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Intermittent issue here. I have two FT857D rigs; one is pushing 10 years old, the other is only one year old. Both developed an intermittent condition with returning to full receive after ending a transmission, regardless of output power or mode (CW or SSB). Intermittent symptoms aside, when I stop keying in CW or let up off the mic in SSB, the receive rush noise may take several seconds (up to a half minute) to return; it almost sounds as if the AGC is kicking in. (I've checked the intermittent symptom on each rig with AGC Auto, Fast, Slow, and Off; no change.) Any or a combination of the three DSP selections don't affect anything either.
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Both the SWR meter and power meter on each rig or on the external meter show that the SWR is good; also the power output is right based on the power level (i.e. 100W or 5W). On the older rig of the two, the affected band is 17M; the newer rig shows the condition exists on 40M.
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I normally power the rigs from an Alinco DM-33OMV switching power supply, but both configs show the same intermittent condition even if I power them with a battery. (The rig is grounded to earth in either case.) The displays on both rigs show the voltage input is 13VDC, even when on battery; measuring the power supply voltage or the battery voltage using a DVM backs up what each rig's display indicates.
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My operating locations are well separated (Florida and Diego Garcia where I'm VQ920JC), and the intermittent conditions are identical at both locations. The rig is grounded to earth at both QTHs. The antennas used are resonant half wave dipoles, using different coax feeds. I've swapped out the feedlines at both locations anyway just to make sure there's no common mode effects or similar; no difference. I've also used verticals a few times without any apparent diferences.
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If it was only one of the two rigs, I'd figure that I'd done something to that particular box, but both are showing similar conditions (band notwithstanding). Resetting to manufacturer's defaults don't have any effect on the problem.?
Watsa? Tks/73, Jim, ND9M |
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Mike
Jim,
I have 2 857D's one an 07 build the other a 2010 build and have never run into the problem you are describing but for both to be doing the same thing would lead me to think it has to be something common, Question are you using and external tuner or antenna switch with the rig's if so could be something to do with that other than that I'd say you have an interesting problem and I will be more than interested in the finial solution to it. Good luck 73's troy ke4ska? |
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Hi Troy,
Thanks for the suggestion. I agree that the similarity in the problems between the two 857Ds (albeit on different bands) implies there's something in common. And yes, I have used a tuner with each rig at times. However, a lot of times I connected the antennas directly to the rigs, i.e. with no tuner or antenna switch in line, and the symptoms continue.?
BTW, when the RX quiets in this abnormal way, the S meter drops accordingly; as the RX audio returns, so does the S meter reading. It's as if the RX on that particular band (again, 17M on one rig, 40M on the other) does not get electronically muted when I transmit, thereby not protecting the RX.
Often, when I key the rig (CW or SSB) and let up, the RX kicks in normally as if there's no problem and it (both rigs) can stay that way for until the next key down but may remain "normal" for an hour, day, or week. And then it returns; the intermittent appearance is what makes me nuts!
Just for giggles, I swapped control heads and matched the Menu settings; not surprisingly, there's no difference.
Tks/73,
Jim, ND9M
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From: Mike <mjtdk@...> To: FT-857 <[email protected]> Sent: Mon, Dec 30, 2019 1:19 pm Subject: Re: [FT-857] Delayed RX after TX Jim,
I have 2 857D's one an 07 build the other a 2010 build and have never run into the problem you are describing but for both to be doing the same thing would lead me to think it has to be something common, Question are you using and external tuner or antenna switch with the rig's if so could be something to do with that other than that I'd say you have an interesting problem and I will be more than interested in the finial solution to it. Good luck 73's troy ke4ska? |
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Hi Troy,
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Thanks for the suggestion. I agree that the similarity in the problems between the two 857Ds (albeit on different bands) implies there's something in common. And yes, I have used a tuner with each rig at times. However, a lot of times I connected the antennas directly to the rigs, i.e. with no tuner or antenna switch in line, and the symptoms continue.?
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BTW, when the RX quiets in this abnormal way, the S meter drops accordingly; as the RX audio returns, so does the S meter reading. It's as if the RX on that particular band (again, 17M on one rig, 40M on the other) does not get electronically muted when I transmit, thereby not protecting the RX.
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Often, when I key the rig (CW or SSB) and let up, the RX kicks in normally as if there's no problem and it (both rigs) can stay that way for until the next key down but may remain "normal" for an hour, day, or week. And then it returns; the intermittent appearance is what makes me nuts!
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Just for giggles, I swapped control heads and matched the Menu settings; not surprisingly, there's no difference.
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Tks/73,
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Jim, ND9M |
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A single knob is used as the rf gain or squelch control, depending on a menu setting. It doesn't automatically select squelch in VHF/UHF or rf gain in HF. If the menu selection is for rf gain, then rf gain is manual and squelch is automatic in all bands. If the selection is for squelch, then squelch is manual and rf gain is wide open on all bands. Is it possible that the squelch setting (automatic or manual) is wrong for your rigs when in HF? If there is a hidden menu to adjust the automatic squelch level, I haven't run across it yet. Cheers and good luck, Bob VE3HIX
On Monday, December 30, 2019, 03:26:24 PM EST, Jim, ND9M / VQ9JC via Groups.Io <claryco@...> wrote:
Hi Troy,
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Thanks for the suggestion. I agree that the similarity in the problems between the two 857Ds (albeit on different bands) implies there's something in common. And yes, I have used a tuner with each rig at times. However, a lot of times I connected the antennas directly to the rigs, i.e. with no tuner or antenna switch in line, and the symptoms continue.?
