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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