sb220 qeustions

[Brian Carling]

On 14 Oct 97 at 15:55, Mike wrote:


> Hi. Name's Mike, N9IVO.
>
> I recently bought an SB220 amp from a friend. He got it from an estate sale and
> had never used it. Anyway, it seems to work very well. Being my first amp, and
> also my first Heathkit, I have a couple of questions.
>
> The amp tunes well on my Cushcraft R5 on 17 meters on the 15 meter position.
> Will this damage the amp? I know that when the amp was built, we didn't have
> the WARC bands yet.

No - that shouldn't hurt anything. I have used linear amplifiers on a
band that was "close" to the original one they were intended for
before now with success. I used a LK-500Z that was built pre-WARC
and I put it in the 7 MHz position but tuned it up on 30 meters and
it worked OK for me.

> Is there a kit or mod to gain 160 meter ability from the amp? 160 is a tough
> band
> to use barefoot, especially in the summer months!

You are right. People HAVE modded the SB-200 and SB-220 for 160m.
I don't have the details.

However you could try the many links listed at:

http://www.mnsinc.com/bry/hamlynx/hammods.htm

That would be one good starting place in your search.

 > The ALC circuit doesn't seem to match the voltage expected from my
Kenwood
> ts440s.
> The amp's alc circuit is cutting the ts440's power to about half no matter what
> mode or drive I use. Without the alc hooked up, it works perfectly. Any Ideas??

Disconnect the ALC line!!!
I have done the same with other rigs and so long as you don't
massively overdrive the amplifier it will sound fine.

It's better to limit your drive, unless you can put some control or
voltage divider network on that ALC line.

73 - Bry, AF4K

****************************************************
*** 73 from Radio AF4K/G3XLQ Gaithersburg, MD USA  *
**  E-mail to:  bry at mnsinc.com                     *
*** ICQ: 3910641  ***
**  http://www.mnsinc.com/bry/                     *
****************************************************
AM International #1024, TENTEN #13582. GRID FM19. Using a SWAN 250 on 6m,
Other rigs: Valiant, DX-60/HG-10, FT-840, TM-261, Ameco TX-62, Gonset Communicator III
HTX-202...TEN-TEN #13582, DXCC #17,763 Bicentennial WAS

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