Re: SR2000 Cant Null carrier
OK C, ?I guess I am beating a dead horse, but: I am one of those guys that just gotta know exactly why something fails, along with the failure mechanism[s]. In some of my working days you couldn’t just throw out a 2000Amp bus-bars because current didn’t go from one end to the other; you had to find the problem [the real problem]! You triggered my 1950’s curiosity. I thought I knew what a trimmer is/was, but I never built one, so I guess I have been missing something. I have not been able to find details of trimmer construction; only simplified sketches. So we can only presume that ?if one plate of the capacitance part of the unit is one ?metal piece and it has fractured [maybe due to adjustment]? or [ more likely] if one plate of the capacitance part of the unit ?is SOMEHOW connected to the terminal ??metal ?using a simple compression means and that compression has weakened [maybe due to normal thermal cycling] or, as likely you are saying, corrosion wiggled it way right between the pressure/ contact points, which is all aided by the local climate conditions, and that corrosion is non-conductive [consistent with aluminum oxides] Re: “I opened it up and it appears to be corroded.”? ???Is that a one way operation, or can it be reversed? visible corrosion should not hurt, but if there is a joint …..? ? Maxwell did not allow for bad joints in his formulas.
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From: [email protected] [mailto:[email protected]] On Behalf Of W7WRX
Sent: Wednesday, April 3, 2024 12:08 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] SR2000 Cant Null carrier? Don. The cap was open.? I understand these are known to just up and fail.? Its listed-on Walt's document.? ?I am unsure why they fail. Just age?? Maybe corrosion?? I opened it up and it appears to be corroded.?
C ? -- don??? va3drl
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Ok. Nice.? ?Sounds like you're making progress!? Both mine are on back burner now.? I have to wait for parts to resume work.? I get the new load cap first.? W0VMC made me one.? He took a slightly larger cap with the same mounting holes and machined the shaft
for me.? It was 3/8ths.? I measured everything so it should just drop in and be a slight upgrade.?
Would love to schedule a QSO when we get these things finished!
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The chirp is only for a nano second... it is not a oscillation?as you described. It's a blip chirp, haha.
I was able to adjust the PIN 3 bias? voltage down to factory specs by increasing the resistance of R328. I raised the
resistance from 47K to 120K and every bias voltage, the -91, -20, -30 and the plate idle from Hi PWR and LO PWR are all right on the money now.
I'll have to think more about the blip chirp. Perhaps the RF choke to ground needs to be replaced or value changed. The 1Mh might not be doing the job.
73
dave
73
dave
On Wed, Apr 3, 2024 at 3:20?PM W7WRX < clark@...> wrote:
On My rig if you turned the load knob it would vary the chirp.? It was worse when the plates made contact.? ?
Did you try to loosen the mounting screws while listing to the chirp?
Yes. The plates are super close. I think this is a major design flaw of this rig.? Those load caps should never have been used in a 1kw rig.?
Thanks,
I sprayed a piece of construction paper w/Deoxit and cleaned all 3 sections of fins... Prior to cleaning I could not find any visible shorts.? With the radio powered off I measured the resistance across the plates and found no shorts, just a constant 52
ohms.? After the cleaning and shaft bearing lube the chirp duration and amplitude dropped significantly. ALmost undetectable, buried in the noise of the TR relay. The -91vdc bias is on those plates all the time, even in receive?mode. The stator?sections appear
to be press fitted or else I would attempt to shift them slightly. The spacing seems ridiculously?close. I don't have a shield on the 12BY7 and wonder if this in some way contributes to this instability issue.
Lastly, I've never been able to achieve the -20 / -30vdc bias indicated in the schematic of the PS-2000. It is more like -54 / -77vdc. Has anyone found similar readings?? The -91 vdc bias is rock solid in both low and high power. As is the .2A plate idle
current.?
73
dave
wa3gin
On Wed, Apr 3, 2024 at 12:55?PM W7WRX < clark@...> wrote:
yes. The plates are shorting.? ?This radio was shorting on the back section. About 2 to 3 plates in.? I could set it so the rig was oscillating, then, using a plastic tool, spread the plates and noise would stop when I found it.
Also, I highly recommend you loosen the mounting screws while its in that spot.? It could be shimmed and fixed that way if the cap is not damaged.
