Re: TL-922A transmits when switched from standby to operate.
I wasn¡¯t going to bake any names
The original owner blew finals in one radio, second owner blew finals in two radios.
I suspect the original t/r relay board to have been the culprit that caused the radio / radios issue.
Didn¡¯t help the tube having the filament tapped to 220 as most have closer to 250
Correct that line filter did not cause the radio issue, but had poor solder work and is absolutely not needed. I found various poor solder joints , maybe the first owner tried to fix it.
All good now
Not sure I want to get involved with this model or the two others that use the same cabinet. Real pain to put together then break back down for shipping.
I¡¯m just glad I didn¡¯t blow the finals in my test radio, that would have been a first.
I¡¯ve put that ft-950 through hell and it keeps chugging along
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On 2024-10-19 05:01, Louis Parascondola via groups.io wrote: John, that was an amplifier that belonged to me. I was sent an
AL1200by a person up north of here to look at, he claim the amp was
was problematic. I told him how to pack the tube for safe trip about
300 miles. I got the AL1200 safely. I put the tube in the amp and
the tube was totally dead! Wouldn¡¯t do anything. I called the guy
and told him the tube is totally dead and I couldn¡¯t get a lick of
power out of it. He said it was working. Anyhow I said you need a
new tube. Trying to get a new one was out of the question. Finding a
good used one is sketchy and I wouldn¡¯t stick my neck out. Bad
situation at this point. Told him I would take the 1200 and give him
this AL1500 of mine which was working just fine. Did a swap on the RF
deck and he just paid less money than he¡¯d pay for a 3cx1200a7.
Shipped him the AL1500. He got it and in a while mentioned issues
much like he had with the AL1200. I told him with two amps acting
strangely it sounded like antenna or feedline issues. Sounded like
high common mode to me. Told him two amps not working properly is
suspect of load or something. Again amp working fine at time of swap.
Ends up he sells amp to a guy. That guy blows up radios. Amp guy
gets it and finds it¡¯s got a bad tube. Probably arcing plate to
cathode sending power back to radio. So who knows what happened in
the interim? Amp eventually got another tube. A bad tube problem the
cause of guy #2 problem, probably blown like the original 3cx1200 in
the amp of guy #1. Other issues like a line filter were already
installed when I got that amp. A harmless line filter doesn¡¯t blow
radios but was removed. Step start relays always have a black spot
over time but still work, doesn¡¯t blow radios. The so called train
wreck amp worked for me no problem. It seems to me the that amp fell
victim to the same fate as the AL1200 with a bad tube.
Sent from the all new AOL app for iOS [1]
On Saturday, October 19, 2024, 5:22 AM, John Sparkes
<vk6jx1@...> wrote:
Don¡¯t be bashful - tell us all who ?
On 19 Oct 2024, at 10:30?AM, Amp Guy Llc via groups.io <kb1sel@...> wrote:
?Take a guess on who did the prior work to the al1500 I repaired in my last video on YouTube.
On 2024-10-18 19:47, Jim McPhee via groups.io wrote:
Could you elaborate on what "installing the proper way" is?
Without
those details, this statement is not very useful.
--
Jim McPhee
Placitas, NM
W5ABA
Links:
------
[1] /g/ham-amplifiers/message/40580
[2] /mt/109086005/8135091
[3] /g/ham-amplifiers/post
[4] /g/ham-amplifiers/editsub/8135091
[5]
/g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
Links:
------
[1]
[2] /g/ham-amplifiers/message/40585
[3] /mt/109086005/8135091
[4] /g/ham-amplifiers/post
[5] /g/ham-amplifiers/editsub/8135091
[6] /g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
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Re: TL-922A transmits when switched from standby to operate.
John, that was an amplifier that belonged to me. ?I was sent an AL1200by a person up north of here to look at, he claim the amp was was problematic. ?I told him how to pack the tube for safe trip about??300 miles. ?I got the AL1200 safely. ?I put the tube in the amp and the tube was totally dead! ?Wouldn¡¯t do anything. ?I called the guy and told him the tube?is totally dead and I couldn¡¯t get a lick of power out of it. ?He said it was working. ?Anyhow I said you need a new tube. ?Trying to get a new one was out of the question. ?Finding a good used one is sketchy and I wouldn¡¯t stick my neck out. ?Bad?situation??at this point. ?Told him I would take the 1200 and give him this AL1500 of mine which was working just fine. ?Did a swap on the RF deck and he just paid less money than he¡¯d pay for a 3cx1200a7. ?Shipped him the AL1500. ?He got it and in a while mentioned issues much like he had with the AL1200. ?I told him with two amps acting strangely it sounded like antenna or feedline issues. ?Sounded like high common mode to me. ?Told him two amps not working properly is suspect of load or something. ?Again amp working fine at time of swap. ?Ends up he sells amp to a guy. ?That guy blows up radios. ?Amp guy gets it and finds it¡¯s got a bad tube. ?Probably arcing plate to cathode sending power back to radio. ?So who knows what happened in the interim? ?Amp eventually got another tube. A bad tube problem the cause of guy #2 problem, probably blown like the original 3cx1200?in the amp of guy #1. ?Other issues like a line filter were already installed when I got that amp. ?A harmless line filter doesn¡¯t blow radios but was removed. ?Step start relays always have a black spot over time ?but still work, doesn¡¯t blow radios. ?The so called train wreck amp ?worked for me no problem. ?It seems to me the that amp fell victim to the same fate as the AL1200 with a bad tube. ??
