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Syncal 30 , fails to return to RX

Graham All Messages By This Member #4793 Syncal 30 , fails to? return to RX Started as? intermittent fault and is now? permanent , a plus point? , I suppose? Basically , TX and? Rx? are ok,? all? modes ,? the? problem is ,? once? TX has been? engaged ,?? on releasing the? PTT , the? set? returns to? RX , meter? shows the? battery? voltage? and there? is? slight? ?noise from the? head set?? But , the? RX is? actually? NOT working ,? Rx can be? recovered , by? powering? the? radio? OFF and? back ON ,? ? where? there? is? a? couple? of? beeps? from the? synth? lock ind , then? it works? normally ,? Not taken the? covers of? yet,? looking? to see? if this? fault is? a ''known''? ?condition and / or? any? pointers as? to? possible? cause ...? Initially? double? clicking the? ptt could? remove the? fault ,?? Rx audio? , during tx is? ?switched ?? Tnx - Graham? g0nbd
Stuart Mckinnon All Messages By This Member #4794 Racal Syncal 30's are notourious for sticking relays, try to get your relay cleaned with switch cleaner Stuart PA/G0TBI/P Den Haag toggle quoted message Show quoted text -----Original Message----- From: Graham <g0nbd@...> To: RacalRadio <[email protected]> Sent: Wed, 5 Feb 2020 22:52 Subject: [RacalRadio] Syncal 30 , fails to return to RX Syncal 30 , fails to? return to RX Started as? intermittent fault and is now? permanent , a plus point? , I suppose? Basically , TX and? Rx? are ok,? all? modes ,? the? problem is ,? once? TX has been? engaged ,?? on releasing the? PTT , the? set? returns to? RX , meter? shows the? battery? voltage? and there? is? slight? ?noise from the? head set?? But , the? RX is? actually? NOT working ,? Rx can be? recovered , by? powering? the? radio? OFF and? back ON ,? ? where? there? is? a? couple? of? beeps? from the? synth? lock ind , then? it works? normally ,? Not taken the? covers of? yet,? looking? to see? if this? fault is? a ''known''? ?condition and / or? any? pointers as? to? possible? cause ...? Initially? double? clicking the? ptt could? remove the? fault ,?? Rx audio? , during tx is? ?switched ?? Tnx - Graham? g0nbd
Graham All Messages By This Member #4795 Sticking, or the? driver? transistor , leaking ? ,? Powering the? set off? and? back on clears the? fault ,? may be? , held in ? , just hope the? fault? remains till? its identified ..? guess ,? identifying ,? what is? switching the? RX audio? would be a good? place to? start .. Had some? fun and game's? with? one of the? ?counter? re-set line , ztx? clamp? transistors ,? not? pulling to ''zero ish'' , staying up slightly .. causing? a pulsed? ?400? hz? fm? some time? back and the? last? /2? ?in the? pll ref line failed , doubling the? ref? frequency? ..novel? Tnx-G
gmb_uk2005 All Messages By This Member #4796 It sounds like the classic problem that I have fixed on many occasions, namely failing transistors. I have found many of the transistors used to perform logic functions and switching the relays seem to fail with strange faults. Clearly they had a bad batch! ? M0GXB
Graham All Messages By This Member #4798 Relay part number ? Ive? qty 3? relays? in the? set, one? on the? relay board? and two? on the? main? analog tx/rx signal? board the only? identification? on the? realys? is?? National? RS? 12V? ?and 611? ....Im seeing data? sheets for? RS-12V?? ?Electromechanical Relay, SPDT, Latched, 28VDC (Coil), Assume the? 611? ?is a? batch number ,? looks? to? of been? added to the relay? at 90 deg? to the? main label? Latched relay ,? possible cause of it holding in , due to? age? I wonder ? Are these the? common fault items ?? Tnx - Graham?
Graham All Messages By This Member #4799 Usual crazy faults , this was the only open frame relay? , contact's Rx 12v? switched supply,? 12v on set power on? zero during tx,? returning to? 2 v? on Rx ....... power set off , on , back to 12v on Rx ,? Cleaned contacts , normal service restored .... For now? G

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