....and for most of the directional antennas currently being used and tuned for the higher Sat 2m frequencies this means bad VSWR.
On Wed, Oct 23, 2013 at 3:27 AM, Graham Shirville < g.shirville@btinternet.com> wrote:
Hi Greg,
Please have a look at Footnote 1 at the bottom of the 2 metre bandplan:
"1 - Designers and operators of satellites using this section shall not transmit below 144,0025 MHz so that a necessary guard band is provided at the bottom band edge.”
This shows that it has been thought about and probably means that it could be used for a nominally 20kHz bandwidth transponder – so long as it has decent filtering on board which is relatively easy to achieve these days!
Of course there are very very few “empty spaces” in the 144-146MHz band and even fewer that have any sort of existing international alignment.
thanks
Graham G3VZV
-----Original Message----- From: Greg D Sent: Wednesday, October 23, 2013 7:07 AM To: AMSAT BB Subject: [amsat-bb] Re: New Satellite Segment in IARU Region 2 Bandplan
Interesting... Does anyone else find it odd (or possibly irresponsible) to put a satellite allocation right up against the band edge. Didn't they consider Doppler shift? That renders the lower 3+ khz of a 25 khz slice unusable. Or is this only for NSS use?
Greg KO6TH
M5AKA wrote:
New Satellite Segment in IARU Region 2 Bandplan
http://amsat-uk.org/2013/10/22/new-satellite-segment-in-iaru-region-2-bandpl... _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb