icom ic 92 AD

[chook]

Hi Rob - you have stolen Adrians thread!However I have just checked my manual on the A22/E and you are in luck.Icom have incorporated a protection circuit (APC) to prevent damage to the output power amplifier stage by antenna mismatch in your model. (as long as it was working)Briefly as Alan has suggested check your battery under load. What happens is that when you are just listening to the radio it does not take much power (0.4 amps) but when you transmit you use up to 1 amp of power from the battery/power supply. This added current will cause the radio to do "weird" things if the battery cant supply the required power. (including the symptoms that you describe amongst others)If you are using the 12 volt battery from your gyro this can also cause problems if the wiring or alternator is suspect. I have seen radios destroyed because battery connections have had corrosion on them and also from poorly crimped connectors at the battery lugs.

[maulonir]

Hello Chook,Ive only ever used the rubber ducky aerial. The broken wire was inside the radio case and was connected to the centre of the 1/4 turn aerial plug. Time to send to a comms shop I think.Rob

[chook]

HI Adrian. I am reasonably familiar with the aviation Icoms but not your model. I fear that it originally came with NICAD batteries which are notoriously fussy about the way they are kept. It is entirely possible that you won"t be able to "rejuvenate" them if they have been sitting in a cupboard for some time uncharged.Good luck.In the meantime I will track some details down for your particular model and we can work from there. Keep us posted as to exactly what you do and what you notice no matter how insignificant you think it is.And for the reasons previously explained by Bish the input stage of your radio (receive stage) is quite different from your output stage (transmit stage) so that one can fail without affecting the other. Also the antenna can fail similarly where the weak receive signal can get through but the transmit signal can be attenuated and not get out. Radio is not a pure science! Regards....Chook.

[adrian_clince]

thank you chook - since i have had the gyro i havnt touched the radio side of things - what i was attempting to do was find the battery that came with the radio and bring it back to its handheld glory - my next idea was to put the rubber ducky back on and see if that changed anything - its good to know there are some radio guys about - next time i go flying ill have a go at a few ideas - i was thinking if you were able to receive then shouldnt you be able to transmit ? unless something has come adrift in the handset ... anyways i will keep you posted about my findings cheers adrian

[tonydenton]

ok chook still supplying user friendly info. I"m a bugger at over tightening things , even zippy ties. thanks.

[chook]

Yep Bish great advice.And similarly Adrian if you can do the same fault finding exercise as in removing your radio completely from your gyro and connecting a "rubber ducky" antenna and trying to test the radio independently of the aircraft then we can reduce the search area of your fault.Just to reinforce what Bish said about the antenna connection.The energy being produced by your transceiver (radio) when transmitting all needs to get sent "up the stick" (antenna). When radio techs test antennas they use a SWR meter which tells us how much of that energy is actually being sent up the stick. And generally if its not being sent out then it is being reflected back into your transceiver components (output stage) as heat. These components are usually designed to work just below their maximum ratings with everything working as it should so to overstress them with a poorly matched antenna just tips them over the edge into destruction.Your pre flight should also include checking these cables and antennas for corrosion, crushing of the antenna lead (coax), abrasion of the insulation where moisture can find its way into the coax which causes internal faults not generally visible and that everything is tight and secure. Again for those using plastic "wire ties" on

[bishoff7]

You may have just revealed the cause of the problem. If you have been trying to transmit with the wire to the antenna broken even though now you have repaired that problem the damage could be

[maulonir]

Hello Adrian,No intercom, just set up through a PTT box, and its the same problem on the machine or off. I did have a broken coil that was connected to the centre lug of the aerial, the retaining nut came loose and the connection broke. The radio guy at work advised soldering in just a straight piece of wire which I did however same problem still.Rob

[bones]

Incompatibility problems?I think that was the same problems I had with my first wife?Graeme."Incompatibility problems?"

[GraemeMonro]

My original problems which fit that description were headphone and Mic impedence problems/incompatibility.Incompatibility problems?I think that was the same problems I had with my first wife?Graeme.

[Disco]

My original problems which fit that description were headphone and Mic impedence problems/incompatibility.

[Waddles]

Guys,A bloke up here had similar problems with either an A22 or maybe it was an A24. Anyway, he tracked it down via Icom who advised he buy a new batter pack as the NiCads don"t last forever. It fixed his problem. Guess if you"re hardwired into the 12 V system, it"s not a problem as long as the current doesn"t have to go through a battery pack.FWIW.Waddles.

[Disco]

That ic92ad is an amateur radio.

[adrian_clince]

Hi rob , I was wondering if you was using the pa 200ik intercom with your handheld.

[maulonir]

Hello Adrian,I have an A22 and is doing exactly the same thing. Also the squelch needs to turned nearly all the way up now otherwise it"s all static. I"d be interested if you find a fix.ThanksRob