Demi now makes a "drop-in" synthesized LO for their transverters which can
be (must be) locked to an external 10mhz oscillator. I believe they cost
around $60. I have one ordered with my 10ghz transverter. VE1ALQ makes a PLL
outboard LO that can be used on most LO frequencies and must also be locked
to 10mhz. I have ordered 2 of these for various tranverters but have not
idea how difficult they are to incorporate into the transverters. I do not
think you need to go this route to stay within the band with any of the oven
xtal oscillators.
Steve
K1IIG
>
> Sure. Depends on how much you want to put into frequency accuracy.
>
> My 902/902 transverter uses a crystal oscillator that doesn't drift at all
> after about a minute of warm-up and then only drifts a kHz at most. The
> IF rigs I use don't drift at all. I use an FT290RII and an HTX-100 with a
> built-in 144 MHz transverter.
>
> I have seen no need to phase-lock the 903 LO to a 10 MHz reference as it
> is stable and accurate enough without. I have no cencern that I am
> anywhere near the band edge when transmitting on 902.100.
>
> My transverters for 2304 and up all have phase-locked LO's and the 10 GHz
> LO is accurate to within about 200 Hz at worst and very stable. They only
> get better for the lower bands.
>
> 73, Zack W9SZ
>
>
> On Thu, 7 Aug 2008, James French wrote:
>
>> Since I have opened this can of worms... :) I should ask this then.
>>
>> Do we want to be this close to the band edge with the use of trans-
>> verters?
>>
>> What about drift and other things? Some that I know use the MFJ 2m
>> SSB/CW transceiver as the IF for their transverters and they do drift
>> a LOT even after being warmed up.
>>
>> I am VERY leary of operating that close to the band edge since I am
>> still a greenhorn to my HF frequencies and don't have the equipment to
>> test things out all the time unless you count my rat shack frequency
>> counter.
>>
>> James W8ISS
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