[Amps] stuff forsale!

[Peter Voelpel]

You will need much less cross section for the coil if you build the tank as
a Pi-L circuit.
With far less RF current trough the coil you get the same or better harmonic
suppression.
Pi-L is ideal for monoband amps, especially if you are already using vacuum
caps.
Those capacitors can be made much smaller as well and no padders are needed.
On mine caps are 300pf and 2000pf.

73
Peter



-----Original Message-----
From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Jim Thomson
Sent: Dienstag, 16. Oktober 2018 15:21


##  I am in the process  of  helping to design a 160m  mono band  YC-156
for a friend. 
I have access to  .375 inch edge wound ribbon coil stock.... and also .5
inch, edge wound ribbon stock.
That will make for  the most compact  coil assy..... vs  using a tubing
coil.   Ceramic vac  tune cap used,
plus a 50-4000 pf  ceramic  vac load cap.   Vac relays on both input and
output, full qsk, since the fellow is
a hard core  QSK  operator.   I also have some  8 gauge airdux coils, large
diameter types, that would also work. 

##  although  160 M  RTTY might not be as popular as other bands,  newer
mode like  FT-8, esp on bands like 160M,
would require a robust tank output  configuration.   This is not  rocket
science.  The way to deal with heat...is to not generate
it in the  1st place. 

Jim   VE7RF



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