C
Thanks for the info.? I read the AXN info, looked at the cap but didn't see anything.? I guess I will take a harder look.??
73
dave
On Tue, Apr 2, 2024 at 7:48?PM W7WRX < clark@...> wrote:
This is going to be a shorting load cap.? I just had this happen on one of my rigs. It would oscillate just exactly like you describe.
The Cap is a real sore spot of this rig.? They arc like crazy when people tune the rig at full power or with an antenna load that has some SWR.
This was documented in the papers on k9AXN website.
The document describes this problem and suggests manipulation of the three mounting screws.? Adjusting these has a huge impact on plate contact.?
What I suggest is to remove the cap and then clean and examine the plates.
Remove the three screws on side of chassis.? Use a flat screwdriver to slide the plastic coupler towards panel and off the cap shaft.??
Lean cap forward and you can get to the three solder tabs to unsolder the solid wire leads.
Once cap is out, you can get mag glass on and inspect the last section towards the rear.? I slid paper soaked in deoxit between plates and gently spun shaft to find where the plates where making contact.
If your LUCKY you can fix it.? If you can hipot test it, run it up to 600volts to make sure its fixed.
The one radio, I was able to repair it and gently bed the last few plates and eliminate?the contact and NOT even remove it.?
On the second radio the cap was just to far gone. The ball bearings had fallen out and heavy contact was made damaging the plates.
I have two spare load caps but they are NOT identical.? I have a third on the way now and think this time I got the right part.
Your welcome to the old one if you decide you can repair it. Maybe parts from it will help you.
Report back!
C
Chirp Chirp Chirp, geez.?
Hi Folks,
In the process of restoring a SR2K. In receive when I rotate the load control an oscillation / Chrip is heard on the speaker. This condition occur with or without HV.?
Thoughts Welcome,
dave
wa3gin
|
On Wed, Apr 3, 2024 at 03:42 AM, Bill (Group Owner) wrote:
Interesting, if a band opening, I'd like to try to work you with my very excellent Lafayette HA-460, 6 meter AM rig.
K2WH
The band opening should start MAY/JUNE 50.400 MHz It should work? with my SR-34 + Teletec DXP-180 amp and Cushcraft 5-element beam! -- 73/Rick W4XA __________________________________ All posts are created using OpenSuSE Leap 15.5 x64 Linux
|
The chirp is only for a nano second... it is not a oscillation?as you described. It's a blip chirp, haha.
I was able to adjust the PIN 3 bias? voltage down to factory specs by increasing the resistance of R328. I raised the resistance from 47K to 120K and every bias voltage, the -91, -20, -30 and the plate idle from Hi PWR and LO PWR are all right on the money now.
I'll have to think more about the blip chirp. Perhaps the RF choke to ground needs to be replaced or value changed. The 1Mh might not be doing the job.
73 dave
73 dave
On Wed, Apr 3, 2024 at 3:20?PM W7WRX < clark@...> wrote:
On My rig if you turned the load knob it would vary the chirp.? It was worse when the plates made contact.? ?
Did you try to loosen the mounting screws while listing to the chirp?
Yes. The plates are super close. I think this is a major design flaw of this rig.? Those load caps should never have been used in a 1kw rig.?
Thanks,
I sprayed a piece of construction paper w/Deoxit and cleaned all 3 sections of fins... Prior to cleaning I could not find any visible shorts.? With the radio powered off I measured the resistance across the plates and found no shorts, just a constant 52
ohms.? After the cleaning and shaft bearing lube the chirp duration and amplitude dropped significantly. ALmost undetectable, buried in the noise of the TR relay. The -91vdc bias is on those plates all the time, even in receive?mode. The stator?sections appear
to be press fitted or else I would attempt to shift them slightly. The spacing seems ridiculously?close. I don't have a shield on the 12BY7 and wonder if this in some way contributes to this instability issue.
Lastly, I've never been able to achieve the -20 / -30vdc bias indicated in the schematic of the PS-2000. It is more like -54 / -77vdc. Has anyone found similar readings?? The -91 vdc bias is rock solid in both low and high power. As is the .2A plate idle
current.?
