FT857D No TX Power on all bands

Pasquale Stella · 2022-02-05T09:13:58-08:00

No TX Power on all bands While tuning a V-UHF antenna the output power dropped to zero. Now by pressing the PTT, on all bands the transceiver absorbs approx. 500 mmA from the power supply. IF filters

FT857D No TX Power on all bands

Pasky All Messages By This Member #52313 No TX Power on all bands While tuning a V-UHF antenna the output power dropped to zero. Now by pressing the PTT, on all bands the transceiver absorbs approx. 500 mmA from the power supply. IF filters can't be because they were replaced 3 years ago and then they don't produce this symptom. Please suggest me some solutions HB9IRB
Hanford Wright All Messages By This Member #52314 开云体育 Did you try the radio with another antenna or dummy load? ?Also check your coax center conductor to the outer shell of your coax connector to see if you have a short. ?Good luck.. Best Regards Hanford R Wright WA4LZC CCA# AC11-12590 y please pardon my typos. toggle quoted message Show quoted text On Feb 2, 2022, at 10:06, Pasquale Stella <hb9irb@...> wrote: ?No TX Power on all bands While tuning a V-UHF antenna the output power dropped to zero. Now by pressing the PTT, on all bands the transceiver absorbs approx. 500 mmA from the power supply. IF filters can't be because they were replaced 3 years ago and then they don't produce this symptom. Please suggest me some solutions HB9IRB
Joe - KF7MIX #52315 开云体育 For WFD, a club member brought a club-owned TEN-TEC in because it wasn't putting out any power on TX. They hooked it up to some test equipment and started diagnostics. Indeed, there was no TX power out on the expected frequency. After trying many things, someone finally realized that the radio was in split mode. It was transmitting on the VFO-B frequency. The TEN-TEC display simply wasn't definitive enough to make it perfectly apparent to people who weren't used to operating it. Sometimes it's the easy solutions... just sharing this story in case you haven't verified that the radio isn't operating in split mode. 73, Joe KF7MIX On 2/2/22 08:58, Pasquale Stella wrote: toggle quoted message Show quoted text No TX Power on all bands While tuning a V-UHF antenna the output power dropped to zero. Now by pressing the PTT, on all bands the transceiver absorbs approx. 500 mmA from the power supply. IF filters can't be because they were replaced 3 years ago and then they don't produce this symptom. Please suggest me some solutions HB9IRB
Pasky All Messages By This Member #52316 it would be too beautiful and simple if you could solve it as you suggested ....... a bit of optimism comes from the fact that the radio has 2 HF + V-UHF power amps and it seems impossible to me that both are burned at the same time. it is much more likely that the pre drive driving both power amplifiers has burned out. So I appeal to all owners of this radio who know of this rare problem. HB9IRB
Sean S All Messages By This Member #52317 I know practically nothing at all about xcvr internals but just wanted to throw out: T/R relay? toggle quoted message Show quoted text On Wed, Feb 2, 2022, 09:21 Hanford Wright <joh69@...> wrote: Did you try the radio with another antenna or dummy load?? Also check your coax center conductor to the outer shell of your coax connector to see if you have a short.? Good luck.. Best Regards Hanford R Wright WA4LZC CCA# AC11-12590 y please pardon my typos. On Feb 2, 2022, at 10:06, Pasquale Stella <hb9irb@...> wrote: ?No TX Power on all bands While tuning a V-UHF antenna the output power dropped to zero. Now by pressing the PTT, on all bands the transceiver absorbs approx. 500 mmA from the power supply. IF filters can't be because they were replaced 3 years ago and then they don't produce this symptom. Please suggest me some solutions HB9IRB
J.D. Barron All Messages By This Member #52318 No TX on all bands and the receiver works OK on all bands means that there will have to be some troubleshooting involved. First try a factor reset to see if something has been miss-set. After this you need to get into the circuits and trace the signal. It could a couple of spots in the transmitter chain as often FM might go a different path than CW, AM or SSB. It gets beyond troubleshooting over the internet fairly quickly and if you don't have the basic equipment and skills you might do more damage than good.
Steve Rosman KA2YRA All Messages By This Member #52319 Apologies in advance if this was already checked.? Does the radio show red light for transmit,? and what mode are you using? Only CW, PKT, or FM will transmit a carrier without modulating like speaking into the mike.? I have forgotten to check this more than once and saw no power output. Hope this helps.? 73 Steve KA2YRA? toggle quoted message Show quoted text On Wed, Feb 2, 2022, 1:25 PM Pasquale Stella <hb9irb@...> wrote: it would be too beautiful and simple if you could solve it as you suggested ....... a bit of optimism comes from the fact that the radio has 2 HF + V-UHF power amps and it seems impossible to me that both are burned at the same time. it is much more likely that the pre drive driving both power amplifiers has burned out. So I appeal to all owners of this radio who know of this rare problem. HB9IRB