On Saturday, October 19, 2024, 5:22 AM, John Sparkes <vk6jx1@...> wrote:
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Re: TL-922A transmits when switched from standby to operate.
Take a guess on who did the prior work to the al1500 I repaired in my last video on YouTube.
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Re: TL-922A transmits when switched from standby to operate.
Some people lengthen the key line wire so they can add a standby operate switch, they also may be staring with a inferior kit or have other existing problems in the pa to start with
If I lengthen the key line wire for a standby operate switch ,I add rf bypassing and ferrite beads.
Every pa I have installed one in was completely gone through prior to installing a soft key kit.
Again have yet to ever have an issue
Must beware of info online, there are a lot of people who want to make a buck or a name for themselves . I get pa¡¯s in all the time with nonsense mods that cause more grief than good.
For your 922 I suggest you follow the 922 mods listed on w8ji¡¯s site. Those are all I implement when I repair one. Once done will be one and done.
Great amp, my favorite out of any ham commercially made amp.
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Re: TL-922A transmits when switched from standby to operate.
Lou,
?
If it is all right with you, I will email you directly about this behavior. With the CQ World Wide DX Contest coming up next weekend, I'm thinking I would like to order a replacement soft key module right now, so I have it in hand to replace the existing one if it turns out the existing one is suspect.
--
Jim McPhee
Placitas, NM
W5ABA
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Re: TL-922A transmits when switched from standby to operate.
Could you elaborate on what "installing the proper way" is? Without those details, this statement is not very useful.
--
Jim McPhee
Placitas, NM
W5ABA
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Re: TL-922A transmits when switched from standby to operate.
I have installed literally hundreds of soft key kits, I have yet to have an issue in any band 160-10. But I¡¯m installing the proper way.
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On 2024-10-18 19:25, Louis Parascondola via groups.io wrote: Yes I remember and you did a great job documenting all that!!! Great
job. Yup it¡¯s crazy that things happen when just moving stuff
around. But stranger things happen. If it¡¯s the soft key I¡¯ll
just send you another one.
Sent from the all new AOL app for iOS [1]
On Friday, October 18, 2024, 7:37 PM, Jim McPhee via groups.io
<jmcphee@...> wrote:
Thanks Lou. I'll get the schematic out and investigate that circuit.
I know it is not likely to have anything to do with it having been
disconnected and moved for a couple of days but I can't help but
wonder!
I do have a softkey module installed. I got it from you, early
September last year. At that same time I grounded the grid pins
directly, and did the bias mod that you recommended. It has been
been working better than ever since then.
--
Jim McPhee
Placitas, NM
W5ABA
Links:
------
[1]
[2] /g/ham-amplifiers/message/40578
[3] /mt/109086005/8135091
[4] /g/ham-amplifiers/post
[5] /g/ham-amplifiers/editsub/8135091
[6] /g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
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Re: TL-922A transmits when switched from standby to operate.
Yes I remember and you did a great job documenting all that!!! ?Great job. ?Yup it¡¯s crazy that things happen when just moving stuff around. ?But stranger things happen. ?If it¡¯s the soft key I¡¯ll just send you another one.?
On Friday, October 18, 2024, 7:37 PM, Jim McPhee via groups.io <jmcphee@...> wrote: Thanks Lou. I'll get the schematic out and investigate that circuit. I know it is not likely to have anything to do with it having been disconnected and moved for a couple of days but I can't help but wonder!
?
I do have a softkey module installed. I got it from you, early September last year. At that same time I grounded the grid pins directly, and did the bias mod that you recommended. It has been been working better than ever since then.
--
Jim McPhee
Placitas, NM
W5ABA
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Re: TL-922A transmits when switched from standby to operate.