73
dave
wa3gin
On Wed, Apr 3, 2024 at 12:55?PM W7WRX < clark@...> wrote:
yes. The plates are shorting.? ?This radio was shorting on the back section. About 2 to 3 plates in.? I could set it so the rig was oscillating, then, using a plastic tool, spread the plates and noise would stop when I found it.
Also, I highly recommend you loosen the mounting screws while its in that spot.? It could be shimmed and fixed that way if the cap is not damaged.
C
Thanks for the info.? I read the AXN info, looked at the cap but didn't see anything.? I guess I will take a harder look.??
73
dave
On Tue, Apr 2, 2024 at 7:48?PM W7WRX < clark@...> wrote:
This is going to be a shorting load cap.? I just had this happen on one of my rigs. It would oscillate just exactly like you describe.
The Cap is a real sore spot of this rig.? They arc like crazy when people tune the rig at full power or with an antenna load that has some SWR.
This was documented in the papers on k9AXN website.
The document describes this problem and suggests manipulation of the three mounting screws.? Adjusting these has a huge impact on plate contact.?
What I suggest is to remove the cap and then clean and examine the plates.
Remove the three screws on side of chassis.? Use a flat screwdriver to slide the plastic coupler towards panel and off the cap shaft.??
Lean cap forward and you can get to the three solder tabs to unsolder the solid wire leads.
Once cap is out, you can get mag glass on and inspect the last section towards the rear.? I slid paper soaked in deoxit between plates and gently spun shaft to find where the plates where making contact.
If your LUCKY you can fix it.? If you can hipot test it, run it up to 600volts to make sure its fixed.
The one radio, I was able to repair it and gently bed the last few plates and eliminate?the contact and NOT even remove it.?
On the second radio the cap was just to far gone. The ball bearings had fallen out and heavy contact was made damaging the plates.
I have two spare load caps but they are NOT identical.? I have a third on the way now and think this time I got the right part.
Your welcome to the old one if you decide you can repair it. Maybe parts from it will help you.
Report back!
C
Chirp Chirp Chirp, geez.?
Hi Folks,
In the process of restoring a SR2K. In receive when I rotate the load control an oscillation / Chrip is heard on the speaker. This condition occur with or without HV.?
Thoughts Welcome,
dave
wa3gin
|
On My rig if you turned the load knob it would vary the chirp.? It was worse when the plates made contact.? ?
Did you try to loosen the mounting screws while listing to the chirp?
Yes. The plates are super close. I think this is a major design flaw of this rig.? Those load caps should never have been used in a 1kw rig.?
toggle quoted message
Show quoted text
Thanks,
I sprayed a piece of construction paper w/Deoxit and cleaned all 3 sections of fins... Prior to cleaning I could not find any visible shorts.? With the radio powered off I measured the resistance across the plates and found no shorts, just a constant 52
ohms.? After the cleaning and shaft bearing lube the chirp duration and amplitude dropped significantly. ALmost undetectable, buried in the noise of the TR relay. The -91vdc bias is on those plates all the time, even in receive?mode. The stator?sections appear
to be press fitted or else I would attempt to shift them slightly. The spacing seems ridiculously?close. I don't have a shield on the 12BY7 and wonder if this in some way contributes to this instability issue.
Lastly, I've never been able to achieve the -20 / -30vdc bias indicated in the schematic of the PS-2000. It is more like -54 / -77vdc. Has anyone found similar readings?? The -91 vdc bias is rock solid in both low and high power. As is the .2A plate idle
current.?
73
dave
wa3gin
On Wed, Apr 3, 2024 at 12:55?PM W7WRX < clark@...> wrote:
yes. The plates are shorting.? ?This radio was shorting on the back section. About 2 to 3 plates in.? I could set it so the rig was oscillating, then, using a plastic tool, spread the plates and noise would stop when I found it.
Also, I highly recommend you loosen the mounting screws while its in that spot.? It could be shimmed and fixed that way if the cap is not damaged.
C
Thanks for the info.? I read the AXN info, looked at the cap but didn't see anything.? I guess I will take a harder look.??
73
dave
On Tue, Apr 2, 2024 at 7:48?PM W7WRX < clark@...> wrote:
This is going to be a shorting load cap.? I just had this happen on one of my rigs. It would oscillate just exactly like you describe.
The Cap is a real sore spot of this rig.? They arc like crazy when people tune the rig at full power or with an antenna load that has some SWR.
