[ICOM] 706MkIIG VHF Xmit Problem.

[gfiber at comcast.net]

Gary,

Could be as simple as power cord RFI leakage and when you moved the power cord back from the 30 amp supply it was reconfigured so RFI is no longer intruding into the old power supply. 

Also could be a voltage drop and the terminals are tighter now that you reinstalled the power cord onto the old power supply.

Would have been interesting to had a voltmeter attached where the power enters the 706 and see if the power supply was taking a nose dive when the 706 shut down.

Gary K8IZ

-------------- Original message -------------- 

> Thought I'd follow up on the "resolution" to the below problem that I 
> posted last week. I hooked the radio to a dummy load and got the 
> same problem. While on the dummy load I hooked the radio to a 
> different power supply (30 amps). Still couldn't transmit on 2m 
> without momentarily shutting of the radio. Temporarily defeated I 
> hooked the radio back up to the original power supply. For chuckles 
> I keyed the mike. Lo and behold, the radio worked just fine on 
> 2m. Why? I don't know. I'm not ignoring my good fortune..hi..hi. 
> 
> Thanks to those that offered suggestions. 
> 
> 73, 
> Gary - W6GVS 
> 
> 
> 
> I've had a 706MkIIG in my car for a couple of years. Since I don't 
> travel in my work anymore it was overkill so this last weekend I took 
> it out. I set it up in the shack. It transmits fine on HF and UHF, 
> but now won't transmit on 2 meters. Whenever I key the mike the 
> radio shuts off momentarily. Kind of like it does whenever you have 
> high SWR on HF. I've tried a couple of different 2m antennas with 
> the same result. The odd thing is that it will transmit on UHF with 
> the 2m-only antenna without shutting off. BTW, I had a tri-band 
> antenna on the car and the radio performed fine on 2m the last time I 
> used it there. I hope that it isn't a worse case scenario in that 
> the VHF final is bad, but when I look at the block diagram the UHF 
> side apparently uses the same final. Anybody got any solutions for this? 
> 
> Thanks. 
> 
> 73, 
> Gary - W6GVS 
> Dowagiac, MI 
> 
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