[OZAPRS] UHF APRS freqs in VK

Glen English VK1XX glenlist at pacificmedia.com.au
Sun Nov 12 19:32:20 AEDT 2017


Hi Scott

yeah 439.1 which is USELESS DUMB IDEA I EVER HEARD OF , I see it in the
bandplan.

why ? because it is too close to easily diplex into existing 70cm
repeater systems that it might have to share with. Whoever came up with
439.1 had NFI.

Two problems

1) requires lots of filtering and or loss to combine with 438-440
transmitters

2) Because the digi would need to RECEIVE next door to the 70cm repeater
transmitter, it will just get knocked over with TX noise unless you
throw something like 3 x 6" 3/4 wave cans at it.... like no way.

Canberra city is going on 442.975
Ginini will go on 442.775 , tentatively, barring staying out of the way
of numerous UHF repeater links..
Maybe they should go on 12.5k offsets to stay clear. hmm.

200kHz apart in the same region is far enough that sidebands and spurs
from one TX (say on 442.775) will not get into the other receiver (say
on 442.975)

:-)
g





More information about the OZAPRS mailing list