Thanks Lou. I'll get the schematic out and investigate that circuit. I know it is not likely to have anything to do with it having been disconnected and moved for a couple of days but I can't help but wonder!
?
I do have a softkey module installed. I got it from you, early September last year. At that same time I grounded the grid pins directly, and did the bias mod that you recommended. It has been been working better than ever since then.
--
Jim McPhee
Placitas, NM
W5ABA
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Re: TL-922A transmits when switched from standby to operate.
Obviously the key line is shorted to ground if you pulled the key line out then the short is inward of the amp somewhere on the key line, could be a shorted mosfet in a softkey if you have one. ?It¡¯s a doorbell circuit, troubleshoot accordingly.
On Friday, October 18, 2024, 1:06 PM, Jim McPhee via groups.io <jmcphee@...> wrote: My TL-922A, which has been working flawlessly for quite some time, is now going into transmit mode as soon as the switch is changed from standby to operate. What has changed is I rearranged the shack, so had all equipment disconnected for two days. The amp stood on end over in the corner of the room for that period of time. Reconnected everything yesterday, and used the TS-890S barefoot for a contact with C21MM (Nauru). The amp was connected but not powered on. When I went to use the amp this morning, this behavior showed up.
?
I have disconnected the RELAY and ALC connections. No change.
Powered off and on several times, No change,
Disconnected the RF INPUT cable from the TS-890S. No change.
?
Any ideas about what might be causing this and how to fix it?
--
Jim McPhee
Placitas, NM
W5ABA
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TL-922A transmits when switched from standby to operate.
My TL-922A, which has been working flawlessly for quite some time, is now going into transmit mode as soon as the switch is changed from standby to operate. What has changed is I rearranged the shack, so had all equipment disconnected for two days. The amp stood on end over in the corner of the room for that period of time. Reconnected everything yesterday, and used the TS-890S barefoot for a contact with C21MM (Nauru). The amp was connected but not powered on. When I went to use the amp this morning, this behavior showed up.
?
I have disconnected the RELAY and ALC connections. No change.
Powered off and on several times, No change,
Disconnected the RF INPUT cable from the TS-890S. No change.
?
Any ideas about what might be causing this and how to fix it?
--
Jim McPhee
Placitas, NM
W5ABA
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RM Italy bla-350 plus reviews
Thinking about buying a bla-350 to use with my ten-tec Omni VI plus.
?
Has anyone used a 350? Is it a decent amp?
?
73's Mike?
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The amp uses a PI network.? ?Most ant tuners use a T network.?
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Joe, I can't answer like some of the guys here but I do know on the lower bands the plate is extremely broad and narrows as you go up in frequency. Bob W4JFA
?Been an AMP user for almost 50
years. But have a question.
The Plate/load/coil match the tube(s) output impedance to the
desired antenna impedance typically 50 ohms.
Just like a tuner changes a non 50 ohm antenna to 50 ohms.
But I just thought of this. in the antenna tuner the two caps can
be and usually are all over the place.
And their tuning is typically rather broad. the caps are not super
tight.
But in an AMP
The Plate control is very critical and narrow in optimum setting.
And It's level of "C" is almost predictable. You KNOW the 40 meter
will have less "C" than 80 meters.
And so on through the bands.
The load cap is almost in the same position and in almost every
amp I have had the optimum was rather broad.
Why?
Joe WB9SBD
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?Been an AMP user for almost 50
years. But have a question.
The Plate/load/coil match the tube(s) output impedance to the
desired antenna impedance typically 50 ohms.
Just like a tuner changes a non 50 ohm antenna to 50 ohms.
But I just thought of this. in the antenna tuner the two caps can
be and usually are all over the place.
And their tuning is typically rather broad. the caps are not super
tight.
But in an AMP
The Plate control is very critical and narrow in optimum setting.
And It's level of "C" is almost predictable. You KNOW the 40 meter
will have less "C" than 80 meters.
And so on through the bands.
The load cap is almost in the same position and in almost every
amp I have had the optimum was rather broad.
Why?
Joe WB9SBD
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When the amp hangs up on transmit, unplug the rca jack from the amp. If it then unkeys, the problem is not the amp. Test a couple times to confirm. Bob W4JFA
On Sat, Sep 21, 2024 at 11:55?AM Adrian Fewster via <vk4tux= [email protected]> wrote:
Use TX GND & GND? to key
73
vk4tux
On 22/9/24 00:35, Mike Sawyer via
wrote:
Ok
the fellow who gave me the SB-200 to repair now has it in
his possession again with no smoke! However, he said that
the antenna relay is hanging up just like the problem he
has on his AL-80. I know for a fact that it has the
Harbach ¡®soft-key¡¯ keying interface installed. The common
denominator is his FTDX-10. I am not familiar with that
rig at all. I understand it is possible to use 2 ports on
the back as a key line. Having said that, is there a
software setting that sets the key line or would keep it
high? He says he has to shut ¡®everything¡¯ down before it
returns to normal. I won¡¯t be able to visit his QTH and
examine it myself until sometime in Oct.
