[MRCA] Tadiran RT/PRC-601 Help
Wammes Witkop
wammes at greenradios.com
Sun Jul 21 04:13:50 EDT 2019
Hi Mark,
One of those places with very little information, on the internet, might
have been my site:
http://greenradios.com/Radios/Israeli/Tadiran/Prc_604.htm
Back then, when I bought these radio's some 25 years ago, I did search
high and low as well and nothing popped up. Some five years later I got
an e-mail from an Israeli engineer who had been involved in the
development of these radio's, but at the time I was too busy with my
firm to find the time to really follow up on that lead. And the e-mail
is long gone, dissolved in some HD crash.
If you would find more info, please share it so I might include it in my
website. Good luck hunting!
Grtz, Wammes Witkop
Op 21-7-2019 om 01:07 schreef MilComm Guy:
> 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
> <mailto: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 <mailto: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 <mailto: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 <mailto: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>
> > <mailto: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> <http://www.n1xbm.com>
> >>
> >> On Sat, Jul 20, 2019, 10:13 MilComm Guy <m38inmaine at gmail.com
> <mailto:m38inmaine at gmail.com>
> >> <mailto: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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