[AMRadio] Ranger... good news, bad news


Jack Schmidling jack at schmidling.com
Sun Nov 5 23:09:25 EST 2006


Jim candela wrote:


>A SB-200 is good for 100 to 130 watts RF output (carrier only) on AM.
> This amount on top of a ranger output is way less than 1 S-unit.....

Problem is sig reports go from barely readable to 20 over when I turn on 
the amp.

 >Replace that SB-200 with a SB-220 and the story
> changes considerably where 350+ watts (carrier)

Sad story is that I thought I was buying a 220 but after driving 100 
miles to pick it up, it turned into a 200.


> The power supplies and air cooling methods require you to de-rate the
> theoretical capabilities of the tubes when running AM.

I have a muffin fan on top sucking air out and it seems to help a lot.

js

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