Close up of a Yugoslav Cold War era radio | RP-2M

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HF radio receiver RP-2M, original military device in excellent condition, tested, correct, you get what you see on the picture, no antenna, no power
The radio receiver RP-2M was one of the first domestic transistor radios. It was produced by Elektronska industrija from Nis in the early 60's and built in its germanium transistors. The device is intended for receiving unmodulated telegraphy (CW) and amplitude-modulated telephony (AM) in the frequency range of the HF radio receiver RP-2M 2MHz to 12MHz. The receiving band is divided into three frequency ranges. It was powered by DC voltage from two dry batteries of 4.5V. The units of the JNA connection used this receiver as a stand-alone receiver or included in the Small Command-Staff Circuits (MCSK), usually for reception of the so-called. "alert wave".
The RP-2M receiver is a double superheterodine. The antenna signal is amplified in a two-stage VF amplifier and leads to the 1st mixer. The 1st mixer also provides a signal from a variable oscillator (VFO), which sets the operating frequency. The mixing product is 1.frequency (MF) at 1780kHz. The enhanced signal in the 1st MF amplifier is fed to the 2nd mixer and blended with a quark oscillator signal at 1500kHz. After mixing in the 2nd mixer, the signal is introduced into the 2nd MF amplifier operating at 280kHz. (Both MF amplifiers are with classic LC filters). From the 2nd MF amplifier, the signal enters the demodulator and with the help of the telegraph receiver (BFO), a controlled quark of 280kHz produces a NF signal, which is amplified in the low-frequency amplifier and played in the headphones.
The receiver is mounted in an aluminum housing partially resistant to water penetration. The set of receivers consists of: radio receiver, antennas (rod and wire), headphones and accessories for packaging and carrying. Origin: Yugoslavia.

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17 сен 2024

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Комментарии : 48

@alastairbarkley6572 2 года назад

Have you any comments about the internals of the set? Presumably it's a superheterodyne - most likely, single conversion, analogue VFO (rather than synthesised). Military didn't like fancy stuff back then due to the difficulty of repair and keeping it aligned and calibrated in the field. 2-12 MHz, AM/CW only - no hi-band HF/VHF FM (which the US was pushing hard onto NATO). It's a classic WW2 design - unremarkable electronics and extremely well made, robust, often waterproof mechanicals. Is the case aluminium? That would be very post-war. The WW2 western allies were desperately short of aluminium - US and British radios were often reluctantly, but necessarily, steel based.

@alastairbarkley6572 2 года назад

Oh, and there is no CW crystal filter - very WW2, as well. Nobody had discovered ladder crystal filters back then and the odd asymmetric response of single crystal 'phasing' filters required an excessive delicacy of tuning. The iconic US WW2 receiver, BC348 type, ended up having the crystal filter removed from the mobile tactical radios although it was retained for the base station implementation. As an alternative, can also improve CW selectivity by careful adjustment of the RF gain (which this radio seems to have) but you also need to disable the AGC at the same time - a facility this radio does not seem to have.

@M0SZT 2 года назад

Thank you for the information I’ve pinned in to the top of the comments. It’s great to have people who have the experience and technical understanding of these radios. It’s a shame it’s limited for many military radios

@CaptainK007 2 года назад

An excellent Cold War lurk, in the current world status we can go back to using them.

@AdamSWL 2 года назад

Lovely old set! Great to see it in working condition. Not something you see often. Thanks for showing Carl and I hope you can find out more of it's history.

@eduardopower5254 2 года назад

Wow what a beauty you got !!! Man that's my favorite subject Military radio more of this videos are greatly appreciated 😊👍🏼. I'm looking for a Clansman PRC 320 to buy. 73

@driverfilmsshortwavechannel 2 года назад

Nice to see an old set from the Cold war era. Hope to see some more of these!

@wfwtheradioguy3414 2 года назад

I quite like watching these videos about vintage military radio equipment. Hope to see more.

@k2rcb 2 года назад

Neat radio - thanks for sharing!

@mikesmithg0rfd356 2 года назад

always good too see something different. thank you

@radioactive8245 Год назад

Nice video, thanks.

@Tommyr 2 года назад

Very cool radio Carl! Interesting!