This was documented in the papers on k9AXN website.
The document describes this problem and suggests manipulation of the three mounting screws.? Adjusting these has a huge impact on plate contact.?
What I suggest is to remove the cap and then clean and examine the plates.
Remove the three screws on side of chassis.? Use a flat screwdriver to slide the plastic coupler towards panel and off the cap shaft.??
Lean cap forward and you can get to the three solder tabs to unsolder the solid wire leads.
Once cap is out, you can get mag glass on and inspect the last section towards the rear.? I slid paper soaked in deoxit between plates and gently spun shaft to find where the plates where making contact.
If your LUCKY you can fix it.? If you can hipot test it, run it up to 600volts to make sure its fixed.
The one radio, I was able to repair it and gently bed the last few plates and eliminate?the contact and NOT even remove it.?
On the second radio the cap was just to far gone. The ball bearings had fallen out and heavy contact was made damaging the plates.
I have two spare load caps but they are NOT identical.? I have a third on the way now and think this time I got the right part.
Your welcome to the old one if you decide you can repair it. Maybe parts from it will help you.
Report back!
C
Chirp Chirp Chirp, geez.?
Hi Folks,
In the process of restoring a SR2K. In receive when I rotate the load control an oscillation / Chrip is heard on the speaker. This condition occur with or without HV.?
Thoughts Welcome,
dave
wa3gin
|
Thanks,
I sprayed a piece of construction paper w/Deoxit and cleaned all 3 sections of fins... Prior to cleaning I could not find any visible shorts.? With the radio powered off I measured the resistance across the plates and found no shorts, just a constant 52 ohms.? After the cleaning and shaft bearing lube the chirp duration and amplitude dropped significantly. ALmost undetectable, buried in the noise of the TR relay. The -91vdc bias is on those plates all the time, even in receive?mode. The stator?sections appear to be press fitted or else I would attempt to shift them slightly. The spacing seems ridiculously?close. I don't have a shield on the 12BY7 and wonder if this in some way contributes to this instability issue.
Lastly, I've never been able to achieve the -20 / -30vdc bias indicated in the schematic of the PS-2000. It is more like -54 / -77vdc. Has anyone found similar readings?? The -91 vdc bias is rock solid in both low and high power. As is the .2A plate idle current.?
73 dave wa3gin
On Wed, Apr 3, 2024 at 12:55?PM W7WRX < clark@...> wrote:
yes. The plates are shorting.? ?This radio was shorting on the back section. About 2 to 3 plates in.? I could set it so the rig was oscillating, then, using a plastic tool, spread the plates and noise would stop when I found it.
Also, I highly recommend you loosen the mounting screws while its in that spot.? It could be shimmed and fixed that way if the cap is not damaged.
C
Thanks for the info.? I read the AXN info, looked at the cap but didn't see anything.? I guess I will take a harder look.??
73
dave
On Tue, Apr 2, 2024 at 7:48?PM W7WRX < clark@...> wrote:
This is going to be a shorting load cap.? I just had this happen on one of my rigs. It would oscillate just exactly like you describe.
The Cap is a real sore spot of this rig.? They arc like crazy when people tune the rig at full power or with an antenna load that has some SWR.
This was documented in the papers on k9AXN website.
The document describes this problem and suggests manipulation of the three mounting screws.? Adjusting these has a huge impact on plate contact.?
What I suggest is to remove the cap and then clean and examine the plates.
Remove the three screws on side of chassis.? Use a flat screwdriver to slide the plastic coupler towards panel and off the cap shaft.??
Lean cap forward and you can get to the three solder tabs to unsolder the solid wire leads.
Once cap is out, you can get mag glass on and inspect the last section towards the rear.? I slid paper soaked in deoxit between plates and gently spun shaft to find where the plates where making contact.
If your LUCKY you can fix it.? If you can hipot test it, run it up to 600volts to make sure its fixed.
The one radio, I was able to repair it and gently bed the last few plates and eliminate?the contact and NOT even remove it.?
On the second radio the cap was just to far gone. The ball bearings had fallen out and heavy contact was made damaging the plates.
I have two spare load caps but they are NOT identical.? I have a third on the way now and think this time I got the right part.
