G4NSJ - HF Aircraft Transmitter CCT-5220 valve TX ATA/ARA Command Radio ARC-5
ฝัง
- เผยแพร่เมื่อ 21 ต.ค. 2023
- G4NSJ - HF Aircraft Transmitter CCT-5220. This is an American valve transmitter covering 5.3 to 7MHz. It employs two 1625 tubes in the power amplifier.
- วิทยาศาสตร์และเทคโนโลยี
CCT-52210 is a late production ATA transmitter, part of the Navy ATA/ARA Command Radio set, nearly identical to the Signal Corps (AAF) SCR-274-N. Early in the war it might have been used in almost any Naval aircraft, including fighters. By summer of 1943, they were being replaced in smaller aircraft by VHF command sets such as AN/ARC-1, 4 and SCR-522 (at least in Europe).
Excellent, thanks for the info!
very nice love the old gear
This is in a remarkable condition for its age and I was amazed at how clean it is inside, with the varicaps moving effortlessly. The lack of labelling on the front could have been due to a supply issue or they assumed a training standard was applied, regarding operational use. They must of had faith in the valve longevity too, so removing them would be a rare occurance.
It is in excellent condition. I’ll make another video once I get it working.
I suspect thats not the original front?
Could be 1943 found this on wikipedia
"RCA announced new miniature tubes in Electronics magazine, which proved reliable. The first ones, such as the 6J6 ECC91 VHF dual triode, were introduced in 1939. The bases commonly referred to as "miniature" are the seven-pin B7G type, and the slightly later nine-pin B9A (Noval)."
I remember the 88 portable 40MHz set which used direct heater B7G, i think that came out 1945?
Of course i did the stupid Battery HT on the LT and blew a dozen valves in half a second!
Never has a command TX but did have the command R25/ R26 and R27 receivers.
they were octal base
I had a friend who did the same thing on an 88 set. Thanks for the info. Cheers, Ray.
@@g4nsj I dont know anyone who had a 88 set whom didnt blow all the valves that way at least once, after that you can give yourself OCD checking the HT LT connections ;-)
Haha, indeed! @@phillipsmiley5930
That is a very lovely transmitter. I'm sure you'll put it to good use, Ray. Thank you for sharing. Your videos are always interesting.
Thanks. I’ll certainly put it to good use. I’ll make another video once I get it working.
Excellent stuff Ray, thanks for sharing this. It would be fascinating if you could make a project out of this to get it working, and video the work. I'm still learning, and your channel is a great source of information for me. 73's G1 VJG ( MIKE ).
Hi Mike, Glad you liked the video. I;all have a go with the TX and, hopefully, get it working. Cheers for now, Ray.
@@g4nsjRay, thanks for replying1 I do realise how much hard work goes into making the videos and I really appreciate your work.👍
@@CanadairCL44 thanks, Mike. It’s great to hear from you.
Good Day Ray, have you considered doing a video on differing radio concepts for non hams?
I've not yet done my foundation, but now at the young age of 56 I do go on the looney bin that is 11 metres, but I'm an avid short wave listener since my father bought me a Trio 9r59de back in 1978 when i was 10!!
Now i listen SW on a kenwood R-5000 and my favourite ham band is 40m ... theres always something going on!
So yes, your input and views would be interesting and worth looking at!
Hi Richard, that's not something I've considered but I'll give it some thought. I'll add it to my list of ideas! 11 metres is great fun! Cheers, Ray.
Lovely bit of kit, Ray - or at worst a very attractive door stop... 😁
Now, there’s an idea! 😂
"you can keep the Sistine Chapel, give me a 4CX250 anytime"
Thank you for sharing, Ray! Reminds me of childhood when my father used to come home with all manner of surplus equipment. Whatever happened to surplus shops....?
Surplus shops have gone.. such a shame. They will never be replaced.
It looks very well made .
A lot of US MOD equipment has limited labeling in case the aircraft grounded into enemy lines . I would imagine that the transmitter wouldn't be too heavy hence it's for aircraft , probably mostly constructed from aluminium ?.
Thanks for the info. It is mostly aluminium.
Very interesting. It will be interesting if you manage to get this TX going.
Hi Mike, I'll make another video if I get it going.
Getting it going should be easy? getting it going without going into self osc and / or shorting the PSU with all those old caps will be the hard bit
Nice to see you are prepared to bleed for your art Ray🤣 Can see a redirection of an aircraft out of Shoreham like in fools and horses when this gets fired up. 😂 Does look a nice set though. Would be good if you can get some additional use from it.
Blood, sweat and tears! Haha! Yes, I hope to get it working before too long. I need to buil;d a power supply for it.
@@g4nsj If i remember right? Command Rx used 250vdc HT and command TX use 500vdc on the anodes, originally provided by 28V dynamotors, but 12v ones were also available
@@phillipsmiley5930 Thanks for the info, Phillip.
Could have been a prototype. It looks mint. Needs to go to a US collector or museum. Whatever you do don't do the ham butchering on it!
It's certainly is in mint condition. There's no way I'll butcher it.
ham butchering? what an insult!
im thinking that connector looking thing in front might be a remote cable drive for making an adjustment. Requires external power supply.
Yes, you could be right.
Hi Ray.
I can see a qso on 5.317Mhz AM coming soon then maybe?
73
Ian G7HFS/PA3IKH
Hi Ian, Yes, of course that's the AM FX on 5MHz. I didn't think of that! Thanks. Cheers, Ray.
Be good if you can get it to work, Ray..
I'll do my best! I'm learning more about it every day.
ARC. Made by the American Radio Corporation?
Yes, I think so.
It looks like someone modified an ARC5 transmitter which had a rotary inductor and a VFO dial. They plugged into a rack that hooked up to a dynamotor supply rail. The tubs up front were not original for sure. Domeone looks to have done a nice job but not sure how they are setting the frequency (originally the VFO capacitor was under bottom & the sheilded "do not adjust" can housed the VFO coils.
Interesting, thanks for the information.
3:26 How about the top end of 60m?🤔
Yes, indeed! 👍
Classic American built not made in China like todays garbage. Also aircraft is on 109-137 MHz also AM mode. -73's
Yes, nicely built. It covers the HF SSB aircraft band around 6MHz. 73.
It might pull up to 7MHz 40M but it wont get to 118