[amsat-bb] Re: IARU Region 1 - Increased Amateur Sat 2 Metre Usage

Edward R. Cole al7eb@acsalaska.net
Mon Aug 28 05:55:14 PDT 2006

Not True!  CW 2m-EME is 144.020-144.100, and digital EME is
144.100-144.700.  Digital EME refers to the mode JT65 designed by W1JT
which began about 2003 with JT44 (its predecessor).

The area below 144.020 is filled with birdies nearly world-wide and useless
for any "weak-signal" operation Including satellite.  Just because one may
not hear much local activity on those frequencies does not mean that they
are not occupied by eme signals.  One can point a single 22 element
satellite x-yagi at the Moon and with 100-200w operate digital eme these
days.  The signal from such a small station are not audible but the
powerful JT65 sw can dig them out of the noise.  I have over 70 contacts on
eme with 125w at my antenna terminals, yet you would not hear my signal if
over 100 miles away from me if merely listening by ear (I would detect your
10w signal even pointing above the horizon).

In Europe, I understand that 144-144.100 is used for terrestrial DX (tropo,
ms, FAI and auroral propagation).  You will not find the "weak signal" CW
community willing to lose the last suband that they have (100 KHz out of 2
MHz).  Satellite has 145.800-146 MHz at present.  If 144.300 subband has
been occupied by other modes it is due to inactivity by satellite.  I would
guess there is no spectrum available for satellite to move on the 2m band.

73's Ed - KL7UW

At 01:42 PM 8/28/2006 +0200, Fabio Roccatagliata wrote:
>I know the 144.000/144.035 is world-wide assigned to EME but actually
>all the EME contacts are almost made from 144.100 and above.
>Doing a research on the cluster there are no EME contacts on the segment I
>The newsletter proposed to use the segment 144.315-144.365 for sat
>uplink that, in my opinion, I think is more used.
>In any case, since the bandplan covers all the 144-146Mhz segment, I
>suppose something has to be moved away if a sat reassignation
>frequencies has to be made so the question is: Which segment is more
>suitable for that ?
>> Hi Fabio, IZ1EGT
>> Unfortunately I cannot open the page
>> > http://www.iaru-r1.org/Newsletter_43a.pdf
>> Glad if you or Trevor can send to me the above 43a.pdf file as an
>> attachement.
>> Anyway according to the actual 144-146 MHz Bandplan IARU Region-1
>> the segment 144.000 to 144.035 MHz that you propose is used world-wide
>> for 2 meters EME (SSB & Telegraphy )...........WOW ! !
>> 73" de
>> i8CVS Domenico
>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
Ed - KL7UW  
http://www.qsl.net/al7eb - BP40iq 
144-EME: FT-847, mgf-1801/1402, 4xM2-xpol-20, 170w
432-EME: FT-847, mgf-1402, 1x21-ele (18.6 dBi), 60w

More information about the AMSAT-BB mailing list