Compton All Messages By This Member #52320 Is there anything plugged into the CAT or DATA ports on the rear? If so remove them and re test. I have seen where a Tiny Trak 4 was connected to my FT 857D and it stopped the PTT on the mic from putting the radio into Tx mode. -- Compton VK2HRX Sydney, Australia
J.D. Barron All Messages By This Member #52321 A very good question above was if the transmit indication was being activated. If the transmit indicator is not showing transmit mode then the problem could be in the PPT circuits either mike or internal switching.? A very pertinent observation there.
Giuliano Lauto All Messages By This Member #52322 If 500mA at tx is confirmed the tx chain has not power supply or tx bias. Start digging from this fact.
KE5EOT All Messages By This Member #52323 开云体育 Is it possible it was bumped into SSB mode and won't transmit until you talk? Randy (KE5EOT) ARRL, QCWA, ARES, RACES, ROWH On 2/2/22 8:58 AM, Pasquale Stella wrote: toggle quoted message Show quoted text No TX Power on all bands While tuning a V-UHF antenna the output power dropped to zero. Now by pressing the PTT, on all bands the transceiver absorbs approx. 500 mmA from the power supply. IF filters can't be because they were replaced 3 years ago and then they don't produce this symptom. Please suggest me some solutions HB9IRB
Pasky All Messages By This Member #52324 开云体育 Unfortunately, no carrier starts: When I press the PTT the red TX / BUSY light turns on and the fan starts, and I repeat it does not absorb any current from the power supply. Tested in all TX modes: SSB, CW, AM, FM, DIG etc. 73 Pasky HB9IRB Il 02.02.22 19:36, Steve Rosman ha scritto: toggle quoted message Show quoted text Apologies in advance if this was already checked.? Does the radio show red light for transmit,? and what mode are you using? Only CW, PKT, or FM will transmit a carrier without modulating like speaking into the mike.? I have forgotten to check this more than once and saw no power output. Hope this helps.? 73 Steve KA2YRA? On Wed, Feb 2, 2022, 1:25 PM Pasquale Stella <hb9irb@...> wrote: it would be too beautiful and simple if you could solve it as you suggested ....... a bit of optimism comes from the fact that the radio has 2 HF + V-UHF power amps and it seems impossible to me that both are burned at the same time. it is much more likely that the pre drive driving both power amplifiers has burned out. So I appeal to all owners of this radio who know of this rare problem. HB9IRB
Pasky All Messages By This Member #52325 开云体育 correct colleague, I too am almost convinced of this. the power amplifier will be in order but it is not receiving power. Unfortunately, I am not a technician and I do not have the necessary equipment ....... Pasky HB9IRB Il 02.02.22 22:12, Giuli Lauto via groups.io ha scritto: toggle quoted message Show quoted text If 500mA at tx is confirmed the tx chain has not power supply or tx bias. Start digging from this fact.
Pasky All Messages By This Member #52326 开云体育 Il 02.02.22 17:56, Sean S ha scritto: toggle quoted message Show quoted text I know practically nothing at all about xcvr internals but just wanted to throw out: T/R relay? On Wed, Feb 2, 2022, 09:21 Hanford Wright <joh69@...> wrote: Did you try the radio with another antenna or dummy load?? Also check your coax center conductor to the outer shell of your coax connector to see if you have a short.? Good luck.. Best Regards Hanford R Wright WA4LZC CCA# AC11-12590 y please pardon my typos. On Feb 2, 2022, at 10:06, Pasquale Stella <hb9irb@...> wrote: ?No TX Power on all bands While tuning a V-UHF antenna the output power dropped to zero. Now by pressing the PTT, on all bands the transceiver absorbs approx. 500 mmA from the power supply. IF filters can't be because they were replaced 3 years ago and then they don't produce this symptom. Please suggest me some solutions HB9IRB
Pasky All Messages By This Member #52327 开云体育 this may also be an option, but the relay switching noise is heard. Both from the PTT on the microphone, and from the PTT on the device Il 02.02.22 17:56, Sean S ha scritto: toggle quoted message Show quoted text I know practically nothing at all about xcvr internals but just wanted to throw out: T/R relay? On Wed, Feb 2, 2022, 09:21 Hanford Wright <joh69@...> wrote: Did you try the radio with another antenna or dummy load?? Also check your coax center conductor to the outer shell of your coax connector to see if you have a short.? Good luck.. Best Regards Hanford R Wright WA4LZC CCA# AC11-12590 y please pardon my typos. On Feb 2, 2022, at 10:06, Pasquale Stella <hb9irb@...> wrote: ?No TX Power on all bands While tuning a V-UHF antenna the output power dropped to zero. Now by pressing the PTT, on all bands the transceiver absorbs approx. 500 mmA from the power supply. IF filters can't be because they were replaced 3 years ago and then they don't produce this symptom. Please suggest me some solutions HB9IRB
Cliff Warrick All Messages By This Member #52328 This is a long shot, but I've had several issues of the the years with radios receiving but not putting out an RF power due to poor power cord connections.? In some cases at the power supply because the ring terminals were not soldered on and corrosion developed over time and in at least two cases because corrosion developed in the fuse holder.? This causes a voltage drop when trying to draw transmit current, since the corrosion "acts" like a resistor.? They were all easy fixes.? You might check those before spending time and money getting the radio worked on.? Simple things first. Good luck Cliff/W6OEM
