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Re: MN2000 bandswitch parts and capacitor info needed

 

Hi Tom
?
I havent run across anything online yet about capacitor failures in the MN2000 but have read about a few bandswitch issues.?
In this one both the original bandswitch and original capacitors are all gone and replaced with poor substitutions, so not sure what problem the prev owner had or if they just did a poor shotgun approach in trying to fix it.? Everything else inside and out on this one look very nice so I really hope to get it restored.
Hopefully others on the group will give us some good insight into this.
?
Thanks
Craig KE5CHT


Re: MN2000 bandswitch parts and capacitor info needed

 

Following this closely as I was wondering if the original caps ever go bad. Havent had time to do any checking on this MN-2000 other than when I threw it in line. In place of a Palstar a few months back it just acted sort of flaky. It also was a clean hamfest find I purchased to go with my ongoing C-Line project. Any insight to my question greatly appreciated.?
? ? ?tnx, Tom W2TF

On Thursday, January 16, 2025 at 05:58:42 PM EST, DB via groups.io <crdonmax1@...> wrote:


Greetings,
I'm still hoping to find someone who may have info/specs on the original MN-2000 fixed bandswitch capacitors (C12-C15).? These are the larger rectangular mica capacitors mounted below the bandswitch. (A previous owner had removed all the mica caps and installed some small disc caps in their place.
I have the capacitance values but I am concerned in finding suitable capacitors that would be rated to handle the full power rating and RF current that they could be subjected to.
If anyone has pics or specs of the originals with Mfg part number etc,, please let me know.
Thanks again
Craig KE5CHT
?


Re: R4C Sherwood audio mod questions

 

Hi Bill.? The roughness I'm hearing isn't bad at all, but I will take a look at that supply line next time I have the receiver opened up.? Thanks.
?
73, Floyd


Re: TR-4C Problems with 28.0 and 28.5 bands

 

Are you sure they are the RIGHT crystals?
10meters is ripe for CB conversions.? Sometimes that doesn't work but the crystals may remain...
?
Also, you will find most R-4x receivers with a lot of random crystals plugged in the extra crystal bank.
They are not right but they do give some extra coverage for some fun SWL operation. The 100KHz calibrator signals do not come up in the
right place but...
?
73,
Gary
WB6OGD
?


Re: MN2000 bandswitch parts and capacitor info needed

 

Greetings,
I'm still hoping to find someone who may have info/specs on the original MN-2000 fixed bandswitch capacitors (C12-C15).? These are the larger rectangular mica capacitors mounted below the bandswitch. (A previous owner had removed all the mica caps and installed some small disc caps in their place.
I have the capacitance values but I am concerned in finding suitable capacitors that would be rated to handle the full power rating and RF current that they could be subjected to.
If anyone has pics or specs of the originals with Mfg part number etc,, please let me know.
Thanks again
Craig KE5CHT
?


Re: Drake Ad from Feb "73"

 

Scary, but very true !

Long live qrp, homebrew and reperable "vintage".

Nor sure my CR100 would qualify for the third category,
but I might get brave enough to try one day...

Michael 2E0IHW

On 2025-01-15 21:36, Clint VE3CMQ wrote:
The newer rigs are great but good luck if they fail.
They really aren¡¯t repairable after a few years


Re: Drake Ad from Feb "73"

 

On 2025-01-15 21:36, Clint VE3CMQ wrote:
The newer rigs are great but good luck if they fail.
They really aren¡¯t repairable after a few years
*** Yup. I was on the West Coast swap net a few weekends ago with my Signal/One. The
net control congratulated me for succeeding in fixing the thing. I told him it wasn't that
bad. Mostly discrete components, schematics available. Some of the parts hard to find, but
none impossible.

Compare that to a modern rig with a big ASIC in the middle - 200 pins, surface mount, maybe
BGA, no real data. My FTDX10 has a problem with the CAT control over USB; I found the responsible chip, and replaced it. Still no USB CAT. No possibility of troubleshooting it - to get at that side of the main board, you have to undo approximately umpteen cables around the perimeter of the board. You can get the board out, but it ain't gonna work with everything disconnected. I talked to tech support at Yaesu - they don't fix'em either. They just replace. That'll be about a grand, please.

- Jerry, KF6VB


Re: TR-4C Problems with 28.0 and 28.5 bands

 

yes, the Xtals are there. Just not working.
73, Dave KD5FX


Re: T4XB/R4B Transceive problem

 

On 2025-01-16 11:25, Steve Wedge, W1ES/4 via groups.io wrote:
I¡¯ve got a Tek 2465, so it doesn¡¯t measure exact frequency.
*** But it's a damn fine scope. I've got a 2445. I've had it
for 30 years. A few years ago, one of the AC input safety capacitors
gave up the ghost, and also the fan got loose. Replaced the cap,
epoxied the fan back together, and it's all good.

