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Hello everyone,
Last summer I picked up a 2-C to go with my 2-NT.
I have been using it for CW without any troubles.
I tried to listen to some SSB signals tonight and I found a problem...
I cannot tune in the SSB signals, the mode control just spins around and has no effect.
This is the first time I have tried to listen to SSB so this is new to me.
Looking at the schematic before I open it up it looks like the mode switch should have a few positions to it and not just spin around.
Am I correct?
Thanks much,
Dave KC3AM
|
That knob should most certainly operate with a click at each position, allowing reception of AM, USB and LSB/CW.
There are two possibilities. One is simple, that the set screw for the knob is loose. I think this is a setscrew type knob¡
If the set screw is very tight but you still cannot get a switch action, remove the knob and have a look at the shaft. Try to turn it gently with a pliers. If you get the same result, remove the cover and have a look at the coupling between the small inner shaft and the switch behind it to see if it is loose or broken. That coupling is below the chassis (underside) towards the back, with the shaft going between the coils of the bandpass filter coils.
Try that. If no joy, I have the last possibility you. Don¡¯t want to hear unless you are really good at repair work.
Gary
W0DVN
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On Mar 20, 2023, at 8:28 PM, Dave via groups.io <kc3am@...> wrote:
Hello everyone,
Last summer I picked up a 2-C to go with my 2-NT.
I have been using it for CW without any troubles.
I tried to listen to some SSB signals tonight and I found a problem...
I cannot tune in the SSB signals, the mode control just spins around and has no effect.
This is the first time I have tried to listen to SSB so this is new to me.
Looking at the schematic before I open it up it looks like the mode switch should have a few positions to it and not just spin around.
Am I correct?
Thanks much,
Dave KC3AM
|
A normal selector switch.
Is your knob set screw loose?
....Dave
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On 3/20/23 9:28 PM, Dave via groups.io wrote: Hello everyone,
Last summer I picked up a 2-C to go with my 2-NT.
I have been using it for CW without any troubles.
I tried to listen to some SSB signals tonight and I found a problem...
I cannot tune in the SSB signals, the mode control just spins around and has no effect.
This is the first time I have tried to listen to SSB so this is new to me.
Looking at the schematic before I open it up it looks like the mode switch should have a few positions to it and not just spin around.
Am I correct?
Thanks much,
Dave KC3AM
|
One caution!
If the knob is loose, please do NOT overtighten the set screw. This will surely result in the knob being stripped or split.?
If it's loose because the shaft is hard to turn, remove the knob and fix the problem preventing the rotation (usually some thin oil in the shaft/bushing of the control) , then reattach the knob.
You got this!
John K5MO
On Tue, Mar 21, 2023 at 8:34?AM Dave Edwards < kd2e@...> wrote: A normal selector switch.
Is your knob set screw loose?
....Dave
On 3/20/23 9:28 PM, Dave via wrote:
> Hello everyone,
>
> Last summer I picked up a 2-C to go with my 2-NT.
> I have been using it for CW without any troubles.
> I tried to listen to some SSB signals tonight and I found a problem...
>
> I cannot tune in the SSB signals, the mode control just spins around
> and has no effect.
>
> This is the first time I have tried to listen to SSB so this is new to
> me.
>
> Looking at the schematic before I open it up it looks like the mode
> switch should have a few positions to it and not just spin around.
>
> Am I correct?
>
> Thanks much,
>
> Dave KC3AM
>
>
>
>
>
>
|
Gary, Dave, John,
Thanks for the replies!
I removed the knob this afternoon and it is in good shape.
It looks like the set screw presses against a fiber like bushing that surrounds the shaft and this presses against the shaft for a tight fit.
It did not feel stuck but I cannot turn it by just grabbing the shaft with my fingers.
The shaft is round without a flat spot so I guess it is just a tight compression fit that does the work.
I can move the switch to all three positions with a pair of pliers and LSB/USB works just fine !!!
I may open it up and look at the underside and then try some lubricant of some sort on the shaft, any suggestions?
