If it's any interest, I found a Nelson-Ross TTG-29 Two-Tone Generator. I
need to check
it out, but I think it works. Getting a manual for it may be a problem.
But, it looks like it will do the job.
73, Dick, W1KSZ
On Sun, Nov 3, 2013 at 9:05 AM, Jim Barber <audioguy@q.com> wrote:
> On 11/3/2013 6:53 AM, Colin Lamb wrote:
>
>>
>> A similar linearity-detecting scheme was used in a 3-1000Z design from
>> the 1970 ARRL Handbook. "The SS-70 2-KW Amplifier", pp 204-208.
>>
>> It used diode RF detectors in the cathode and plate circuits, a
>> "balance" pot and a 50-0-50 uA front-panel meter.
>>
>> I have no idea how well it worked, but this thread rang a bell and I had
>> to go look it up. It would be interesting to try it. If the mechanical
>> meter turned out to be inadequate, a connector for an external scope
>> could be added.
>>
>> 73,
>> Jim N7CXI
>>
>> Instead of using a meter, an led array should work fine, since the led
>> has much faster response. If you rectified the input and output of an amp
>> and fed to companion led arrays, you could do the same thing as the scope.
>> In fact, they have solid state scopes that would work well and occupy
>> almost no space.
>>
>> 73, Colin K7FM
>>
>>
> The old National app note for the LM3914 bar graph driver shows a
> 20-segment zero-center meter that drives with a +,- 5V signal. Clamping
> zeners on the detector outputs and an op-amp for buffering would make a fun
> display.
>
> The HAL-8877 ? ;-)
>
> 73,
> Jim N7CXI
>
>
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