[Drake] Re: [Collins] 60 meter crystal

[Bill Abate]

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
> 
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