[Drake] Re: [Collins] 60 meter crystal

[Garey Barrell]

Bill -

Thanks!   I stand corrected.  The SIL 2-75 is also available on the
CCA site, and you don't need a password!

They did what I mentioned below by "weaseling" in between the problem
spots!  The 200 kHz range limitation helps in this regard.

Drake did something similar for 30M, recommending a particular crystal
to give a 10.1 to 10.6 MHz range instead of the "normal" 10.0 to 10.5
MHz coverage.  I guess there wasn't any demand for 5 to 6 MHz for
Drake, so they never investigated further.  I also think it would be a
lot harder to sneak into that area with the carrier oscillator and PTO
"right there".

We can use our Collins on the new "frequencies" when they become
available!  :-)

Thanks again!

73, Garey - K4OAH
Atlanta

----- Original Message ----- 
From: "Bill Abate" <wabate@dandy.net>

> Collins long ago came out with a service bulletin allowing use on
most
> frequencies between 5 and 6 mhz.  That bulletin is available on the
CRA
> website at http://www.collinsra.com/.  It seems there was a lot of
> interest in those frequencies at that time and Collins did a study.
> Guess they were too quick to condemn the whole megahertz.  In any
event
> we can use our Collins on the new band when it becomes available.
>
> I am not aware of any study by Drake reversing their position on
those
> frequencies.
>
> 73,
>
> Bill, K3PGB
>
> Garey Barrell wrote:
> >
> > Joel -
> >
> > Drake specifically says "Do Not Use" for the 5 to 6 MHz range for
the
> > 4 Series.  Probably because the Carrier Oscillator is at 5.645 MHz
and
> > the PTO tunes from 4.955 to 5.455 MHz.  Just too many unpleasant
> > possibilities.  The TR-7 "might" be ok because of the
up-conversion
> > scheme, but the PTO still runs in the 5.05 to 5.55 kHz range and
the
> > carrier oscillator is at 5.645.  Power supply decoupling is fine,
but
> > ...
> >
> > Collins also says "Avoid operation" between 5 and 6.5 MHz for the
> > S-Line, again because their PTO tunes from 2.5 to 2.7 MHz, putting
the
> > second harmonic at 5.0 to 5.4 MHz.  Since the 60M frequencies are
at
> > 5332, 5348, 5368, 5373, and 5405 kHz, it would be asking for
trouble!!
> > With the narrower band coverage of the S-Line (200 kHz v. 500kHz
in
> > the Drake,) it might be possible to "weasel" in there with a
specific
> > crystal and PTO setting, but I'd hate for us to lose this VERY
closely
> > watched experimental "band" because of unanticipated spurs from MY
> > transmitter!!
> >
> > I wouldn't want to risk it without a VERY close examination with a
> > spectrum analyzer.
> >
> > Obviously it wouldn't be a problem to "listen" with the
appropriate
> > crystal with any of the above, although you might hear a few
strange
> > "spurious" signals.
> >
> > Probably going to be limited to the KenYaeCom crowd!.
> >
> > 73, Garey - K4OAH
> > Atlanta
> >
> > ----- Original Message -----
> > From: "Joel R. Hallas" <joel.hallas@snet.net>
> >
> > > Glen,
> > >
> > > I notice that the Collins specs do not cover 5 - 6 MHz. Are
there
> > > spurious emmissions in that range? I note my Drake C-line has
the
> > same
> > > limitatiion and wonder if anyone has successfully operated
there?
> > >
> > > Thanks & 73, Joel Hallas, W1ZR
> > >
> > > Glen Zook wrote:
> > >
> > > > I have at least one extra, maybe several more (have to
> > > > look around) 8455 KHz crystals which will give 5300 to
> > > > 5500 KHz and cover the new 60 meter band on the 75S
> > > > series receivers, 32S series transmitters, and KWM-2
> > > > series transceivers.
> > > >
> > > > Am open to trades for ......?
> > > >
> > > > I don't need any WARC crystals, have had them for
> > > > years.
> > > >
> > > > I also believe that I have a couple 13155 KHz crystals
> > > > that give the 30 meter band (10.0 - 10.2 MHz) plus WWV
> > > > at 10.0 MHz.  Same deal as above.
> > > >
> > > > Glen, K9STH