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Tactical military mobile radio VRC 4622, 30 to 80 MHz by Philips Magnavox

Tactical military mobile radio VRC 4622,  30 to 80 MHz by Philips Magnavox



what we have here is a military vehicle radio model PRC 4622 VRC 4622 it consists of a mounting mt 46:20 a transmitter receiver model r/t 4600 and a loudspeaker control unit type AF 46:20 it was made by Philips Magnavox and it's actually pretty recent and this model is still used by militaries around the world the radio covers 32 here at thirty to seventy nine point seventy nine point nine seven five so almost 80 megahertz 30 to 80 megahertz and it does that in 25 kilohertz steps and of course that covers the ham bands I have it on the 52 to 25 I will test it at that frequency in a minute now quick let's have a quick over look over the controls for this radio probably easier when we turn it on all right now what we have here is volume control for both that handset or the headset as well as the inter-community here is a separate volume control for the speaker speaker can be turned off we have three power levels for the radio 2 10 and 30 watt so I'll show you that in a minute here we have a combination switz this is another way to turn it off here we have the swells off so this is basically a pass-through speltzer's off audio is active this is what I call the hem squelch normal carry squelch so when an external signal what to do when an external signal comes in from my user yeah wonderful it will kick in this is a tone squelch this is military tone squelch military uses 150 orts tone which is not compatible with normal PL tones but if you have a POC 77 for instance that uses the same tone squelch the nice thing about this radio is that you actually can turn that off and go to normal carrier squats the PRC is 77 cannot do that this is a mode where the discriminator filtering the pre emphases that the emphasis is turned off this is to work with digital equipment like voice encryption and digital transmission methods so then this position would be used and this is a position where we actually have the dial lights visible so in high mode if you want to use it for a ham radio you would obviously use it in normal carrier squelch mode and that's basically all there is to it there is obviously in an output for peripheral equipment that's not used right now so this unit can be part of a larger configuration but the way you see it here it is a standalone transmitter receiver unit the fer c 46:22 this is where the microphone or the tailor mic goes this is where power input goes at the radio works of 22 to 32 volts and that's kind of an inconvenience in most vehicles so I'm using it with this DC DC converter that converts I think 8 to 18 volts to twenty six volts regulated and that works very well so you know you could actually run this whole installation from a dirty power supply and this unit makes it a nice clean twenty six holes regulated works perfect so you can use it in a normal 12 volt car system or if you have a 24 volts military vehicle you can obviously use it with the standard cable that comes with it this is the power cable which is remarkably flexible and that supplies the radio with the 26 volts in this case let's have a look at the modulation and the receive capability of this radio now power levels I already told you it's 210 or 30 watts I have a bird watt meter here but that element only goes from 2 to 30 mega so what I can do is turn the radio to 30 megahertz by the way the radio has a motorized pre-post selector so it takes a while to get there there is an RF pre-post selector to make sure that these radios can work in closed frequency facility you have multiple radios of the battle for battlefield so they don't interfere with each other anyway we have it now at 30 point exact 30 megahertz exact and I can show you the power levels this is this is low power it's a little bit more than 2 watts full scale us right now 50 watts so two and a half once this is medium power we're having a little bit more than 10 watts I think this meter is a little bit optimistic this is full power and it shows 50 watts but that cannot be correct I think it's more like 40 this meter is a little bit on the optimistic side but as you see it gives up good powers now the power that we have the current that you see here from this 12 volt power supply is about 10 amps in that case of course that's with the 12 volt source that means that the output of the regulator is the DC DC converter is about 5 amps maybe a little bit less because the efficiency of this device is about 80% I think so you see that works quite well let's go back to our hand frequency and see how the modulation sounds 1 2 3 all right I have it on the dummy load if I put it in the antenna a little bit bacon power one two three four wives we're now in the antenna okay one two three four five this is the VRC at 46 22 good modulation and we're going to one two three four five this is the Yi so one two three four five no if I go 5th 2015 law itself nothing coming through and now we're back again radio is digitally synthesized digital synthesizer in here the radio is quite a hard work and the inside is modular to build up very well constructed and as you see it works very well you see the two modules transmitter receiver mounting and of course the intercom unit and are all disconnected and show you the rear of the radio but this one is nos new old stock it was never used this was never actually installed an enemy military vehicle it's like brand new here we see the reactor radio as you can see we have a power supply unit the regulator that's what you see in the back here and that is a PP 46:21 here we have the power amplifier unit which is the I don't know if that comes out visible there is a 4,600 a power amplifier and that is basically a 30 watts power amplifier 30 to 40 was interconnect cable between the two it is possible to connect it to a field telephone 600 ohm lines we have here another interface connector to interface with additional peripheral equipment were necessary we have this is a loop through you can hook an additional duplex filter in between this here if more adjacent channel rejection is needed and what you see here is the actual antenna output for the amplifier the 30 watt output that is the rear of the radio really big heat sinks there's no read of the heat there's really a professional piece of equipment all right that was it the VRC 4646 22 excuse me the military radio frequency modulated 30 to 80 megahertz and 25 killer steps and still in used by a melon many armies today this particular one was used in jeeps and larger military vehicles there was also a version where this unit here the base unit could be used in a manpack configuration and that's not what we have here because here we have the high power version with the 30 watts power amplifier plugged into the back thank you for watching this video


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