A second problem is that there are not enough positions on the band
switch,
but if you're willing to skip 15 meters, you can make out. If you
really
watch for them, sometimes band switches can be found, or another with 5
positions can be subsituted.
The third problem is the input matching network and you'll have to start
from
scratch on that. Also, you have to change the input band switch.
Fourth, you'll have to find or make a 10M inductor, though that should
not be
a big problem.
All in all, it's just a big mess and you will pretty much ruin the
re-sale
value of the amplifier. That's why I haven't dove (or diven? HI) into
the
project.
If you do, please share your results with the rest of us trepidacious
221
owners.
73
Mike
WØYR/4
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