?????????
Is there something else I should also check out when I do
go? He is a smart ¡®cookie¡¯ but sometimes he can¡¯t see ¡°the
trees for the forest!¡±
?????????
Thanks in advance.
?
Mod-U-Lator,
Mike(y)/W3SLK
?
?
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Ok the fellow who gave me the SB-200 to repair now has it in his possession again with no smoke! However, he said that the antenna relay is hanging up just like the problem he has on his AL-80. I know for a fact that it has the Harbach ¡®soft-key¡¯ keying interface installed. The common denominator is his FTDX-10. I am not familiar with that rig at all. I understand it is possible to use 2 ports on the back as a key line. Having said that, is there a software setting that sets the key line or would keep it high? He says he has to shut ¡®everything¡¯ down before it returns to normal. I won¡¯t be able to visit his QTH and examine it myself until sometime in Oct. ????????? Is there something else I should also check out when I do go? He is a smart ¡®cookie¡¯ but sometimes he can¡¯t see ¡°the trees for the forest!¡± ????????? Thanks in advance. ? Mod-U-Lator, Mike(y)/W3SLK ? ?
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12 KW CCS ON 160-15M....USING THE 3CX-6000A7..... PART 20
12 KW CCS ON 160-15M....USING THE 3CX-6000A7..... PART 20
Misc info on how this project goes together.
Bottom of RF deck cabinet will hold the blower, fil xfmr, chain drives etc, etc.
The HV supply will reside in a separate cabinet, with the pair of 150 lb magnespec plate xfmrs, FWB assy, contactors, 20 x 2500uf lytics etc.
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I experimented making one with a 9v battery. Obviously with the pot adjusted too far one direction the voltage will go toward battery voltage (yes negative). Too high for the 706 or other Icoms. A coin battery would be a safety net for this but it may not last long due to current draw. A battery holder with two AA's?
Jim, there's a reason you made it with a 9v battery though.
Fun little projects.
Bob W4JFA?
Jim, I don't have a 706 but maybe someday. Anyway will the power out on the menu still effect the output power even though the 9 volt battery/potentiometer are on the ALC line?
I have an IC-746 with an RCA jack for the ALC in addition to the ALC on the DIN socket. If this will work for the 746 I'll make?it work with the RCA jack.
Thanks Jim?
Bob W4JFA?
Being curious, will this modification work with the 7300's too?
Andy
On 9/14/2024 1:49 PM, Bob via
wrote:
Jim, I now remember you writing about this a few
years ago. To me this is a serious design flaw. It shoulda went
back to the drawing board. Thanks for writing that again.
So, do you know if the Icom 746 has this spike?
Bob W4JFA?
The 706mk2 puts out a 150 watt spike, regardless of where
you set the PO.? ?The issue with ALC is..... it's closing
the barn door after the horse has bolted....too late to
catch a spike.? ?ALC sorta works ok on xcvrs with no
spike....and only works correctly? if the ALC? time constant
in the amp matches the ALC time constant in the
xcvr.....which never happens.?
One cure for the spike problem is to use a 9 vdc battery and
a 500k? pot.? 9 vdc applied to the extreme ends of the 500 k
pot.? ? Negative voltage comes off the wiper....and is fed
back to the xcvr's? ALC input.? (positive end of
pot / battery goes to the chassis of the xcvr).?
?
Set the pot? for whatever PO? on SSB? you desire.....and
it won't budge.? It can't.? The ALC voltage has now been
derived from the pot.....and is fixed....and is always
sitting there at the XCVR's ALC input.? ?Scream all you
want, and all you will get is say 20.5 watts pep out, that's
it....and no spikes.?
The 706MK2 with it's 150 watt spike will smoke every SS amp
made.? ?Buddy's? Icom? 775DSP was worse.? ?200 watt spike
regardless of where the PO was set at.? ?200 watt spike into
his tube amp was not good.? 200 watt spike every time he
tripped the VOX on ssb.? ?Same deal on the 706 xcvr, 150
watt spike every time you trip the vox on SSB.?
--
"Where the Old Soo crossed the New Soo"
Duplainville, Wisconsin
Broadcastify Train Scanner:
Youtube Channel:
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Bob