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HELP: SPX-2550 (SL70)

Posted: Sun Jan 20, 2008 8:29 am
by Howard_G7LQY
I have got one of these radios and i would like to put it on the
2mtr ham band in the uk (144-146Mhz).

The model no of this radio is SPX-2550 NH
Programmer says it is 136 - 174 Mhz

When i try to prog 144.83750 rx & tx, it seems to go in ok, but when
i turn radio back on after programming it, all i get is a "beep beep" and
no rx or tx. :(
Any help welcome

Howard G7LQY :)

Re: HELP: SPX-2550 (SL70)

Posted: Wed Jan 23, 2008 2:04 pm
by Howard_G7LQY
So nobody knows anything about this radio then ???? :(

Re: HELP: SPX-2550 (SL70)

Posted: Thu Jan 24, 2008 6:29 pm
by k2hz
I am familiar with the SP-2550 but I know nothing about the SPX-2550. If it is the same as the SL-70 I know a little about the version made by Maxon but sold by GE in the US as the "Monogram".

The radio does cover 136-174 but only with realignment to operate in about a 7 MHz bandwidth or up to 12 MHz with some degradation. The US versions came factory tuned to the center of either 148-160 or 160-174 and it was necessary to retune if you were not near the center of the band.

Did your radio work before you changed it to the 2M band and what frequency was it on before? I suspect it will need the VCO retuned for any operation and a full TX/RX alignment for good performance unless it was already tuned for the 144-148 range.

Dick K2HZ

Re: HELP: SPX-2550 (SL70)

Posted: Tue Jun 01, 2010 3:42 pm
by KevinBleicester
It such a long time but i have the same problem, for sum reason my sl70 spx2550 nh only work with spx2550 m software hope this helps