Your welcome to the old one if you decide you can repair it. Maybe parts from it will help you.
Report back!
C
Chirp Chirp Chirp, geez.?
Hi Folks,
In the process of restoring a SR2K. In receive when I rotate the load control an oscillation / Chrip is heard on the speaker. This condition occur with or without HV.?
Thoughts Welcome,
dave
wa3gin
|
Re: Sx100 question on 50.5 kc alignment
I agree and bet that the issues are indeed related, but I would stick with the designed values on the parts list and schematic.
On Wednesday, April 3, 2024 at 09:12:14 AM PDT, Keith <kd4avp@...> wrote:
They are originals. I checked the band colors and one is a 1meg and the other 820k.
Neither tested anywhere close to these values.?
Thankfully I do have something in which to replace them.
According to the schematic used for test points, it refers to both as 1meg values.
Apparently this is an acceptable value for this location.
Its not giving me good DC voltages at this point, so do think it would hurt to go ahead and replace them.
This is a radio that popped the R39 39k resistor at some point in its life.
Possibly could be related.
|
yes. The plates are shorting.? ?This radio was shorting on the back section. About 2 to 3 plates in.? I could set it so the rig was oscillating, then, using a plastic tool, spread the plates and noise would stop when I found it.
Also, I highly recommend you loosen the mounting screws while its in that spot.? It could be shimmed and fixed that way if the cap is not damaged.
C
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Thanks for the info.? I read the AXN info, looked at the cap but didn't see anything.? I guess I will take a harder look.??
73
dave
On Tue, Apr 2, 2024 at 7:48?PM W7WRX < clark@...> wrote:
This is going to be a shorting load cap.? I just had this happen on one of my rigs. It would oscillate just exactly like you describe.
The Cap is a real sore spot of this rig.? They arc like crazy when people tune the rig at full power or with an antenna load that has some SWR.
This was documented in the papers on k9AXN website.
The document describes this problem and suggests manipulation of the three mounting screws.? Adjusting these has a huge impact on plate contact.?
What I suggest is to remove the cap and then clean and examine the plates.
Remove the three screws on side of chassis.? Use a flat screwdriver to slide the plastic coupler towards panel and off the cap shaft.??
Lean cap forward and you can get to the three solder tabs to unsolder the solid wire leads.
Once cap is out, you can get mag glass on and inspect the last section towards the rear.? I slid paper soaked in deoxit between plates and gently spun shaft to find where the plates where making contact.
If your LUCKY you can fix it.? If you can hipot test it, run it up to 600volts to make sure its fixed.
The one radio, I was able to repair it and gently bed the last few plates and eliminate?the contact and NOT even remove it.?
On the second radio the cap was just to far gone. The ball bearings had fallen out and heavy contact was made damaging the plates.
I have two spare load caps but they are NOT identical.? I have a third on the way now and think this time I got the right part.
Your welcome to the old one if you decide you can repair it. Maybe parts from it will help you.
Report back!
C
Chirp Chirp Chirp, geez.?
Hi Folks,
In the process of restoring a SR2K. In receive when I rotate the load control an oscillation / Chrip is heard on the speaker. This condition occur with or without HV.?
Thoughts Welcome,
dave
wa3gin
|
See attachment for details - Iowa Antique Radio Club and Historical Society's annual Antique Radio / Vintage Electronics Auction, May 4, 2024
|
Re: SR2000 Cant Null carrier
Just an observation from my experience with Collins S/Line gear.? It seems that over time, the ceramic trimmers seize and fail to turn without exerting a high twisting force.? With enough twisting pressure, the rotor quickly snaps free.? Possibly that breaking action causes the cap failure?? If the cap seems free to turn now, possibly it seized, broke free, and failed under prior ownership.? ?? ? Paul, W9AC ?
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From: [email protected] <[email protected]> On Behalf Of W7WRX
Sent: Wednesday, April 3, 2024 12:08 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] SR2000 Cant Null carrier? Don. The cap was open.? I understand these are known to just up and fail.? Its listed-on Walt's document.? ?I am unsure why they fail. Just age?? Maybe corrosion?? I opened it up and it appears to be corroded.?
C
|
Re: SR2000 Cant Null carrier
There are two main causes for the ceramic variables failures. Long time storage in humid conditions and improper chassis cleaning methods.