I have WD40 & PB Blaster here to loosen it up some to start but maybe some kind of light oil after that?
Dave KC3AM
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On 3/20/2023 9:50 PM, Gary Follett wrote: That knob should most certainly operate with a click at each position, allowing reception of AM, USB and LSB/CW.
There are two possibilities. One is simple, that the set screw for the knob is loose. I think this is a setscrew type knob¡
If the set screw is very tight but you still cannot get a switch action, remove the knob and have a look at the shaft. Try to turn it gently with a pliers. If you get the same result, remove the cover and have a look at the coupling between the small inner shaft and the switch behind it to see if it is loose or broken. That coupling is below the chassis (underside) towards the back, with the shaft going between the coils of the bandpass filter coils.
Try that. If no joy, I have the last possibility you. Don¡¯t want to hear unless you are really good at repair work.
Gary
W0DVN
On Mar 20, 2023, at 8:28 PM, Dave via groups.io <kc3am@...> wrote:
Hello everyone,
Last summer I picked up a 2-C to go with my 2-NT.
I have been using it for CW without any troubles.
I tried to listen to some SSB signals tonight and I found a problem...
I cannot tune in the SSB signals, the mode control just spins around and has no effect.
This is the first time I have tried to listen to SSB so this is new to me.
Looking at the schematic before I open it up it looks like the mode switch should have a few positions to it and not just spin around.
Am I correct?
Thanks much,
Dave KC3AM
|
For a temporary fix, what you suggest is OK. Others have had success with WD-40 in this application.
If it were MY receiver, I would remove the switch, disassemble the bushing/shaft assembly, thoroughly clean the old grease out and polish both the shaft and bushing with microfine polishing compound. I use lithium grease for reassembly, just a tiny bit.
The trick to disassembling the shaft/bushing assembly is prying the wire ring in front of the bushing, as this holds the shaft into the bushing. It is not spring steel so you can bend it to get it off and then clamp it back into place when you are done. ?Be sure to not lose the little ball bearing that acts to locate the switch at its positions.
Gary
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On Mar 21, 2023, at 4:17 PM, Dave via groups.io <kc3am@...> wrote:
Gary, Dave, John,Thanks for the replies!I removed the knob this afternoon and it is in good shape.It looks like the set screw presses against a fiber like bushing that surrounds the shaft and this presses against the shaft for a tight fit.It did not feel stuck but I cannot turn it by just grabbing the shaft with my fingers.The shaft is round without a flat spot so I guess it is just a tight compression fit that does the work.I can move the switch to all three positions with a pair of pliers and LSB/USB works just fine !!!I may open it up and look at the underside and then try some lubricant of some sort on the shaft, any suggestions?I have WD40 & PB Blaster here to loosen it up some to start but maybe some kind of light oil after that?Dave KC3AMOn 3/20/2023 9:50 PM, Gary Follett wrote:That knob ?should most certainly operate with a click at each position, allowing reception of AM, USB and LSB/CW.
There are two possibilities. One is simple, that the set screw for the knob is loose. I think this is a setscrew type knob¡
If the set screw is very tight but you still cannot get a switch action, remove the knob and have a look at the shaft. Try to turn it gently with a pliers. If you get the same result, remove the cover and have a look at the coupling between the small inner shaft and the switch behind it to see if it is loose or broken. That coupling is below the chassis (underside) towards the back, with the shaft going between the coils of the bandpass filter coils.
Try that. If no joy, I have the last possibility you. Don¡¯t want to hear unless you are really good at repair work.
Gary
W0DVN
On Mar 20, 2023, at 8:28 PM, Dave via groups.io <kc3am@...> wrote:
Hello everyone,
Last summer I picked up a 2-C to go with my 2-NT.
I have been using it for CW without any troubles.
I tried to listen to some SSB signals tonight and I found a problem...
I cannot tune in the SSB signals, the mode control just spins around and has no effect.
