Hi Scot and all who responded,
The MA925 synthesizer board manual and discussion with my fellow ham Jeff Yeo reveals that it is relatively easy to limit the operation to comply to the ham band It will be by means of reading data input ML 2, 6, 9, 11 and 13 (ref table 2 in pg 2-4 part 3 and table 3 in pg 2-5 part 3 in the MA925 manual) then compare these to a table of values representing the frequencies within ham bands, then enable ptt if the comparison generates a true status, disable ptt if false status is generated. This reading and comparing can be achieved by means of a small customed made microprocessor installed into the radio with relatively straight forward 'C' program code burnt into an Eprom to read and compare values.
Guess the problem is solved and marriage to Miss Greenie (Syncal 30) saved ; )
73
James Puah 9V1JP
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-----Original Message-----
From: James Puah
Sent: Tuesday, October 12, 2010 6:32 AM
To: Racal-manpacks@...
Subject: RE: [Racal-manpacks] How to limit the operational frequency of Syncal 30
Scot,
Yes, bandstop filter is not enough, just like I can enable general transmit in modern ham radios by
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-----Original Message-----
From: Scott Dorsey Sent: Tuesday, October 12, 2010 6:22 AM
To: Racal-manpacks@...
Subject: Re: [Racal-manpacks] How to limit the operational frequency of Syncal 30
If it's a legal matter, it probably needs to stop _exactly_ on the band edges,
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