[TMC] Xtal load capacitance

[H A Layer]

Hi Larry:

I have been away for a while, and just saw your message.  I looked up my 
old (August 2007) crystal order for the GPE-1A and I searched its 
manual, but, alas, could not find any load information or requirement.  
MH Electronics did not ask for that information.  The only specs were:

3.870000 MHz, parallel resonance, 75C oven, CR-27/U holder.  And, the 
crystal has worked fine ever since.

One issue for which I  do not found an answer is the need for the 
crystal oven in ham use of TMC transmitters. Is the oven of any benefit 
for maintaining frequency stability if it is not always on 
24-hours-per-day/7-days-per-week as typical in commercial use?  I 
probably operate the transmitter a maximum of three hours in any one 
session--and a maximum of 6-hours-per-week.  Many spec sheets for 
crystals recommend two hours of heat before operation!  Seems 
unnecessary to me--especially for AM operation.

73 Hal KK6HY



On 7/18/11 11:20 AM, telegrapher at q.com wrote:
> I need to order a couple of xtals for my exciter model GPE-1 and also one for an STE-1 and hopefully a future pair of STE-5 units i have spotted taht look pretty nice.  International xtal wants to know what the load capacitance would be.  I suspect it will be 20-30 pf but don't know for sure.  I think JAN also wants that info.  I don't know that they ahve any info on the TMC line of equipment so i need to come up with something.  ANy ideas?
> Larry
> W0OGH
>