[Milsurplus] New Harris amp acquired

[Marty Reynolds]

>>  As just one example, it would be nice to know how much drive the
>> thing wants. Based on what I know of Harris exciters, I'm guessing
>> around 100mW. If that's the case, I wonder if it's possible to modify
>> it to accept a higher drive level...?
>



Hey Mike

It doesn't need a change, you just need a power divider between the
exciter & the amp.

Let's say both exciter out & amp in is 50R

Say you've got 100 ssb watts @ 50R.  First & biggest need is a common
dummy load. That means soaking 70v rms on cw.

100mw @ 50R rms is about 2.1v rms.  The voltage divider should be 35
times 50 ohms, IE about 2K non-inductive ohms.  Power is 70x70/2000,
about 2.5 watts.

Easily done,

Only comm'l power-divider I recall was for driving a Viking desk with
a 100w rig.  Hard to find but easily made gizmo

Or just run the Harris with a throttled-back K6 backpacker or a IC-703

Hope that helps

   Marty aka aa4rm