Thanks Glenn.
When I first noticed the 910 kHz relationship, 455 IF was
the first thing that popped into my mind... until I
realized the Micor doesn't have a 455 kHz IF. Darn,
another good theory ruined...
Since I have 3 similar radios exhibiting exactly the same
problem I am thinking this may be an inherent design vs.
application problem. Motorola never intended these radios
to transmit below the receive frequency, nor were they
intended for use below 450 MHz. But if it is, I was hoping
others would step forward and verify that. Surely I
couldn't be the first to discover it. If I could verify
it's the nature of the beast, at least I would know I'm not
going to cure it.
Paul
On Saturday 02 July 2005 10:59 am, Glenn Little WB4UIV
wrote:
> Paul
>
> 910 Kc is twice the 455 Kc IF. Possibly there is a clue
> here. Motorola had problems with spurs in the Metrum VHF
> ham transceiver. It also used one crystal for both
> transmit and receive. I guess that this is a good data
> point as to why mobiles should not be used as repeaters.
> The repeater and base station is a complete redesign and
> uses separate crystals for transmit and receive. Probably
> they saw the problem and made the intelligent decision to
> keep the spurs at ground level in the mobiles and use a
> clean transmitter for base stations and repeaters.
>
> This is an observation from someone that made a decision
> a long time ago that mobiles were not designed for
> repeater service.
>
> Hope you can solve the spur problem. Probably related to
> the transmitter/receiver offset and will probably require
> a redesign to get rid of the spur.
>
> 73
> Glenn
> WB4UIV
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