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Re: [Amps] SB-200 on WARC

To: <amps@contesting.com>
Subject: Re: [Amps] SB-200 on WARC
From: Thomas Tanbäck <tkteknik@telia.com>
Date: Wed, 23 Nov 2005 19:24:09 +0200
List-post: <mailto:amps@contesting.com>
Thank you all!
I have tuned up now on both 12 and 17, with no problem at all.
Full power and only minor input SWR.
Have not tried 30M but with 150W limitation there is no need.
73 de Tom
SM6VVT

----- Original Message ----- 
From: "Bob Nielsen" <nielsen@oz.net>
To: <amps@contesting.com>
Sent: Wednesday, November 23, 2005 7:33 PM
Subject: Re: [Amps] SB-200 on WARC


True, but in practice the amplifier appears to work pretty well on 17
m when set to 15 m and on 12 m when set to 10 m.  I tried tuning mine
on 30 m and was unsuccessful but with the 150 W power limitation on
that band (in the US) it didn't seem to matter.  I have not checked
the input impedance when used on 17 and 12 m, but the internal tuner
in my TS-570 handled it without any problems.

73,
Bob, N7XY

On Nov 23, 2005, at 9:21 AM, Jan Erik Holm wrote:

> The input networks are only for 10-15-20-40-80m bands.
>
> 73 Jim
> ---------
>
> Vic K2VCO wrote:
>> Thomas Tanbäck wrote:
>>
>>> Is it safe to tune up a Heath SB-200 on 30-17-12 M bands, in view
>>> of the HV
>>> rf choke?
>>> I assume the input bandpass filters is proper adjusted for this
>>> bands...
>>
>>
>> Possibly not on 17 M.  But in any case you can check this with a grid
>> dip meter.  Temporarily solder a jumper across the choke and then
>> (with
>> power off, of course) look for a resonance.  If it is within a MHz
>> or so
>> of the frequency at which you plan to operate, you may have a
>> problem.
>>
>> If you have an antenna analyzer you can accomplish the same thing by
>> disconnecting the plate side of the choke and (no jumper this time,
>> obviously) measuring the impedance of the choke.  Look for dips
>> indicating series resonances.
>>
>
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>

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