?
BTW, when the RX quiets in this abnormal way, the S meter drops accordingly; as the RX audio returns, so does the S meter reading. It's as if the RX on that particular band (again, 17M on one rig, 40M on the other) does not get electronically muted when I transmit, thereby not protecting the RX.
?
Often, when I key the rig (CW or SSB) and let up, the RX kicks in normally as if there's no problem and it (both rigs) can stay that way for until the next key down but may remain "normal" for an hour, day, or week. And then it returns; the intermittent appearance is what makes me nuts!
?
Just for giggles, I swapped control heads and matched the Menu settings; not surprisingly, there's no difference.
?
Tks/73,
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Jim, ND9M
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Tks for your reply, Bob. I've got both the Squelch/RF-Gain menu option (#80) set for RF Gain use. BTW, even if the Squelch was the culprit, the audio would go completely silent once the signal (or noise floor) dropped to the cut off threshold.
When this intermittent symptom appears, there's definitely audio coming from the speaker (or headphones for that matter), but any signal(s) on freq is far reduced for several seconds before slowly returning to normal. The S meter's indicated value?drops and then rises at the same rate. If the 857 used a mechanical relay for T/R switching like in older rigs, I could easily believe the relay was sticky. Not the case with the 857 of course though. Tks/73, Jim, ND9M |
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Mike
Jim,
Well if you are connecting straight to the antenna with no tuner or switch/adapters in-line and you have done the master re-set/relay cleaning procedure with no positive results I am at a loss as to what the problem could be or what could have caused it in both radios. If no one on here comes up with a fix I would say contact Yaesu and maybe send one in to be checked out by them but whatever the fix I know all of use 857 owners will be more than interested in the cause and fix. Good luck 73's Troy ke4ska.? |
¿ªÔÆÌåÓýThe VOX is off? Some settings are per band. Sent from my Samsung Galaxy smartphone. I'm even smarter I spotter this crummy advert and my warped seance of humour has made it a mess. |
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Jim, By any chance do you use an amplified DSP speaker? I use one mobile with my FT857D and if I have it set too high on the filtering I get this issue at times. I just turn down the filtering and it goes away for me. Only a try at a suggestion. 73, Joe / AJ3O
On Tuesday, December 31, 2019, 09:55:15 AM EST, Mike <mjtdk@...> wrote:
Jim, Well if you are connecting straight to the antenna with no tuner or switch/adapters in-line and you have done the master re-set/relay cleaning procedure with no positive results I am at a loss as to what the problem could be or what could have caused it in both radios. If no one on here comes up with a fix I would say contact Yaesu and maybe send one in to be checked out by them but whatever the fix I know all of use 857 owners will be more than interested in the cause and fix. Good luck 73's Troy ke4ska.? |
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Thanks Paul. Menu Mode #s 87 and 88 address VOX delay and VOX gain respectively, not on or off. I've never been in the Service menu list; how do the band-selective VOX settings get accessed? Please point me in the right direction, and I'll check them if only for giggles.
Also the symptom continues to be intermittent. If there was a soft on/off setting that somehow got enabled, I would think that it would be a consistent symptom. |
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Tks for the suggestion, Joe. No, I'm not using an amplified speaker. I use only a set of plain vanilla headphones when my XYL is home and nothing if she's out.
This symptom appears to affect the RF side as opposed to AF. When it occurs and the signal is reduced, the audio output is still there; whatever signal is in the passband is reduced in strength for several seconds before gradually returning to its pre-TX level. I've experimented with all three DSP settings (DNR, DNF, and DBF) as well as the AGC settings (Fast, Slow, Auto, Off). The Menu Modes affecting DSP (#45 - #49) have never been changed and are verified to be at the factory default settings. 73/HNY, Jim, ND9M |
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Each band seems to have its own memory slot. I wondered if this is every band or a single band.
Another trick is to use the cloning facility from a known good radio and see if that fixes things. All the settings will get copied over. I used the RT Systems software before any change of settings and copied the lot to a new file called Original. With this in mind, I can mess with all the setting and not care if I mess up the correct settings. When messed up all I do is clone the Original file back into the radio. The radio is now again factory fresh. When I get the radio as I like it I again save the cloned file with the date in the name. I friend asked about all the settings so I emailed him the settings file (European UK for me). As for the service menu, I keep myself out of there. I suspect the service menu is cloned along with all the other settings in one big file. |
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my 817 and 100watt amp does something similar when I had the mic gain a little too high, it hangs for 20 seconds or so, turned the mic gain down and return to receive was almost instant, that was using the mh36 mic known for rf problems, with the std mh32 mic, the gain could be turned up no problem, so in my case it was rf getting into the mh36?mic holding it back from returning to receive even thou there was no tx light showing.
mick, sa4mdn |
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John P Liddell
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On Apr 5, 2020, at 12:55 PM, mick smith <michael.newbury@...> wrote:
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Hello Mick, |
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I had a similar issue and, as noted previously by other group members, it was caused by RFI in the mic holding transmit open. Here are notes from my maintenance log:
Peter |
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Hi Peter,
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Hello everyone, Re-soldering the relay contacts did not help and when listen to the noise and kick the relay, the noise become attenuated and come back within a minute or less. It looks like that there are some internal contact issue in this relay.? Just ordered from Conrad SY-12W-K relays? to replace them. Also found same problem on 15m band but this relay is working more stable, showing the same issue not always. Any case will change it also.? ? ? |
G4IJL
Michael Newbury SA4MDN