[1000mp] Why??

[Mike Schatzberg]

Hello Yaesu Fans:

I believe that one of the improvements in the Mark V versus the original MP,
is the standard TCXO.

Therefore, from the postings here, and the info in my service manual for the
Mark V, the specs for the new TCXO 4 is improved from the MP's 2.0 PPM, to
the Mark V's .5 PPM.  Note, they are both called TCXO -4 apparently, which
causes the confusion.

So, if you have an original standard MP, versus the newer standard Mark V,
your TCXO is four times less accurate over the temperature range.

You will see, that the Mark V, with its standard TCXO, has the same accuracy
as the older TCXO-6 in the MP.  The newly available TCXO-6 for the Mark V,
is twice as accurate as the standard TCXO-4 that the factory places in the
Mark V radio.

OK, I hope everyone has the info now, seems like many people were right
about their radios in any event.

73 and Happy Dxing,

Mike Schatzberg
WB2AJI
----- Original Message ----- 
From: "D. J." <dalej2 at mac.com>
To: "All about Yaesu 1000mp" <1000mp at mailman.qth.net>
Sent: Thursday, August 05, 2004 4:05 AM
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.
>
> 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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> >>
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