[AMPS] Augmenting SB-220 power supply

[Rich Measures]

>
>Hello Bob,
>
>I would think it is perfectly do-able.
>
>W3LPL, a super M/M contest station in MD, has ONE, really MASSIVE
>xformer/pwr supply providing all the HV for 5 different 3-1000 home brew
>amps, which all run at the same time.
>
>There may be some secrets to doing this other than having enough total
>current capability, but I'm not aware of them.
>
The secret is that there are many hams who waste money on humungous anode supply transformers.  I know a guy in San Diego whose plate tranny is so big it lives in a doghouse outside the house.  .  .  How much is enough?.  A standard Peter W. Dahl 3kV 1.5A Hipersil® transformer [70 pounder]  powers an 8171 on SSB, providing c. 7800vdc during an "ahhhhhhhhhh" and 9100vdc during RX.  [FWVD rectification].  The power gain is 20db.  Transformer heating is reasonable.  Would a bigger transformer have been better?.  Not for SSB.  However, to use the 8171 at full suds on RTTY broadcasting, a 280 pounder, as well as a resonant-choke filter would likely be needed.  .  And yet there are guys who buy one of Peter's 70 pounders to use outboard with an SB-220.  
-  later, Steve.  


Rich...

R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures  


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