[Collins] Re: Collins digest, Vol 4 #213 - 1 msg
Jim Brannigan
[email protected]
Sat, 23 Aug 2003 07:57:30 -0400
I have a New-in -box National R175A Plate choke.
Quoted from the National Co. catalog pages in the back of the Radio
Amateurs Handbook, 1956, advertising pages:
"R-175A. The R-175A choke is a revised version of the R-175 choke. The
revision has made the reactance of the choke high throughout the 6 meter
band as well as the 10, 15, 20, 40 and 80 meter bands. The R-175A choke is
suitable for parallel-feed as well as series-feed in transmitters with plate
supply up to 3000 volts modulated or 4000 volts unmodulated. Inductance 145
uH., distributed capacity 0.6 mmf., d-c resistance 5 ohms, d-c current 800
ma., voltage breakdown to base 12,500 volts"
Jim
> Does anyone know of a source or the 90 UH ceramic RF choke? Surplus Sales
> has one that is advertised as being for the KWS-1, but after speaking with
Bob
> Grinell we concluded that it is a 45 UH choke, different in design and
would
> not serve.