Tom Sneden All Messages By This Member #52329 Do a master reset! Here's how: To perform the master reset: Hold the [HOME] button (Button #4) while turning on the rig with the POWER button (Button #10). The radio will be reset to factory default settings. toggle quoted message Show quoted text On Fri, Feb 4, 2022 at 1:25 AM Pasquale Stella <hb9irb@...> wrote: Unfortunately, no carrier starts: When I press the PTT the red TX / BUSY light turns on and the fan starts, and I repeat it does not absorb any current from the power supply. Tested in all TX modes: SSB, CW, AM, FM, DIG etc. 73 Pasky HB9IRB Il 02.02.22 19:36, Steve Rosman ha scritto: Apologies in advance if this was already checked.? Does the radio show red light for transmit,? and what mode are you using? Only CW, PKT, or FM will transmit a carrier without modulating like speaking into the mike.? I have forgotten to check this more than once and saw no power output. Hope this helps.? 73 Steve KA2YRA? On Wed, Feb 2, 2022, 1:25 PM Pasquale Stella <hb9irb@...> wrote: it would be too beautiful and simple if you could solve it as you suggested ....... a bit of optimism comes from the fact that the radio has 2 HF + V-UHF power amps and it seems impossible to me that both are burned at the same time. it is much more likely that the pre drive driving both power amplifiers has burned out. So I appeal to all owners of this radio who know of this rare problem. HB9IRB
J.D. Barron All Messages By This Member #52330 If the full factory reset does not get you going I believe you will have to actuallyt open the radio up and troubleshoot.? The TX indication shows me that you are getting into the transmit mode and you will probably have to actually get a scope and trace the signal through the transmit chain. I think you are in the zone where one measurement will tell you a great deal about what is going on.? There are a few places where a single failure will take the transmitter down. I think that testing in FM will bypass part of the circuits and SSB the FM part.? I assume the radio receives all modes and bands OK. There are a couple of points where all modes of transmit pass through and it could be as simple as a bad switching diode or amp. I believe that you have exhausted most of the external causes for lack of transmitting.
Pasky All Messages By This Member #52331 is the first thing I did ..... thanks anyway. toggle quoted message Show quoted text Il giorno ven 4 feb 2022 alle ore 17:13 Tom Sneden <tsneden@...> ha scritto: Do a master reset! Here's how: To perform the master reset: Hold the [HOME] button (Button #4) while turning on the rig with the POWER button (Button #10). The radio will be reset to factory default settings. On Fri, Feb 4, 2022 at 1:25 AM Pasquale Stella <hb9irb@...> wrote: Unfortunately, no carrier starts: When I press the PTT the red TX / BUSY light turns on and the fan starts, and I repeat it does not absorb any current from the power supply. Tested in all TX modes: SSB, CW, AM, FM, DIG etc. 73 Pasky HB9IRB Il 02.02.22 19:36, Steve Rosman ha scritto: Apologies in advance if this was already checked.? Does the radio show red light for transmit,? and what mode are you using? Only CW, PKT, or FM will transmit a carrier without modulating like speaking into the mike.? I have forgotten to check this more than once and saw no power output. Hope this helps.? 73 Steve KA2YRA? On Wed, Feb 2, 2022, 1:25 PM Pasquale Stella <hb9irb@...> wrote: it would be too beautiful and simple if you could solve it as you suggested ....... a bit of optimism comes from the fact that the radio has 2 HF + V-UHF power amps and it seems impossible to me that both are burned at the same time. it is much more likely that the pre drive driving both power amplifiers has burned out. So I appeal to all owners of this radio who know of this rare problem. HB9IRB
Pasky All Messages By This Member #52332 Right, it's the same path I want to take. ? The forum has reached its limit. toggle quoted message Show quoted text Il giorno ven 4 feb 2022 alle ore 17:21 J.D. Barron <jeter.d.barron@...> ha scritto: If the full factory reset does not get you going I believe you will have to actuallyt open the radio up and troubleshoot.? The TX indication shows me that you are getting into the transmit mode and you will probably have to actually get a scope and trace the signal through the transmit chain. I think you are in the zone where one measurement will tell you a great deal about what is going on.? There are a few places where a single failure will take the transmitter down. I think that testing in FM will bypass part of the circuits and SSB the FM part.? I assume the radio receives all modes and bands OK. There are a couple of points where all modes of transmit pass through and it could be as simple as a bad switching diode or amp. I believe that you have exhausted most of the external causes for lack of transmitting.

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