[MRCA] Communist radio wakes up from a long sleep

[Meir WF2U]

Hi Al,

Those two dots and their locking levers are for two presettable frequencies, similar to the "flick" function on the good old Wireless Set 19. You tune the 2 desired frequency and lock the levers. You can then "flick" the dial to those frequencies. For example you set your net frequency on one, and the other to another net. Just turn the dial to the next click. 
If you need the receiver schematic, I'll scan it for you.

Have fun!

73, Meir WF2U
Landrum, SC

⁣Sent from BlueMail ​

On Sep 22, 2019, 7:09 PM, at 7:09 PM, Al Klase <ark at ar88.net> wrote:
>Hello Meir,
>
>I shudda know you'd have a handle on this equipment.  I suspected the 
>system was a GRC-19 equivalent, but didn't dig in too deep.
>
>Can you share any insight on the red and blue dots on the main tuning 
>dial, that correspond to dots on the white placard?  I'm thinking 
>presets, but haven't puzzled it out.  The levers on the knob just seem 
>to lock the tuning.
>
>If we can find a connector/cable in Europe, I guess it's worth the 
>trouble,  It's a cool RX.
>
>TNX ES 73
>Al
>
>On 9/22/2019 5:57 PM, Meir Ben-Dror WF2U wrote:
>>
>> I have the receiver, and its power supply as part of the whole 
>> Czechoslovakian RM 31-M-a (Trinec) station, with the RS41 
>> transmitter,  its power supply and the antenna tuner (all NOS, 
>> manufactured in 1968, except the receiver which I brought back from 
>> Hungary several years before I got the rest of the station). The 
>> station is the mission equivalent of the US AN/GRC-19. The RS41 
>> transmitter puts out 100 W AM/CW/RTTY, and runs off a 220/240 VAC 
>> input power supply. I have the manual of the whole system in Czech, 
>> but I also have a complete technical description of the R-4 receiver 
>> in Hungarian (I speak Hungarian, but never translated it to English).
>>
>> Unfortunately I don't have a spare receiver-to-power supply cable
>that 
>> I could help out Al with. I suggest to try to find automotive spade 
>> lugs that may fit the connector contacts as a substitute. If There is
>
>> a Czech ham I was in contact with a few years ago who helped me out 
>> with getting some other surplus parts, I'll get in touch with him and
>
>> ask him to try to find a cable. I also suggest to try to find the 
>> receiver power supply, it works off 12 VDC for vehicular use or 
>> 110-120/220-240 VAC .
>>
>> The receiver otherwise is a neat receiver, stable, although the audio
>
>> is slightly anemic as all the tubes (easy logistics) in it are
>6BA6's, 
>> including the audio output.
>>
>> Good luck Al,
>>
>> Best 73, Meir WF2U
>>
>> Landrum, SC
>>
>> On 9/22/2019 2:54 PM, J Mcvey via MRCA wrote:
>>> That's a might fine looking communist radio you have there!
>>> I should be so lucky to have such things thrust upon me!
>>>
>>> On Saturday, September 21, 2019, 8:03:15 PM EDT, Al Klase 
>>> <ark at ar88.net> wrote:
>>>
>>>
>>> http://www.ar88.net/vid/Woke.m4v
>>>
>>> This is a Czech R-4, made by Tesla, with Hungarian panel markings.  
>>> It was forced upon me at the Kutztown Antique Radio meet yesterday.
>>>
>>> Do I have any chance at all of find a connector for it?
>>>
>>>
>>>
>>> About 3" overall.
>>>
>>> 73,
>>> Al
>>> -- 
>>> Al Klase – N3FRQ
>>> Jersey City, NJ
>>> http://www.skywaves.ar88.net/
>>>
>>>
>
>-- 
>Al Klase – N3FRQ
>Jersey City, NJ
>http://www.skywaves.ar88.net/
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