[Amps] SB-200 on WARC

[Bob Nielsen]

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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