This is the first time I have tried to listen to SSB so this is new to me.
Looking at the schematic before I open it up it looks like the mode switch should have a few positions to it and not just spin around.
Am I correct?
Thanks much,
Dave KC3AM
|
I would first check really carefully...with a loupe or magnifying glass, and a STRONG light to see if the existing knob is not already split perhaps.
As far as the control itself...I would avoid spray stuff.
I'd suggest a thin oil, with a toothpick. study the control carefully, finding the bearing points. Drop one drop of oil wherever you see the point where something supports the rotation (perhaps front and rear bearing??)
Again, a strong lamp is key. Be nice to the 2C. It is an amazing, and trailblazing rig!!
...Dave? KD2E
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On 3/21/23 5:17 PM, Dave via groups.io wrote: Gary, Dave, John,
Thanks for the replies!
I removed the knob this afternoon and it is in good shape.
It looks like the set screw presses against a fiber like bushing that surrounds the shaft and this presses against the shaft for a tight fit.
It did not feel stuck but I cannot turn it by just grabbing the shaft with my fingers.
The shaft is round without a flat spot so I guess it is just a tight compression fit that does the work.
I can move the switch to all three positions with a pair of pliers and LSB/USB works just fine !!!
I may open it up and look at the underside and then try some lubricant of some sort on the shaft, any suggestions?
I have WD40 & PB Blaster here to loosen it up some to start but maybe some kind of light oil after that?
Dave KC3AM
On 3/20/2023 9:50 PM, Gary Follett wrote:
That knob? should most certainly operate with a click at each position, allowing reception of AM, USB and LSB/CW.
There are two possibilities. One is simple, that the set screw for the knob is loose. I think this is a setscrew type knob¡
If the set screw is very tight but you still cannot get a switch action, remove the knob and have a look at the shaft. Try to turn it gently with a pliers. If you get the same result, remove the cover and have a look at the coupling between the small inner shaft and the switch behind it to see if it is loose or broken. That coupling is below the chassis (underside) towards the back, with the shaft going between the coils of the bandpass filter coils.
Try that. If no joy, I have the last possibility you. Don¡¯t want to hear unless you are really good at repair work.
Gary
W0DVN
On Mar 20, 2023, at 8:28 PM, Dave via groups.io <kc3am@...> wrote:
Hello everyone,
Last summer I picked up a 2-C to go with my 2-NT.
I have been using it for CW without any troubles.
I tried to listen to some SSB signals tonight and I found a problem...
I cannot tune in the SSB signals, the mode control just spins around and has no effect.
This is the first time I have tried to listen to SSB so this is new to me.
Looking at the schematic before I open it up it looks like the mode switch should have a few positions to it and not just spin around.
Am I correct?
Thanks much,
Dave KC3AM
|
I've never worked on a 2C, but did I read that the shaft (or bushing?) is made of a fibrous material? If so, will that absorb oil and expand?
Thanks,
Barry - N4BUQ
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----- Original Message ----- From: "Dave Edwards" <kd2e@...>
To: "DRAKE-RADIO" <[email protected]>
Cc: "Gary Follett" <xntrick1948@...>
Sent: Wednesday, March 22, 2023 6:51:25 AM
Subject: Re: [DRAKE-RADIO] 2-C Receiver I would first check really carefully...with a loupe or magnifying glass,
and a STRONG light to see if the existing knob is not already split perhaps.
As far as the control itself...I would avoid spray stuff.
I'd suggest a thin oil, with a toothpick. study the control carefully,
finding the bearing points. Drop one drop of oil wherever you see the
point where something supports the rotation (perhaps front and rear
bearing??)
Again, a strong lamp is key. Be nice to the 2C. It is an amazing, and
trailblazing rig!!
...Dave? KD2E
On 3/21/23 5:17 PM, Dave via groups.io wrote:
Gary, Dave, John,
Thanks for the replies!
I removed the knob this afternoon and it is in good shape.
