[MRCA] Tadiran RT/PRC-601 Help

Sat Jul 20 19:07:47 EDT 2019

The seller is going to try and find me some crystals, we will see, although
the auction stated it was coming from FL it actually shipped from Caracas
Venezuela, some research on this radio model shows some other units were
sold from the same location some time ago.  I have no documentation for the
radio nor can I find any.  The only information I have is what I found on
the internet which was very little.  Hopefully I can obtain an original
crystal and determine from it's markings what it is or if the information I
have is correct.  Thank you for your input.

On Sat, Jul 20, 2019 at 1:47 PM J Mcvey via MRCA <mrca at mailman.qth.net>
wrote:

> Never tried that , but probably won't  work because the feed back is
> designed for a xtal.
> the service manual should detail how the oscillator circuit works.
> On Saturday, July 20, 2019, 1:19:00 PM EDT, Peter Gottlieb <
> kb2vtl at gmail.com> wrote:
>
>
> Can you feed a sig gen in at that freq to check?
>
>
> On 7/20/2019 1:17 PM, J Mcvey via MRCA wrote:
> > oops i meant 72.4/5 =14.48
> >
> > On Saturday, July 20, 2019, 1:13:13 PM EDT, J Mcvey via MRCA
> > <mrca at mailman.qth.net> wrote:
> >
> >
> > I'm a bit perplexed by that chart and the use of a 5th overtone xtal.
> > Are you sure they are using 5th overtone?
> > The overtone implies that it is using a frequency multiplier circuit
> rather
> > than the fundamental frequency.
> > That means that the FUNDAMENTAL frequency  would be 74.5/5 =14.9 MHZ but
> the
> > 5th harmonic is used for the oscillator output,
> >
> > If I were you, I'd do a little more research to be sure about what you
> need.
> >
> > On Saturday, July 20, 2019, 12:51:11 PM EDT, Mkdorney via MRCA
> > <mrca at mailman.qth.net> wrote:
> >
> >
> > Crystal holders have so many different nomenclatures depending on the
> radio,
> > crystal manufacturer etc. Are those the same crystals used on a CPRC-26
> ?
> >  Google your crystal nomenclature and see what pops up. Get crystals
> that will
> > allow the radio to function and also allow for legal operation.
> >
> > I would not recommend harassing a military base with any type of radio
> > traffic. They tend to get rather upset about that, and use their DF gear
> to
> > find you, resulting in a substantial fine and maybe confiscation of your
> > radio. ( maybe that explains the missing crystals).
> >
> >
> > Mark
> > WW2RDO
> >
> > “In matters of style, float with the current. In matters of Principle,
> stand
> > like a rock. “.   -   Thomas Jefferson
> >
> > Sent from my iPhone
> >
> > On Jul 20, 2019, at 12:29 PM, Robert Newberry <N1XBM at amsat.org
> > <mailto:N1XBM at amsat.org>> wrote:
> >
> >> But ...but..., I saw that auction and the seller specifically stated he
> >> harraresd the local military base with it...
> >>
> >> N1XBM
> >> Apparare Scientor
> >> Paratus Communicare
> >> www.n1xbm.com <http://www.n1xbm.com>
> >>
> >> On Sat, Jul 20, 2019, 10:13 MilComm Guy <m38inmaine at gmail.com
> >> <mailto:m38inmaine at gmail.com>> wrote:
> >>
> >>    So I purchased this neat little squad radio labeled RT-601 47-57 Mhz
> to
> >>    use on 51Mhz, the seller stated it worked.  So it arrived today and I
> >>    opened up the cover where the crystals(up to six)are and they are all
> >>    gone.  I have to doubt it was working, I figured I would need to
> purchase
> >>    a new crystal any way, just disappointed.
> >>    So does any one here have one of these up and running ?  Next big
> >>    question is where can I order a crystal for it?  According to the
> single
> >>    source I found it uses a CR-83/U crystal, a chart I found says the
> >>    CR-83/U is a 5th overtone in a HC-50/U enclosure.  The chart inside
> the
> >>    radio says to add +21.4, so if I order a crystal I want the crystal
> >>    frequency 72.4Mhz ?
> >>    <DSCN5141.JPG>
> >>    <DSCN5142.JPG>
> >>    <DSCN5143.JPG>
> >>    I am in the process of making a battery adapter, it uses a battery
> much
> >>    like the PRC-90 but larger diameter.
> >>
> >>    Thank you
> >>    Mark
> >>    K1HF
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