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@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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