It looks like the set screw presses against a fiber like bushing that
surrounds the shaft and this presses against the shaft for a tight fit.
It did not feel stuck but I cannot turn it by just grabbing the shaft
with my fingers.
The shaft is round without a flat spot so I guess it is just a tight
compression fit that does the work.
I can move the switch to all three positions with a pair of pliers and
LSB/USB works just fine !!!
I may open it up and look at the underside and then try some lubricant
of some sort on the shaft, any suggestions?
I have WD40 & PB Blaster here to loosen it up some to start but maybe
some kind of light oil after that?
Dave KC3AM
On 3/20/2023 9:50 PM, Gary Follett wrote:
That knob? should most certainly operate with a click at each
position, allowing reception of AM, USB and LSB/CW.
There are two possibilities. One is simple, that the set screw for
the knob is loose. I think this is a setscrew type knob¡
If the set screw is very tight but you still cannot get a switch
action, remove the knob and have a look at the shaft. Try to turn it
gently with a pliers. If you get the same result, remove the cover
and have a look at the coupling between the small inner shaft and the
switch behind it to see if it is loose or broken. That coupling is
below the chassis (underside) towards the back, with the shaft going
between the coils of the bandpass filter coils.
Try that. If no joy, I have the last possibility you. Don¡¯t want to
hear unless you are really good at repair work.
Gary
W0DVN
On Mar 20, 2023, at 8:28 PM, Dave via groups.io
<kc3am@...> wrote:
Hello everyone,
Last summer I picked up a 2-C to go with my 2-NT.
I have been using it for CW without any troubles.
I tried to listen to some SSB signals tonight and I found a problem...
I cannot tune in the SSB signals, the mode control just spins around
and has no effect.
This is the first time I have tried to listen to SSB so this is new
to me.
Looking at the schematic before I open it up it looks like the mode
switch should have a few positions to it and not just spin around.
Am I correct?
Thanks much,
Dave KC3AM
|
Dave, I just took a quick look at mine and reminded myself how it works. The mode selector switch is inside the bandwidth selector switch (dual function). Most of the knobs are similar, though the shaft for the mode switch is much smaller in diameter. Drake used a fiber reducer bushing to bridge the gap, and the set screw squeezes the bushing into the needed "D" shape for the shaft. There's another small fiber bushing on the shaft to isolate it from the bandwidth selector. If your mode shaft turns easily with pliers, your problem is with the reducer bushing. Unlike the other knobs, tightening that knob it a bit touchier. It never gets fully tight like it would on a fill-sized shaft. Perhaps a previous owner stripped it out. I suspect you could substitute it with another knob by retrieving the reducer bushing.?   -- 73 de Steve K9NUD .. Nothing happens until someone calls CQ!
|
The 4 lines use the same knob setup.. except there is only one phenolic reducer.? And, it has a split in its side? so it can shrink as the screw is tightened.
Maybe you do not need 2 bushings?? Maybe they are backwards (swapped)?
And, that is the worst rusty looking switch I have seen, must need lubrication and cleaning.
73,
Gary
WB6OGD
|
On Thu, Mar 23, 2023 at 10:10 AM, wb6ogd wrote:
The 4 lines use the same knob setup.. except there is only one phenolic reducer.? And, it has a split in its side? so it can shrink as the screw is tightened.
Maybe you do not need 2 bushings?? Maybe they are backwards (swapped)?
And, that is the worst rusty looking switch I have seen, must need lubrication and cleaning.
73,
Gary
WB6OGD
The config in my photos is stock. The bushing on the shaft is there to isolate the mode knob from the bandwidth selector. Yes, this rig had some corrosion from humid storage. But that's merely cosmetic on the outside. All switch movement works perfectly. I got the complete 2-C, 2-NT, and 2-CQ station for a very low price. They are very early production units with serial numbers in the 40's. The 2-C had a broken crystal switch on the side, otherwise they merely needed recapping. One rectifier was bad but was easy to diagnose due to the smoke (hi). Works like a charm! ? -- 73 de Steve K9NUD .. Nothing happens until someone calls CQ!
|
Attached is a picture of my knob and switch. It is not as rusty as the other picture.
