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This chapter will end with a "to be continued." I decided to swap CPU (controller) boards between my radios.? The warning tone went away.? So I swapped back and printed schematics to do some

Rather than a collection of status lines, this design uses a two wire data bus (IIC) along with port expander chips to get status from each module. So there is no specific pin on the CPU which could

Peter - at Repair Technology we specialise in repairing and servicing all Racal Tacticom products. If you need a working Syncal 2000 to isolate your fault, please send me your address and I’ll loan

Wal Please write me directly Thanks StuartG0TBI stuartjmckinnon@...

Hi, If its the CPU itself generating the Hi-Lo tone irrespective of the synthesizer OOL state then It would appear that the CPU may have a permanent 'on' signal on the CPU input pin which monitors for

I have two of these radios. Both came with cracked LCD cover plastic and missing segments. One of them I converted to a new dot matrix LCD with high strength glass in front of it. That rather involved

http://w2hx.com/x/Racal/Syncal2000/docs/? ________________________________ Sent: Tuesday, September 17, 2019 2:35 AM To: Racal-manpacks@... Subject: Re: [Racal-manpacks] Digest Number

Following the discussion on the Syncal 2000, can anybody help me with: 1.? Technical manual - not user handbook 2. A pin out of the 7 pin output to the AAMTU?? (How many of the pins are used?)

I agree with your analysis to check the circuit that injects the error tone into the audio, perhaps it is being falsely triggered. ________________________________________ Sent: Monday, September 16,

I was finally able to get the radio to the bench. The hi-lo tone is always in the background low on receive, and loud during tune and PTT. According to the manual this is indeed the synthesizer out of

Looking for the whip to fit the PRM-4090 set. Ben.

Does anyone know or have info on: Racal Clip on Power Meter Type 80057A This clips over the coax. Ben

My local Museum of The Broads, at which I am a volunteer, has one of only two (we believe) completely restored Airborne Lifeboats in the UK. The boat has a strong connection to The Broads, since many

My display reports the voltage as measured internally and I’m using the pack directly connected to the radio so there is minimal drop. The lithium cells hold a good voltage throughout discharge,

Thank you. It must be something right on the edge of operation as receive works fine on all frequencies despite the warning tone. I will look for marginal decoupling caps. I will also warm up the set

Did you check the supply voltage at source i.e. battery terminals or actually at rig. Might be a significant voltage drop due to leads not thick enough or a poor connection.

Synthesizer is out of lock. Look for bad decoupling capacitors which might be fine in an air conditioned shop but will go out of spec in the hot sun. --scott

Hi Peter, from PRM4790 manual : Error Tone : continuous two-tone warning due to a fault. The synthesizer is out of lock. See chapter 4, Operator Maintenance. ATU Mismatch : A two-tone alarm repeated

Page 37. Warning tones! http://www.w2hx.com/x/Racal/Syncal2000/docs/Syncal_2000_User_Manual.pdf Robin G?GNE

Today I brought a couple of radios out into the field to test in actual conditions.? One was a Syncal 2000 which tested good in my shop but in the field had a low hi-lo alternating tone on receive, I