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Rx Tx relay sticking
#rx
#cw
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Hi Chuck,
If the relay is truly sticking, then replacement would be the only option.? If by "sticking" you mean that it will not go back or is delayed, going into receive mode after transmitting then it could be a number of problems or settings. Would you please give us more details on what is happening that you believe the relay is sticking?? Include the mode of operation; SSB or CW.? Also please let us know if this is a new developemnt (it worked fine before) or if has never worked correctly.? Finally, please include the BITX that you have including the version (for example ?BITX v6 or Easy Bitx v1). 73 Evan AC9TU |
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It is likely caused by RF getting into the radiuno.
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Check your wiring and shorten long wires and use a shielded coax for your output to antenna. If it is V6 then the antenna may not be OK. Raj At 20/05/2021, you wrote:
Is there a fix for the Rx Tx relay sticking? |
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I have had three of them fail. Also have had the control circuit fail to switch because of RF on the control line.?
So depending you should either replace the relay. If it is sticking you can sometimes tap on it with a screwdriver handle and get it to open. If it opens I would say sticky relay If it is rf start putting common mode chokes on things.Start with the antenna then try a small one on the PTT and elsewhere till it starts working. I doubt if it is in the electronics.? -- 73 Dave |
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I seen another person on here had a similar problem and he tapped it and it worked. I have tired tapping the relay and it will reset. when that doesn't work I key the mic or the key and turn radio off then back on it seems to work. Evan It happens with ssb or cw. When I first turn it on it work for a while but then it will happen. the radio is working normal in the beginning then there nothing come over the speaker when i unkey the mike or key. if I keep keying the mike the watt meter shows output. but there is no receive signal. I running v1.20 on the the display.and I set the tx rx delay to 1. yes the radio worked fine. I was concerned when it heated up I was doing some cw but it seem to work proper, I have over 200 contacts logged in FT8. I was working fine . Chuck |
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Chuck? I have not experienced any relay sticking problem with my uBITX V3, but have seen it happen in other equipment.? Have you changed the relays as part of an upgrade, or are you using the original relays? What are the symptoms of your T/R relay sticking? Many on this forum have way more experience than me, so maybe they will have a cure readily available. Arv _._ On Thu, May 20, 2021 at 5:56 AM Chuck Eglhaut <ceglhaut@...> wrote: Is there a fix for the Rx Tx relay sticking? |
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Chuck,
From the symptoms you describe, I would start with replacing K1. The fact that tapping on it allows it to reset suggests it is a mechanical issue. I found a sucking desoldering tool that worked great for the 2 v4 relay sets (6 total) that I needed to replace for the harmonic suppression fix.? This is the tool that I found to work the best: The thing is to compress the bulb before applying it to the pin and pad, let set for a few seconds then release the bulb.? It took two or three times on each pin to clear out the solder enough to free the pin.? I clear the tool by pumping the bulb over a cardboard box to catch the removed solder.? There were no board tabs damaged. 73 Evan AC9TU |
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All,
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If you're serious about desoldering things, the tool to have is the "Edsyn Soldapult". You heat the joint with your soldering iron - when it melts, you plop the tip of the soldapult right on it, push the button, and *WHAM* - clean joint. I have desoldered thousands of joints with those things, and IMHO there is nothing better. Get the real one, not a knockoff. - Jerry KF6VB On 2021-05-20 14:48, Evan Hand wrote:
Chuck, |
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Jerry,
I have tried both the stand-alone tool like that as well as one built into a soldering iron.? I have better luck with the bulb.? It seems to always take more than one pass, and the bulb is a simple pump clear over the box and then press and apply.? Quicker than the reloading of the spring pump each time. Your experience differed, and that is OK. To each his own. 73 Evan AC9TU |
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The Ungar desoldering iron also works well
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Gerry Sent by the Thunderbird On 2021-05-20 5:12 p.m., jerry@... wrote:
All, |
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Chuck -- after my second TX relay failed, I installed a socket.? The socket is a bit easier to install, and once done, you can swap at will.?
It is a testament to the uBITX utility that we even have this issue.? Design life is .5m flips, with a lot of variability at the individual part level - they cost? a buck more or less, so what do we expect?? I ran WSPR 24/7 for a few years with 20% TX duty on my beloved Franken BIX. The number of relay operations adds up, and right on spec, the TX relays gave up their ghost.? RIP says me.? After attending a 12 step WSPR detox clinic, my relays are now having a normal duty life and I expect them to last as long as I do.? Don Reformed? WSPR Junkie. Km4udx |
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Don, where do you sign up for the WSPR detox clinic? I may need that as well. WSPR can be quite addictive. 73 On May 21, 2021, at 9:54 AM, Don - KM4UDX <dontay155@...> wrote: Chuck -- after my second TX relay failed, I installed a socket.? The socket is a bit easier to install, and once done, you can swap at will.? It is a testament to the uBITX utility that we even have this issue.? Design life is .5m flips, with a lot of variability at the individual part level - they cost? a buck more or less, so what do we expect?? I ran WSPR 24/7 for a few years with 20% TX duty on my beloved Franken BIX. The number of relay operations adds up, and right on spec, the TX relays gave up their ghost.? RIP says me.? After attending a 12 step WSPR detox clinic, my relays are now having a normal duty life and I expect them to last as long as I do.? Don Reformed? WSPR Junkie. Km4udx |
Raj vu2zap
_Dave_ AD0B
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