chirpAB.csv
Chirp data with names for NSW
Duplexer Basics
notes on the various types
Hybrid Ring
notes on the Hybrid Ring
PA0NHC 2m
cavity set Made in fiberglass circuit board
details
W1GAN 2m
cavity set, July 1972
Repeater-Builder.com Coupling loops.
WB5WPA heliax cavity set, what can be achieved
10m
cavity set, May 2013
53MHz (6m) repeater cavity, 1MHz split
6m cavity, only one weld design.
Collar and plug
only parts machined. Not seen, is the tuning mechanism.
A 12mm rod passes through centre of the plug, which is
50 mm past the end of the centre pipe, then inside the
32mm pipe, insulator, 50mm of 40mm heliax foam dielectric.r
This also holds the centre pipe rigid at the far end.
6m cavity sweep, 1MHz pass to notch
150mm OD dia cavity coupling loop, 32mm OD inner pipe 140mm long.
Loop is flat to centre pipe for minimal coupling.
Trimmer is a one plate compression mica.Loop wire 3mm.
Really good 2RackUnit UHF cavity set, front
Dec 1984
Really good 2RackUnit UHF cavity set, rear
There is a trimmer under the little
cap, one is seen RHS of green "TX" label, in there is some magic, as
adjusting them sets the wideband (+-20MHz) rejection frequency.
This unit was on 470MHz, now 439MHz, no mods, only adjustment.
6m and 2m notes
Motorola T1500 cavity notes
70cm cavity notes
2m cavity notes
BMARC 2m cavity notes