[VHFcontesting] [VHF] Warmup Drift Of Ukranian , UT5JCW, 222 MHz Transverters & Possible Use With FT-8

[JamesDuffey]

Pete - I am curious, recently the Transverters Store has gone to a 1ppM TCXO for the LO, which should be better than the old DIP oscillator. Did Steve check the old DIP one or the new TCXO one? - Duffey KK6MC

James Duffey KK6MC
Cedar Crest NM

> On Apr 16, 2021, at 08:32, peter h via VHF <vhf at w6yx.stanford.edu> wrote:
> 
> 0715pdt 16april2021
> A number of us in SoCal have been using UT5JCW's 222MHz transverters with good success on CW/SSB/FM from home and hilltopping/roving.
> Tim, N6GP, wondered if they are suitable for use on FT-8.
> Steve, WA6EJO, 'volunteered' to plot drift data on his UT5JCW 222MHz transverter.
> His results are tabulated below.
>    Steve, WA6EJO, did some transmit frequency stability tests using a GPSDO referenced frequency counter.
>  Some of the drift may be due to the exciter, a TS2000X, but most is from the Ukranian transverter. 
>  From 2 to 3 minutes after power on it moved -227 Hz 3 to 4 minutes -103 Hz 4 to 5 minutes -64 Hz 5 to 6 minutes -45 Hz 6 to 7 minutes -27 Hz 7 to 8 minutes -21 Hz 8 to 9 minutes -17 Hz 9 to 10 minutes -7 Hz 10 to 15 minutes +50 Hz 15 to 20 minutes +13 Hz 20 to 25 minutes +47 Hz 25 to 30 minutes +37 Hz
> 
> 
> Do any experienced FT-8 users have any comments on possible use of the transverters with data modes?
> Thanks,
> BT73
> Pete, N6ZE 
> 
> 
> 
> 
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