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Don. The cap was open.? I understand these are known to just up and fail.? Its listed-on Walt's document.? ?I am unsure why they fail. Just age?? Maybe corrosion?? I opened it up and it appears to be corroded.?
C
|
Re: Sx100 question on 50.5 kc alignment
They are originals. I checked the band colors and one is a 1meg and the other 820k.
Neither tested anywhere close to these values.?
Thankfully I do have something in which to replace them.
According to the schematic used for test points, it refers to both as 1meg values.
Apparently this is an acceptable value for this location.
Its not giving me good DC voltages at this point, so do think it would hurt to go ahead and replace them.
This is a radio that popped the R39 39k resistor at some point in its life.
Possibly could be related.
|
Re: SR2000 Cant Null carrier
Don. The cap was open.? I understand these are known to just up and fail.? Its listed-on Walt's document.? ?I am unsure why they fail. Just age?? Maybe corrosion?? I opened it up and it appears to be corroded.?
C
|
I guess I'm going to have to cut me a 6 M inverted Vee.? I think I'll make a 10/6M arrangement...
73,
--
Justin B.
KI5GKD
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Re: Sx100 question on 50.5 kc alignment
Did the Color Code of R48 & R49 reflect the measured value or were they original resistors? ?? I found that nearly all the resistors values I checked, in my SX-100 were at least +20% high. I was told that when these old radios were stored for long periods of time, the carbon resistors actually suck moisture out of the air, increasing their resistance. I was advised NOT to replace them, but to instead "bake out" the moisture by leaving the radio on, and lightly covered, for 3 or 4 days. It actually worked on most of them. Now, anytime I'm in the garage (my shack),?especially in the winter I turn the radio on. I've also placed my Yaesu-710 on top of it to reap the benefits of? all that waisted heat.? -Drew
On Tuesday, April 2, 2024 at 06:00:13 PM PDT, Keith <kd4avp@...> wrote:
Got the signal generator down to 1 volt on the 50.5 kc signal.?
Still no luck on the correct voltage at test point B.
This really had me scratching my head at this point.
Then decided to check the values of R48 (1 meg) & R49 (820k).
They test way out of tolerance. Both around 500k.
Looking at the drawing showing the test points, it is showing both resistors at a 1 meg value.
Will replace those two later this week. I have some 1/2 watt 1 meg resistors.?
Think I will just go 1 meg on both.?
Could this also be part of my issue?
Definitely cant be helping.??
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Hi Tom – ? I sold an HT-9 to W3GMS about 40 years ago. He has had it on the air and I think he still uses it from time to time. Try contacting him. 73 & GL – Mike ? Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 ?
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From: [email protected] < [email protected]> On Behalf Of Tom Smith Sent: Wednesday, April 3, 2024 8:32 AM To: [email protected]Subject: [HallicraftersRadios] Hallicrafters HT-9 ? I have the opportunity to acquire a cosmetically nice and apparently unmodified HT-9. I have two issues with this purchase. First issue, because of its weight it will require a 9 hour drive one way (18 hours total and an overnight motel stay). The second major issue is it has no coils or tuning units. This is a bigger issue since I’ve been unable to find anything available or even fabrication info to make my own. I would need at least 80m stuff.
I think it would be great to put this transmitter back on the air but will require some really difficult to find stuff, otherwise it will be a heavy boat anchor unable to do anything but sit there and look pretty. ? ?:<}
Tom N5AMA
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Re: SR2000 Cant Null carrier
Hi Jim
What is copper butter and can you recommend any dealer who sells it?
Thanks
sam - WS4AM
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I have the opportunity to acquire a cosmetically nice and apparently unmodified HT-9. I have two issues with this purchase. First issue, because of its weight it will require a 9 hour drive one way (18 hours total and an overnight motel stay). The second major issue is it has no coils or tuning units. This is a bigger issue since I’ve been unable to find anything available or even fabrication info to make my own. I would need at least 80m stuff.
I think it would be great to put this transmitter back on the air but will require some really difficult to find stuff, otherwise it will be a heavy boat anchor unable to do anything but sit there and look pretty. ? ?:<}
Tom N5AMA
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don Root
Rick W7IMM
Dave Jordan
KN6WFM (Drew)
Paul Christensen
waltcates