[1000mp] Why??

[D. J.]

I agree it's badly written, perhaps not intentional.

I think what they mean to say is the TCXO will maintain within 0.25 PPM 
from 0 to 25 degrees C.  and that between 0 and 50 degrees C the 
stability can only be maintained to 0.5 PPM.  This holds true for the 
other TCXO which comes with the MKv.  It's all kind of not important 
because none of us operate our rigs outside in the winter time in a 
snowbank.  Our shacks are somewhat a controlled climate with fairly 
steady temps, so not to worry, at 5 Mhz the drift under worst case 
would only be a few hz.

73
Dale, K9VUJ


On Aug 5, 2004, at 11:02, Al Toothaker wrote:

> Yaesu is playing (a little) specsmanship when talking about PPMs for
> stability at a single temperature and on the next line in the specs, 
> talks
> about a range of temperature operation.  If the stability does not 
> hold over
> a range, what other specs also vary with temp?  For me, I really don't 
> care
> since the rig makes the QSOs I want.
> Al
> N6TA
>
> -----Original Message-----
> From: 1000mp-bounces at mailman.qth.net
> [mailto:1000mp-bounces at mailman.qth.net]On Behalf Of D. J.
> Sent: Thursday, August 05, 2004 01:05
> To: All about Yaesu 1000mp
> Subject: Re: [1000mp] Why??
>
>
> Page 1-2 of the FT-1000MP service manual:
>
> TCXO-4 <+- 2.0 PPM  (0 - +50 C)
> TCXO-6 <+- 0.5 PPM  (0 - +50 C)
>
> I think where the confusion lies is the way Yaesu states the stability
> in your MPMKv user & service manual.  0.5 PPM (parts per million) after
> 1 min at 25 C and 0.25 PPM after 1 min at 25 C with TCXO-6.
>
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