- Jerry, KF6VB


Re: T4XB/R4B Transceive problem

 

¿ªÔÆÌåÓý

Mine compares close to my HP counter. Lucky I guess. We¡¯ll see how it sounds on the air Friday. :-)



On Jan 16, 2025, at 1:25?PM, Steve Wedge, W1ES/4 via groups.io <w1es@...> wrote:

?
I¡¯ve got a Tek 2465, so it doesn¡¯t measure exact frequency.?

Steve Wedge, W1ES

Time flies like an arrow. Fruit flies like a banana.


Sent from for iOS


On Thu, Jan 16, 2025 at 13:41, Tony Sokol via groups.io <tony.sokol@...> wrote:
Thanks for the feedback. Rather than another receiver I used a scope and it does show a dip. My digital scope also has a built in frequency counter display which matches my HP counter exactly.?

Tony


On Jan 16, 2025, at 6:37?AM, Steve Wedge, W1ES/4 via groups.io <w1es@...> wrote:

?
Lately, my go-to for setting C2 has been setting my IC-7610 to 5645 and setting it to CW. I listen to the note on CW and reverse CW. I can also see the carrier on the spectrum display but the correct frequency is there when the beat notes are the same on CW and CW-R. Much better than trying for zero beat in SSB.?

Setting the carrier null is easy using a scope.?

I¡¯ve not found a really good way of setting the filter match than using the method in the manual, so you will be messing with the balance adjustment and C2 no matter what.?

BTW, it¡¯s easier as well to use a scope to watch the amplitude of the transmitted signal, if you otherwise prefer using the by the book method.?

73,

Steve Wedge, W1ES

Time flies like an arrow. Fruit flies like a banana.


Sent from for iOS


On Thu, Jan 16, 2025 at 02:29, Richard Knoppow via groups.io < 1oldlens1@...> wrote:
If the carrier balance adjustment does nothing something is
seriously wrong. Go over the carrier balance adjustment on P,15 of the
handbook. The balance control should show an definite null. It is more
common that a good null can not be achieved than that the modulator can
not be unbalanced but in either case something is wrong. When working
properly the balanced modulator has a very good null, you really need to
set it using a receiver lightly coupled to the output. C-6 will affect
the null but usually in making it impossible to get a null.
Go over the adjustments again and see what you find. I am disturbed
that the original problem may not have been a bad filter but whatever is
causing this to happen.
A story: when I first got my T4XB I could not null the carrier.
After I got Garry's discs I found the wiring in the photographs didn't
look write. I asked Garry and he confirmed that what was in mine was not
correct, although it looked factory. In fact, the circuit is quite
sensitive to stray capacitance. With the wires as they were the
modulator could not be balanced. I moved them and got the correct deep
null. So, look for something out of place. You should be able to get a
substantial amount of carrier by unbalancing the pot. Actually, you need
it for alignment.
On 1/15/2025 10:28 PM, Tony Sokol via groups.io wrote:
> ?Hi Gang,
> I thought I¡¯d update my progress on the T4XB filter issue that I brought up just before Christmas. I found that I had the mate for the blue USB filter I had mounted years ago. Mounting the new filter which is on the bottom was exciting. Now they match pretty well. I was not able to match them per the manual though. You are told to unbalance the balanced modulator by turning the pot fully CCW. This did nothing so I didn¡¯t have a carrier feeding the filters to balance. Rather than detuning the coil possibly opening another can of worms, I simply went to transceive mode and tuned C2 till they ¡°birdied in¡±. Then I went back and forth between upper and lower sideband listening to myself. Not only did it sound good but the transmitter oscillator ended up on 5.645008. Close enough. The acid test will come when I check in with the Friday evening gang. Hopefully they will not tell me my shorts are way too tight. ?
> Thank you for all the help and suggestions.
>

--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998







Re: T4XB/R4B Transceive problem

 

I¡¯ve got a Tek 2465, so it doesn¡¯t measure exact frequency.?

Steve Wedge, W1ES

Time flies like an arrow. Fruit flies like a banana.


Sent from for iOS


On Thu, Jan 16, 2025 at 13:41, Tony Sokol via groups.io <tony.sokol@...> wrote:
Thanks for the feedback. Rather than another receiver I used a scope and it does show a dip. My digital scope also has a built in frequency counter display which matches my HP counter exactly.?

Tony


On Jan 16, 2025, at 6:37?AM, Steve Wedge, W1ES/4 via groups.io <w1es@...> wrote:

?
Lately, my go-to for setting C2 has been setting my IC-7610 to 5645 and setting it to CW. I listen to the note on CW and reverse CW. I can also see the carrier on the spectrum display but the correct frequency is there when the beat notes are the same on CW and CW-R. Much better than trying for zero beat in SSB.?

