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HI Pete, Thanks for the info. Much appreciated. Jeff

See attached. Never sold well and project went by the wayside. Fitted with ANR. Would normally control SPR and PRR radio systems of various types and manufacturers, interface to the headset and the

HI Dave. Put Racal acoustic RA6000 Talon ptt in your search engine and you should find some info.Basically it's a devise to control 4 different radios by one person. Hope that helps? Jeff RACAL

I am a bit ignorant of Raycal stuff. What is this item? Dave KC3AM

Group. I have for sale 3 of the above items for sale, these are new old stock asking ?33 each. plus pstge Jeff G8XXI

Folks, see my previous reply to this thread.?? That was correct because the set uses a linear PA - not a hi-level modulated PA. 73s Richard G7RVI

Thats not quite right , the residual carrier should be lower than peak-out , as the pa is linear, its presented with a generated spectrum, by allowing carrier leak through , the carrier side band

That's simply? because there is no phase locked carrier insertion oscillator in Am mode? , the detector carrier is derived from the clipped off-air signal. if the carrier fades out, then Thers

Ian, Yes, I also cut my amateur teeth on various VHF PMR radios, with sometimes quite fiddly adjustments to get the modulation right, and adding to the power output, with an increase in PA current on

Ian, its due to the inter-relationship between CW and AM.??? The 20W you mention will be CW only.??? On SSB you will get 20W PEP.??? On AM you will also get 20W PEP. But AM is not normally

Many thanks to Alan, G8LIT For his enlightening reply ... Downwards Modulation. Wow! It must be at least 45 years since I last heard that term. Being first licenced as GM8LWR back in 1976, when most

Running in AM linear mode you will need to drop the carrier to 1/4 peak power to allow headroom for positive modulation peaks. Frank WA1GFZ

Ian, My experience of repairing a 931, with failed PA’s was to try a pair of PA devices from a working PRC-320 back panel. They just about produced 20W, as the drive was slightly down from the

Hi, I currently have on my bench a Racal Syncal 30 aka TRA931. I'm currently involved in looking into alternative PA transistors since good 2N5070s are nearly impossible to source these days. I

I don't think so. The one I have in mind had a number of filters (six?) switched by crystal can relays controlled by a data cable from the radio. It was over 40 years ago ... -- Mike G8GYW

Is that in any way similar to the MA-4015? I have one of those, Tone G7TXU

Does anyone have one of these, or pictures of the inner workings? I pretty certain I worked on the design of this unit but can't find any information online to jog my memory. -- Mike G8GYW

Many many thanks Dave, that's fantastic news. I can now put it to work rather than just have it sitting around looking pretty. Maybe it will work nicely with crossband on 6 and 4 metres. Please excuse

Hi Tony I take it the unit is an MA4072 being the filter unit. It is designed to go between the 967 and the 970. 8 watts maximum is the spec. There is also a DC path to operate the MA972 antenna

Hi chaps, I've just received one of these 6 band VHF filters today. It physically bolts onto the TA970H VHF RF amp and also the MA989/E frame. What I need to know is whether it can handle the TX power