IARU proposal for HAB telemetry in 70cm Bandplan

[Ross G6GVI]

Thanks to Trevor for spotting an item before the International Amateur Radio Union Region 1 (Europe) conference coming up in Vienna in September, where a Belgian Amateur proposes adding a specific reference to narrowband HAB telemetry into the Region 1 Bandplan for 70cm:

https://storage.iaru-r1.org/index.php/s/7PYm5kqQKdqCmZC?dir=/&editing=false&openfile=true

I wonder why he's suggested 434.500 rather than 434.715, which is by far the most popular channel?

Even if adopted, this will not be applicable in the UK, were Amateur airborne operation is not permitted in the 70cm band anyway.

[Rick Hewett]

On Wed 22 Jul Ross G6GVI wrote:
> I wonder why he's suggested 434.500 rather than 434.715, which is by far
> the most popular channel?

Isn't 434.715 in the middle of the repeater input channel block...

--
73, Rick, M0LEP (aka lazyleopard on #highaltitude IRC)

[Ross G6GVI]

The Amateur use of that part of the band varies a lot around Europe (apart from Italy, where it's not even allocated).

However most of the flights from Belgium and the Netherlands have been using 434.715 (& 437.6) in recent years.

But you're right that in the UK it is used for the "RB" (1.6MHz split) repeater inputs - although those are on 25kHz steps (so .715 would fall between RB4 & RB5).

[Mark Jessop]

IMO any proposal needs a few adjacent channels. Ideally 10 kHz apart, though 5 kHz would possibly be usable with low-drift transmitters (RS41s are OK for this).

With the amount of flights occurring nowadays, it may end up being difficult to all coexist on a single channel. 

Where exactly in the band they go... that's one for the IARU to work out. Trying to find a hole in all the different european bandplans is going to be difficult.

73

Mark VK5QI

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[Rick Hewett]

On Wed 05 Aug Ross G6GVI wrote:
> But you're right that in the UK it is used for the "RB" (1.6MHz split)
> repeater inputs - although those are on 25kHz steps (so .715 would fall
> between RB4 & RB5).

The IARU R1 UHF bandplan has 434,594 to 434,981 kHz identified for
repeater output at 12.5 kHz spacing.

https://www.iaru-r1.org/wp-content/uploads/2021/03/UHF-Bandplan.pdf

I suspect keeping HAB away from repeaters is most likely a significant
part of the motivation behind the proposal. However, 70cms allocations
being secondary for amateur use, and the way they vary from country to
country, makes actually standardising anything a mite complicated....

The proposal is for a "Centre of Activity" (CoA) rather than a single
specific frequency, which is good as it allows for some spreading about.
>From the UK's point of view, given airborne amateur use of the band is
not permitted, about the only thing that might matter is that the CoA
falls within that bit of ISM allocation for which airborne use is
permitted.

I guess it's something worth keeping half an eye on, but I expect the
"most historic use has been here" argument would probably fall on deaf
ears.