Re: [Elecraft] KTCX03-1 high stability reference oscillator

2019-05-20 Thread Bob McGraw K4TAX
I ordered my K3S with the optional KTCX03-1-F which the description shows "1 ppm f/w correction to 0.5 ppm, factory installed". In 3+ years of use, I check the calibration on a monthly basis. I find it to be always better than +/- 1 Hz at 10 MHz.   I have adjusted the Ref Osc as needed.  I fin

Re: [Elecraft] KTCX03-1 high stability reference oscillator

2019-05-20 Thread Edward R Cole
Elecraft specs from my 2010 K3: TCXO01 = +/- 5ppm for 0 to 50c TCXO03 = +/- 1ppm But I recall Wayne stating the TCXO03 actually does close to 0.5 ppm At 28-MHz 5ppm = 140 Hz, 1ppm = 28 Hz, 0.5ppm = 14 Hz I installed the EXREF on my K3 with an external OCXO 10-MHz standard. At 28-MHz I measure

Re: [Elecraft] KTCX03-1 high stability reference oscillator

2019-05-19 Thread HB
More good info!! I went ahead and ordered the KTCX03-1 and the 2m transverter reference lock upgrade. From: Mike Harris via Elecraft Sent: Sunday, May 19, 2019 5:41 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] KTCX03-1 high stability reference oscillator Yes, a 10MHz GPS locked

Re: [Elecraft] KTCX03-1 high stability reference oscillator

2019-05-19 Thread Mike Harris via Elecraft
Yes, a 10MHz GPS locked reference source. Or wait for about an hour from cold for the TXCO to stabilise. Calibration might be off, east to correct, but it will not be moving much. Regards, Mike VP8NO On 19/05/2019 18:02, HB wrote: Thanks Jim….Good feedback. Any other worthwhile mods to ac

Re: [Elecraft] KTCX03-1 high stability reference oscillator

2019-05-19 Thread HB
Thanks Jim….Good feedback. Any other worthwhile mods to achieve stability? Hank K4HYJ From: Jim - N4ST Sent: Sunday, May 19, 2019 4:49 PM To: h...@optilink.us; elecraft@mailman.qth.net Subject: RE: [Elecraft] KTCX03-1 high stability reference oscillator Hank, From time to time I do meteor

Re: [Elecraft] KTCX03-1 high stability reference oscillator

2019-05-19 Thread Jim - N4ST
Hank, >From time to time I do meteor scatter on 6M and being 200 Hz off with MSK-144 means you won't decode. While the standard oscillator should keep me within bounds when properly calibrated, I experienced problems. Installing a new KTCX03 cured my stability issues. This wouldn't be a problem on

Re: [Elecraft] KTCX03-1 high stability reference oscillator

2019-05-19 Thread Don Wilhelm
Hank, The real world difference is that you will see less change with temperature changes with the high stability TCXO. The phase noise improvement is provided with the new synthesizers and not with the TCXO. 73, Don W3FPR On 5/19/2019 1:35 PM, h...@optilink.us wrote: Hey Folks. In real