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Cobra 29 unknown part
- Thread starter C_Rock55
- Start date
Best guess, noise toy or roger beep. Pretty sure it wasn't installed at the factory.
Uses a relay, so it is not a simple echo, this might be a "doorbell Ding-Dong" or Roger beep - with the relay to "hold it keyed" to send out the tone per delay using one of the many caps on the bottom side of the board.
The outline and package designs of some of the parts denote this is a pretty old board. Those caps one being an AXIAL TYPE STRADDLING a set of traces. The older trimmer resistor - colors used show a much older era...
So more than likely it is a noise toy Beep that uses a relay to keep the audio from it to the mic amp and out the final than to let the speaker roar it out, deafening the operator.
Considering the noise the thing could make - it would cause ringing and tinnitus amongst anyone whom would want to hear the confirmation beep tone you could make it generate.
The outline and package designs of some of the parts denote this is a pretty old board. Those caps one being an AXIAL TYPE STRADDLING a set of traces. The older trimmer resistor - colors used show a much older era...
So more than likely it is a noise toy Beep that uses a relay to keep the audio from it to the mic amp and out the final than to let the speaker roar it out, deafening the operator.
Considering the noise the thing could make - it would cause ringing and tinnitus amongst anyone whom would want to hear the confirmation beep tone you could make it generate.
Hook up some talkback and flip switches till you find it. On the ch9 switch maybe?
Im interested in what noise it makes.
Im interested in what noise it makes.
The capacitor that we add to in parallel for a lower-pitch tone appears unmolested. This one should have a fairly high-pitched single beep.
Whoever installed it didn't know how to shut off the beep in a civilized way. The instruction sheet says to put a switch in line with the audio wire. This gets you a "roger pause". Shuts off the beep, but not the unkey delay.
Seen in the second pic there is a diode at the far left center of the board with its long lead on the outer edge. You pull out the long lead of this diode from the board. Put one end of a wire in the hole it came out of, other end to the switch. The other switch wire gets one end lap-soldered to the loose end of the diode, other wire leading to the off switch. Shutting off this diode turns off the unkey delay.
And the beep.
73
Whoever installed it didn't know how to shut off the beep in a civilized way. The instruction sheet says to put a switch in line with the audio wire. This gets you a "roger pause". Shuts off the beep, but not the unkey delay.
Seen in the second pic there is a diode at the far left center of the board with its long lead on the outer edge. You pull out the long lead of this diode from the board. Put one end of a wire in the hole it came out of, other end to the switch. The other switch wire gets one end lap-soldered to the loose end of the diode, other wire leading to the off switch. Shutting off this diode turns off the unkey delay.
And the beep.
73
Could I get a copy of the instructions? I removed it but would like to reinstall correctly. It does have a switch hooked up to it but nothing worked when I originally received the radio. Thanks Craig
The layout and wire color code looks like this one.
And here by @nomadradio :
https://www.worldwidedx.com/threads/roger-beep-the-add-on-board-they-all-love-to-hate.262981/
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