[1000mp] Why??

[D. J.]

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.

The TCXO-4 and -6 are spec at 2.0 and 0.5 at 50 degree C temp range but 
hold the .5 and .25 within 25 degree C temp range.

If you remember the FT-1000 came with a 2.0 PPM TCXO and the FT-1000D 
came with a 0.5 PPM TCXO.  Icom specs their CR-282 which is .5 PPM at 
-30 to + 60 degrees C  which is a tighter spec than the either of the 
Yaesu TCXOs.

Also when adjusting for frequency accuracy I always try to adjust with 
the highest frequency WWV station, usually 15 Mhz and I use the 600 hz 
sidetone with the MP main receiver in USB or LSB  and the sub VFO on 
AM.  I've only adjusted the MKV once and I have the 2.0 PPM standard 
TCXO.   The sidetone always works for me.  Try it.

One more thing, I drilled a very small hole in the side of my MKV so 
that I can adjust the TCXO without taking the cover off.  I have a 
small plastic plug that goes in the hole.   I wish Yaesu would have 
done that at the factory.  The Icom 775 has a fine adjustment on the 
side of the radio accessible without removing the covers.

Anyway have fun.

73
Dale



On Aug 4, 2004, at 19:48, John L Merrill wrote:

> I guess the manual lies.
>
> John N1JM
>
> -----Original Message-----
> From: 1000mp-bounces at mailman.qth.net
> [mailto:1000mp-bounces at mailman.qth.net]On Behalf Of D. J.
> Sent: Wednesday, August 04, 2004 7:13 PM
> To: All about Yaesu 1000mp
> Subject: Re: [1000mp] Why??
>
>
>
> On Aug 4, 2004, at 5:37, John L Merrill wrote:
>
>> the tcxo4(standard on the Field or MkV) is .5ppm and the tcxo6 is
>> .25ppm. I
>> think either one would suffice in the 60mtr band.
>>
>> John N1JM
>>
>
> Check again John.  The standard TCXO is 2.0 PPM  optional is .5 PPM.
> At first that was my understanding, but looking closer it's not the
> case.
>
> Dale, K9VUJ
>
>
>
>
>
>> -----Original Message-----
>> From: 1000mp-bounces at mailman.qth.net
>> [mailto:1000mp-bounces at mailman.qth.net]On Behalf Of Hans Remeeus
>> Sent: Wednesday, August 04, 2004 12:27 AM
>> To: All about Yaesu 1000mp
>> Subject: Re: [1000mp] Why??
>>
>>
>> I cannot imagine why you should use a TCXO and 2.4 bandwidth
>> especially for
>> 60 meters...
>>
>> I have the Mark-V with TCXO-6, but actually cannot notice any
>> difference
>> between the standard TCXO-4 and the optional TCXO-6. Perhaps in severe
>> circumstances when temperature is varying very much and you want to
>> make
>> digital communications on one single frequency.
>>
>> For optimal speech fidility I would prefer the standard 6.0 kHz TX 
>> EDSP
>> bandwidth.
>>
>> Both the TCXO and 2.4 bandwidth will effect the other bands too.
>>
>>
>>
>> 73, Hans Remeeus.
>> Ham Radio: PA1HR
>> www.remeeus.nl
>>
>> Communication is about people, the rest is technology.
>>
>>
>> ----- Original Message -----
>> From: "Bob Main" <bobmain1 at alltel.net>
>> To: "MarkV" <1000mp at mailman.qth.net>
>> Sent: Wednesday, August 04, 2004 1:32 AM
>> Subject: [1000mp] Why??
>>
>>
>> I've had a senior moment here.  Someone earlier today mentioned that 
>> in
>> order to work 60 mtrs legally you needed the TCXO and then you needed
>> to
>> change menu 5-9 to 2.4.  It's default is 6.  Now why do I have to do
>> this?
>> I have the TCXO and it is installed and I changed 5-9 from 6 to 2.4,
>> but
>> why?  Also what effect does it have on other bands/modes?
>>
>> Bob
>> KB4CL
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