I've seen earlier parts of this series, but never a rationale for the
existence of such an amplifier. It's beautifully built, but...
73, Pete N4ZR
Check out the new Reverse Beacon Network
web server at<https://reversebeacon.net>.
For spots, please use your favorite
"retail" DX cluster.
On 11/22/2022 4:52 PM, jim.thom jim.thom@telus.net wrote:
Here the paralleled, high power RJ2B output relays are installed on a
custom bracket. RG-400 teflon coax is used for the bypass leg. It goes
through a grommet..and terminates on the smaller input RJ1A vac relay.
More RG-400 tefon coax from input SO-239 connector...to the same RJ1A input
relay. SFT-600 teflon coax (blue) used between the pair of output
relays...and the output coax connector...which is a 7-16 DIN female
type. The output relays coils are wired in parallel, with the back emf
diode across one of the coils.
This completes the vac relay installation and wiring. A total of 4 x vac
relays are used. (1) input. (2) cutoff bias. (3+4) paralleled output
relays. The feedthrough (bypass) swr will be measured, and a
compensation cap installed to cancel out residual XL. SFT-600 teflon
coax is the teflon version of LMR-600..and dwarfs RG-393.
https://www.youtube.com/watch?v=Jt7Iv8X84lY
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