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Trying to fix a Syncal 2000 that has 'Err 5' when it switches on, it's a synth fault, caused by in my case the 10.9MHZ TCXO giving out no 10.9MHZ. I've removed it, fed 10.9MHZ from a sig generator, but still get ERR 5 , unfortunately the schematic I have for the synth section isn't like the actual PCB. The board is marked 713954 and 754875 ISS 1 if anyone has the relevant schematic that is for that PCB, i'd be most grateful, the DC voltages are all correct, I need to trace where the 10.9MHz goes after coming out of the TCXO, on the schematic I have it shows it going to to two 100pf caps, then off to ML11 and ML2 as REF A and REF B, but I cannot see those on my PCB!. And before anyone asks, NO DO NOT WANT TO SELL IT, I fully intend to get it running for my own use. Tony

Hi all – Thanks for adding me. Is anyone parting out a RA1772 or have one for sale for parts? Thanks Mike

Hi, All, Is anyone parting with a Racal PRM.4021, ideally with at least a battery pack and a gooseneck? I'd be interested in a purchase, exchange for other radio equipment, or even to "rent" for six months against a deposit. I'd also be interested in one which is incomplete or irretrievably broken, if externally cosmetically nice. Bob

Hi, All of the equipment listed below is from the estate of G4DDN (SK). I have been asked by the family of G4DDN to dispose of this equipment, all proceeds will go to the family. Sensible offers please, bearing in mind the items are offered 'as seen' and untested (unless otherwise stated). If you have any questions, I'll try to answer them. Please send offers direct to me at ian.g0fct@... All items are located in Bracknell, Berkshire. 1. MA1720 TX Drive Unit, bottom & top covers missing, possible late prototype unit, with original Technical Handbook. 2. RA1771 (early model) converted to RA1772 HF Receiver with non-standard display and homebrew front panel board, top cover missing, partially tested, synth out of lock in upper bands, with a folder of documentation on RA1771/72. 3. MA197 HF Receiver Pre-selector and Protection Unit, L13, L20 and L29 missing, and in fair condition. 4. RA1784 HF Receiver (required MA1072 RX Control Unit), 1784/Q/S2/0/0/0/0, SN112, production unit, visually complete, in fair condition. 5. RA1784 HF Receiver (required MA1072 RX Control Unit), 1784/Q/S2/0/0/0/0, SN113, production unit, visually complete, in fair condition. Note: RA1784 receivers SN112 & 113 were used as development items for the HF Interferometer DF System (RDF3210) and have had reversable modifications to their 2nd IF AGC circuits. 6. RA1784 chassis, no cosmetic front panel, mostly complete, 1st Mixer, ISB IF and Filter boards missing. 7. MA1961/A Antenna C/O Unit, SN066, visually complete and in good condition, with original manual (in French) 8. BCC567HG Vehicle Interface Unit H.P. SN14718 MOD STATE 1. Visually complete, in good condition, untested, includes a spare PA Module (populated PCB) 9. MA1103 FSK Tuning Indicator chassis including some internal boards, no cosmetic front panel, with Racal Test Dept documentation (2 off, one more complete than the other). 10. MM610. RF section of RA1781 (HF Receiver). No front panel, designed to be remote controlled only (needs MS611 or equivalent control board). Mounted in a test/assembly frame (heavy) (2 off), some original Racal Test Department documentation. 11. MS445 Meter Panel Assembly SN 475, possibly part of TA1860 HF Power Amplifier 12. RA1778 Front Panel Assembly including Front Panel Board, some parts missing. 13. 2 off 19 inch 3U slip case in Racal colours, not in perfect condition Cosmetic front panels without handles, some in original wrappings for: 1. MA1720 (4 off, 1 with slight damage) 2. RA1778 (2 off) 73, Ian G0FCT

I recently obtained a RA1792 receiver for next to nothing. Physically its in good condition and I've gone through the routine of replacing a number of tantalum capacitors and now all voltages are up and running with nice white noise coming out of the speaker. Then on to the A6A2 microprocessor board which was fortunately undamaged. Nevertheless I cleaned it and replaced the old NiCad battery with a new NiMH one. All connection have been checked multiple times. Still, However, I get a display of either all zeros or a string of random digits/characters. I pretty sure that the A6A2 board is OK. So at this point I was stumped. Until I disconnected the A6A2 micro board and tried booting up again. I expected just all zeros but was surprised to find that the results are exactly the same as with the A6A2 connected, i.e. sometimes all zeros and sometimes random numbers/characters. Is it possible that the fault could actually lie on the A6 or A9 front panel boards themselves? and disable the microprocessor? Has anyone had any experience of this and where to start looking? Thanks Carly

Syncal 30 TR 40 PNP 5V switching transistor case 98 deg C ! Just a question, is this normal for TR40 switching transistor in the 5V psu, to run VERY Hot ? sets working normally Tx/RX - 98 deg C ? is this normal? {max device junction 200 C] Q what is the most upto date device number fitted ? The set has 2N5322 fitted Ive parts list that show 2N4037 and PDF cct showing 2N2905 Each look very similar - Ideas ? Tnx- Graham

The MA 4926 Interface unit is primarily intended to interface between Racal equipments and the KM P series of ship communications equipment. Question is what is the KM P series of equipment ? Any help appreciated. Jeff G8XXI

Hi all, Does anyone have a pdf of the user manual for either the Syncal 30 and/or Squadcal they could share with me please? All the best, Martin G4NCE

TTL Texas/Signetics Equivalent Hi Can anyone confirm TTL Programable divider Binary counter TTL SN74LS197N is pin compatible drop in replacement for Signetics N8291A ? Similarly, the /LS196 Decade version ? Tnx 73-Graham G0nbd

Hello! any information about this radio? looks like a normal VHF or UHF radio but it sais on the tab SECURABLE REMOTE CONTROL UNIT thanks!

Does anyone have a circuit diagram for the MA4232 charger, part of the 4230/4231 high speed morse set up? I've been working to fix some MA4230 units and the charger seems to turn itself off on some of them. Fully charged maybe? My manual for the 4230/4231 set up mentions the 4232 but has no information on it. Thanks, Dan ac6ao / g3ncr

Dear All Happy New Year! I recently bought a Plessey HF receiver model PRS 2282A unfortunately is faulty as deaf on shortwave bands , works fine on AM ( MW band) on SSB I can tune only very strong stations . Does anyone have any extra modular spare ? Thanks for any support. Br Claudio UK

Happy New Year to All I would like to buy an MA3751 or 3752 and spare modules If anyone has a unit for sale or knows of a source, please let me know Kind regards Richard

Dear fellow radio amateurs, I am the owner of about 6 x PRM4515L’s which have been refurbed and repaired. I’m also fortunate enough to own a handbag programmer, 3 battery conditioner chargers, ECUs and SMTs alike however the one thing I’m surprisingly short of is batteries. I have a few primary cells that are unissued and a handful of secondary Nicads. Problem is that of the 5 or so secondary cells that I’ve tried to disassemble to re’cell have always just crumbled. Most of the time they are also potted and a nightmare to break out. I know that the internals have a diode and a thermistor however the wiring is super complicated for something so very simple. Does anyone have a correct schematic and values of the diode and thermistor as good clean secondary cells are very, very hard to come by. Many thanks, kind regards, De Spence M0STO