@jimtrussler9232 2 года назад

Great video. Please do some more as this was very interesting!

@jamesgrant3718 2 года назад

Please keep on with these Mil radios... Great presentation. Thanks! 73 DE KC4LGM

@chicken_schmitty6039 2 года назад

Hi Karl, Working on my Foundation Licence. Thanks for the videos. I remember in army cadets we use An/PRC 77 sets. Would love to get my hands on one. All the best. Keep up the good work.

@dxscotland5901 2 года назад

That’s a cracking lookin radio Carl and to think it can still be used now is brilliant! Take care 73 Gm4zji Chris

@temporarilyoffline 2 года назад

That's a great tour! That would be fun to play with.

@Subgunman 2 года назад

Nothing beats Green Radios! Thanks for the video!

@hectorpantalone3507 2 года назад

Muy bueno carlos 73

@thork0tjt515 2 года назад

Very interesting. Thanks Carl! 73

@Ploggy. 2 года назад

Interesting video Carl cheers 👍

@dougputhoff3215 2 года назад

Very cool….loved it

@arenaengineering8070 2 года назад

Thanks for the video!👍🏻

@oldfartonabmx2122 2 года назад

I remember as a kid in cadets we had the army radios, I think they were called "77 sets". would love to have one now!

@marinmilosevic7708 2 года назад

Ei- Electro Industrija , Nis, Serbia. Thanks, Marin.

@duanetrivett750 2 года назад

Carl i love that radio ! I am glad to find your Chanel i enjoy it very much . where did you find such a thing ? Thanks Carl 73

@M0SZT 2 года назад

Thank you

@alastairbarkley6572 2 года назад

Hi Carl. Interesting as ever. I think your comments about NATO and Yugoslavia aren't correct. Post-war, well from 1948, Yugoslavia sought to establish itself as an independent (i.e. not aligned to the USSR) Communist state but, Yugoslavia never joined NATO or applied to. William Park's "Defending the West: A History of NATO" (1986) makes no comment at all about NATO-Yugoslav relations. What DID happen was that Yugoslavia briefly received some 'Marshall Plan' financial support from the USA. Marshall money was offered to all post-war European countries to rebuild, including to the USSR (declined). The Marshall Plan was nothing to with NATO. Also, 'NATO' doesn't supply military equipment to non-members although individual NATO countries CAN do so on a 'national' basis - look what's happening about arms supplies to Ukraine at the moment. Furthermore, this RP-2M radio was manufactured in Yugoslavia and clearly not foreign supplied by the USA or anyone else. The only link I can think of is that this radio was vaguely designed for NATO compatibility; in other words, it receives on the frequency bands that NATO used and that there's a degree of interchangeability of components, batteries, headsets, mikes and so on. NATO was working then to standardise equipment across member nations (in reality, everybody just used US standards), it's possible that Yugoslavia had visions of actually joining NATO at some stage.

@Chris-KC3MLI 2 года назад

Great vid Carl! I have a PYE Compak 8 I’m looking to get up and running. (Just need a battery) It’s painted blue, apparently used in Bosnia for a UN Peace Mission.

@janezsvajgl 2 года назад

Nice ... 73 S51KV

@HelamanGile 2 года назад

Can you record like 20 minutes and put the recording up for sale would be perfect in a movie

@AliReza-zx8km 2 года назад

Nice.......................

@wayneskiba1237 2 года назад

Carl, very interesting discussion on the RP-2M radio, I seems like a very compact rig for use in the field. I was wondering if the set can be used for SSB phone? Thank you for sharing.

@decreasingmass4577 2 года назад

brilliant btw did i see that you had some music gear..

@M0SZT 2 года назад

Yes modular synths 🙂

@KD2HJP 2 года назад

Neat

@sbreheny 2 года назад

The language of the labels on the front of this radio look like Slovenian. Of course, that is one of the languages used in the former Yugoslavia but most Yugoslav military stuff I've seen uses Serbo-Croatian written in Cyrillic characters. Strange!

@crnimrki65 2 года назад

You're wrong. I was born and lived in Yugoslavia. I was in the Yugoslav army and used these things. Cyrillic was used in the Serbian part of the country and most of the equipment in the Army was marked in Latin. These inscriptions are not Sloven, the Sloven language is a little different.