The shaft does have a flat spot on it and there is a bushing inside the knob.
Unfortunately the set screw hole does seem to be stripped and will not tighten.
Dave KC3AM
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On 3/20/2023 9:28 PM, Dave via groups.io wrote: Hello everyone,
Last summer I picked up a 2-C to go with my 2-NT.
I have been using it for CW without any troubles.
I tried to listen to some SSB signals tonight and I found a problem...
I cannot tune in the SSB signals, the mode control just spins around and has no effect.
This is the first time I have tried to listen to SSB so this is new to me.
Looking at the schematic before I open it up it looks like the mode switch should have a few positions to it and not just spin around.
Am I correct?
Thanks much,
Dave KC3AM
|
If the knob isn¡¯t split, try tapping for a larger setscrew.?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent from Proton Mail for iOS
On Sun, Mar 26, 2023 at 14:09, Dave via groups.io < kc3am@...> wrote: Attached is a picture of my knob and switch. It is not as rusty as the
other picture.
The shaft does have a flat spot on it and there is a bushing inside the
knob.
Unfortunately the set screw hole does seem to be stripped and will not
tighten.
Dave KC3AM
On 3/20/2023 9:28 PM, Dave via groups.io wrote:
> Hello everyone,
>
> Last summer I picked up a 2-C to go with my 2-NT.
> I have been using it for CW without any troubles.
> I tried to listen to some SSB signals tonight and I found a problem...
>
> I cannot tune in the SSB signals, the mode control just spins around
> and has no effect.
>
> This is the first time I have tried to listen to SSB so this is new to
> me.
>
> Looking at the schematic before I open it up it looks like the mode
> switch should have a few positions to it and not just spin around.
>
> Am I correct?
>
> Thanks much,
>
> Dave KC3AM
>
>
>
>
>
>
|
On Sun, Mar 26, 2023 at 01:09 PM, Dave wrote:
Attached is a picture of my knob and switch. It is not as rusty as the
other picture.
The shaft does have a flat spot on it and there is a bushing inside the
knob.
Unfortunately the set screw hole does seem to be stripped and will not
tighten.
?
Dave, it appears someone lost the original reducer bushing and attempted to use the separator bushing instead. No wonder they stripped it out. The two bushings are not identical. As you can see in my photo, the insert has the necessary D shape. I'd recommend putting that bushing back on the shaft and trying various available materials to make a new reducer insert for the knob. If the knob isn't split, perhaps you can drill and tap for a larger set screw.? -- 73 de Steve K9NUD ..
|
KNOB SPRINGS
LECTRA Fasteners (Arvada, CO)
Manufacturer of D, D with barbs and double-D inserts used with control knobs
CATALOG
greg, w9gb
chicago
|
Man, that's an obscure niche product line.
Great find! John
KNOB SPRINGS
LECTRA Fasteners (Arvada, CO)
Manufacturer of D, D with barbs and double-D inserts used with control knobs
CATALOG
greg, w9gb
chicago
|
The ones at AES look identical to the ones I have seen in some of my Collins knobs.? It may be time to experiment and see if they'd work with the Drake knobs that have no setscrew.? Many times, those screwless knobs get loose due to the spring wearing out.
I'll pull one off my second Collins receiver and try it on my TR-4Cw RIT, as that rig will be visiting the bench soon to look at the Squirrely behaviour on 20m.
73,
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
------- Original Message -------
On Tuesday, March 28th, 2023 at 8:13 AM, John K5MO <johnk5mo@...> wrote:
Man, that's an obscure niche product line.
Great find! John
KNOB SPRINGS
LECTRA Fasteners (Arvada, CO)
Manufacturer of D, D with barbs and double-D inserts used with control knobs
CATALOG
greg, w9gb
chicago
|
Steve K9NUD
Gary WB6OGD
Greg W9GB