|
Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment. |
|
Thread Tools |
7th Mar 2023, 7:54 pm | #1 |
Diode
Join Date: Jul 2022
Location: Brough, East Riding of Yorkshire, UK.
Posts: 5
|
Racal VRM4156 Control Head
Hi All
I recently acquired a VRM4156 - units only , no control head or connecting cable. Full designation of this unit is VRM4156B/W Fortunately the interconnecting leads at the rear are present but there is no DC power lead. I have not been able to find any circuit info. From what I have read it looks like a nice modern piece of kit with lots of options so I would like to try and get it going as I also have a compatible Racal ATU. Would appreciate some help with all or any of the above. Happy to pay the going rate for accessories if anyone knows of a source. I think the control box is either an MA4054 or MA4935 cheers/73 Richard G3VDE |
8th Mar 2023, 6:21 pm | #2 |
Octode
Join Date: Nov 2010
Location: Ross-on-Wye, Herefordshire, UK.
Posts: 1,648
|
Re: Racal VRM4156 Control Head
If no-one here has answers to this question, then you could try the Racal Radio email list on groups.io. I think you can access that here: https://groups.io/g/RacalRadio
Richard G7RVI |
8th Mar 2023, 9:04 pm | #3 |
Diode
Join Date: Jul 2022
Location: Brough, East Riding of Yorkshire, UK.
Posts: 5
|
Re: Racal VRM4156 Control Head
Hi Richard
Thanks for the suggestion. I am a member of the Racal group - I've uploaded 1 or 2 manuals but there isn't much on there re VRM4156 so though I would give this forum a try. Info on the later stuff seems like a closely guarded secret - presumably a result of the sudden death of Racal at the hands of Thales! If you (or anyone reading this) has any ideas please get in touch cheers/73 Richard |
9th Mar 2023, 12:28 am | #4 |
Heptode
Join Date: Feb 2008
Location: Great Barr, Sandwell, West Midlands, UK.
Posts: 584
|
Re: Racal VRM4156 Control Head
As you may have already guessed Richard the MA4054 controls the radio using data on 3 wires in the 12-way interconnecting cable (data, data enable and clock), so acquiring a control box is probably the only way to get it running.
I have the VRM4156 service manual, it is big and heavy, if there is anything specific you need at the moment drop me a PM and I will see what I can provide. Edit: I also have found a PDF of the tech manual for the MA4935... Martin G4NCE Last edited by Sparky67; 9th Mar 2023 at 12:34 am. |
10th Mar 2023, 2:43 pm | #5 |
Diode
Join Date: Jul 2022
Location: Brough, East Riding of Yorkshire, UK.
Posts: 5
|
Re: Racal VRM4156 Control Head
Thanks Martin - much appreciated.
I've had a look inside the 2 units and everything looks intact and in good condx apart from one of the boards which I'm sure is the right one having too many holes for pillars/fixing screws Think I've seen this before with Racal. Worth spending a bit more time on it, anyway! Think we might have spoken briefly in your Arqiva days. Will send you a PM Meanwhile just to reiterate if anyone reading this has a MA4054 or 4935 + leads they would like to sell please get in touch cheers/73 Richard |