[MRCA] Tadiran RT/PRC-601 Help

Sat Jul 20 19:08:44 EDT 2019

Thank you Peter but I don't have any kind or radio test equipment.

On Sat, Jul 20, 2019 at 7:07 PM MilComm Guy <m38inmaine at gmail.com> wrote:

> 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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