[amsat-bb] ISS Digipeater is back! On UHF this time (437.550MHz)!
bruninga at usna.edu
Wed Nov 2 16:00:31 UTC 2016
> I'm not so lazy that turning the dial is the end of the world,
I may be reading too much into that statement, but just to be clear...
it is not that simple... On most FM rigs you cannot turn the knob both
ways at once, to the left for TX and to the right for RX . You have to
tune the TX and RX in opposite directions at the same time every 2 minutes
or so. Hence, the suggestion to pre-tune the -/+10, -/+5 , 0, +/-5, and
+/-10 kHz offsets in 5 memories to make it trivial to make the 5 steps
during the pass.
From: Robert Bruninga
Sent: Wednesday, November 02, 2016 11:06 AM
To: AMSAT BB
Subject: Re: [amsat-bb] ISS Digipeater is back! On UHF this time
Great! But... Everyone must remember, UHF packet is *not* appliance
You must oppositely tune for Doppler on the uplink starting low, and going
high, while tuning the downlink High and going low. Best to pre-program 5
channels and switch during the event. If you do not do this, you are
simplky QRM to everyone else, blocking their successes with your failures.
From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of John Brier
Sent: Wednesday, November 02, 2016 10:52 AM
To: AMSAT BB
Subject: [amsat-bb] ISS Digipeater is back! On UHF this time (437.550
I didn't see this on amsat-bb yet.
I plan on trying the upcoming 16:45 UTC pass.
"#ARISS ISS packet system now operational on UHF (437.550 MHz). #hamradio"
"Due to the failure of the VHF radio in the Columbus module the packet
system on 145.825 is not possible. The crew just swapped the radio for the
UHF equivalent and packet is now operational on 437.550 MHz.
The Kenwood D700 radios were augmented a couple years ago by a Kenwood
D710E radio that was dedicated to SSTV operations. The Russian team soon
afterwards adopted the D710E as their only operational radio but it was
never configured for packet operations.
The ARISS team is working on flying replacement D710GA models to replace
and unify all the hardware. Target for delivery is late 2017.
Submitted by N5VHO on Tue, 2016-11-01 17:14."
73, John Brier KG4AKV
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