Radio Oddities # 798

[Wire Weasel]

Here's a repeatable recent occurrence here at the shack.

Older style RCI 2970 as a base. Computer next to radio a few feet away.


I wear glasses for distance vision. Have to take them off for reading or using computer. They are those Twist-O-Flex frames made from titanium. Non-magnetic. I also take them off at my electronics workbench when doing soldering or other close-up work.... all kinds of wires and stuff running around so the glasses may have picked up an electric charge of some sort...but not magnetized.....


So recently, when taking these glasses off, if I set them down on top of the radio there is a "pop" noise out the radio speaker. And 3 times now in the last week if I set the glasses there the receive completely shuts off. Radio will still TX and signals are present on the meter...but no RX. No fiddling of any kind will restore RX. Turn radio off and come back several hours later and it will work again.

I can otherwise tap or hit the top of radio with my with hand and nothing....no effect. RX only acts up if I set the glasses on top.

WTF ??

 

[fnkycoldmedina]

have you tried this with an external speaker hooked up?
maybe its effecting the coil in the speaker?
its odd for sure .

why not just not set the glasses there anymore?

 

[W5LZ]

I really doubt if your glasses are the cause of whats happening. No idea what it could be. You think your radio may be having visions? Maybe you scared it?
- 'Doc

 

[Wire Weasel]

have you tried this with an external speaker hooked up?
maybe its effecting the coil in the speaker?
its odd for sure .

why not just not set the glasses there anymore?

Uh....yeah. I'm not setting the glasses there anymore. lol


Nothing to do with external speaker. Plug & unplug it...turn radio off & on....nothing will help except for turning radio off and trying it again several hours later.


Just an oddity to report

 

[fnkycoldmedina]

Ghost in the Machine {GitS vs I, Robot} - YouTube

 

[dxhound]

I would say check the grounds on the ta7222 audio amp. Its possible that you have enough static charge that if one of the grounds is loose, the static charge is popping the audio amp and its droping the gain a result. Radio cools down and the connection is fine until the next arc creates a high impedance bridge......Just a guess.

 

[dxhound]

On a second thought as well. Check the negative DC input. If your radio is relying on the ground through the coax, its likely that ground is not a very good one. see if radio turns off when you remove the coax. So the static shock you deliver to the case could momentarily raise the entire ground system to a couple thousands volts. That would cause the processor and other IC devices that require a fixed ground to not latch properly internally. I know these radios have two seperate ground systems, a chasis and DC ground, But those small .01 picofarad caps arent gona stop a couple kv from jumping into the DC ground path.

I would DEF check ground issues first!!!

 

[Wire Weasel]

TNX for the tips