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Help - IC-725 CW Break-in
- Thread starter HandKey
- Start date
Some rigs required the VOX button to be pressed as well on CW mode in order to run breakin. Try that and see what happens. I ran an Icom IC-735 and I think that is what I had to do.
Sounds like you probably have the manual for the rig, but if not, you can download it from http://www.rigpix.com/icom/ic725.htm.
The specific instructions are on Page 18.
Does the rig work in SSB mode with VOX? The VOX circuit is what operates the break-in function.
The specific instructions are on Page 18.
Does the rig work in SSB mode with VOX? The VOX circuit is what operates the break-in function.
I have a copy of the 725 manual as well as the maintenance manual but there isn't much mention about the break in function and the schematic is so small that I can't read the part designations.
I just tried the rig again this morning. Yesterday I had set the TX delay pot for short delay with the semi break switch on. Today when I powered up and pressed the key, the rig the T/R relay switched and the TX light came on. With key up, the rig went into RX as expected. I cycled the CW break several times into a dummy load and it worked ok and then after a short pause, the receiver didn't come back!
I cycled the power switch and the break function again worked but quit after a couple of CW cycles. I now think there may be a bad capacitor in the timing circuit?
Does anyone have a suggestion?
BTW, the IC-725 has PTT only. No VOX!
Thanks for your help...
I just tried the rig again this morning. Yesterday I had set the TX delay pot for short delay with the semi break switch on. Today when I powered up and pressed the key, the rig the T/R relay switched and the TX light came on. With key up, the rig went into RX as expected. I cycled the CW break several times into a dummy load and it worked ok and then after a short pause, the receiver didn't come back!
I cycled the power switch and the break function again worked but quit after a couple of CW cycles. I now think there may be a bad capacitor in the timing circuit?
Does anyone have a suggestion?
BTW, the IC-725 has PTT only. No VOX!
Thanks for your help...
Well I'll be darned. That's a surprise to me. At thsi point with the added info you may be on to something regarding the timing capacitor. If I get time later tonight I'll look up a schematic and see what I can find out.
UPDATE:
I have found that my CW Semi Breakin is now working as expected! I purchased this rig recently off eBay and I think it hasn't been powered up for a long period of time. My feeling is that some of the capacitors in the CW timing circuits needed to be reformed and after several hours of operation in the semi break mode things are back to normal
BTW I have found PDF files for the Operation and Service as well as schematics with voltages on the web. By resizing to 150% and using "Print Screen" I have been able to read the drawings!
Thanks for the responses to my post.
I have found that my CW Semi Breakin is now working as expected! I purchased this rig recently off eBay and I think it hasn't been powered up for a long period of time. My feeling is that some of the capacitors in the CW timing circuits needed to be reformed and after several hours of operation in the semi break mode things are back to normal
BTW I have found PDF files for the Operation and Service as well as schematics with voltages on the web. By resizing to 150% and using "Print Screen" I have been able to read the drawings!
Thanks for the responses to my post.
Either that or the switch was very dirty and repeated pressing of it caused it to make contact by rubbing some of the dirt and tarnish away.
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