[MRCA] Tadiran RT/PRC-601 Help

[Peter Gottlieb]

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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