Setting the carrier null is easy using a scope.?

I¡¯ve not found a really good way of setting the filter match than using the method in the manual, so you will be messing with the balance adjustment and C2 no matter what.?

BTW, it¡¯s easier as well to use a scope to watch the amplitude of the transmitted signal, if you otherwise prefer using the by the book method.?

73,

Steve Wedge, W1ES

Time flies like an arrow. Fruit flies like a banana.


Sent from for iOS


On Thu, Jan 16, 2025 at 02:29, Richard Knoppow via groups.io < 1oldlens1@...> wrote:
If the carrier balance adjustment does nothing something is
seriously wrong. Go over the carrier balance adjustment on P,15 of the
handbook. The balance control should show an definite null. It is more
common that a good null can not be achieved than that the modulator can
not be unbalanced but in either case something is wrong. When working
properly the balanced modulator has a very good null, you really need to
set it using a receiver lightly coupled to the output. C-6 will affect
the null but usually in making it impossible to get a null.
Go over the adjustments again and see what you find. I am disturbed
that the original problem may not have been a bad filter but whatever is
causing this to happen.
A story: when I first got my T4XB I could not null the carrier.
After I got Garry's discs I found the wiring in the photographs didn't
look write. I asked Garry and he confirmed that what was in mine was not
correct, although it looked factory. In fact, the circuit is quite
sensitive to stray capacitance. With the wires as they were the
modulator could not be balanced. I moved them and got the correct deep
null. So, look for something out of place. You should be able to get a
substantial amount of carrier by unbalancing the pot. Actually, you need
it for alignment.
On 1/15/2025 10:28 PM, Tony Sokol via groups.io wrote:
> ?Hi Gang,
> I thought I¡¯d update my progress on the T4XB filter issue that I brought up just before Christmas. I found that I had the mate for the blue USB filter I had mounted years ago. Mounting the new filter which is on the bottom was exciting. Now they match pretty well. I was not able to match them per the manual though. You are told to unbalance the balanced modulator by turning the pot fully CCW. This did nothing so I didn¡¯t have a carrier feeding the filters to balance. Rather than detuning the coil possibly opening another can of worms, I simply went to transceive mode and tuned C2 till they ¡°birdied in¡±. Then I went back and forth between upper and lower sideband listening to myself. Not only did it sound good but the transmitter oscillator ended up on 5.645008. Close enough. The acid test will come when I check in with the Friday evening gang. Hopefully they will not tell me my shorts are way too tight. ?
> Thank you for all the help and suggestions.
>

--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998







TR7 - Early version 2nd Mixer Schematic and Pictorial Information (description of parts on the board)

 

Greetings all,
?
I am in the need of the schematic and pictorial information for the early series 2nd Mixer Boards. I have only found late version ones. I went through most of the threads regarding the 2nd mixer but I could not find what I need.
As I am trying to convert an early version board into a late version one, I do not want to ruin it doing something silly.
I have quite a bit of information to do the conversion, obtained in the different threads I went through.
My other concern is T701. On the board I have there is a transformer and I am supposed to replace it with a tapped coil. As I have no info on the tapped coil, my plan is to leave the transformer untouched and try the board.
May I ask you for comments, which will be very appreciated.
?
73 de Raoul CE3RY


Re: T4XB/R4B Transceive problem

 

¿ªÔÆÌåÓý

Thanks for the feedback. Rather than another receiver I used a scope and it does show a dip. My digital scope also has a built in frequency counter display which matches my HP counter exactly.?

Tony


On Jan 16, 2025, at 6:37?AM, Steve Wedge, W1ES/4 via groups.io <w1es@...> wrote:

?
Lately, my go-to for setting C2 has been setting my IC-7610 to 5645 and setting it to CW. I listen to the note on CW and reverse CW. I can also see the carrier on the spectrum display but the correct frequency is there when the beat notes are the same on CW and CW-R. Much better than trying for zero beat in SSB.?

Setting the carrier null is easy using a scope.?

I¡¯ve not found a really good way of setting the filter match than using the method in the manual, so you will be messing with the balance adjustment and C2 no matter what.?

BTW, it¡¯s easier as well to use a scope to watch the amplitude of the transmitted signal, if you otherwise prefer using the by the book method.?

73,

Steve Wedge, W1ES

Time flies like an arrow. Fruit flies like a banana.


Sent from for iOS


On Thu, Jan 16, 2025 at 02:29, Richard Knoppow via groups.io <1oldlens1@...> wrote:
If the carrier balance adjustment does nothing something is
seriously wrong. Go over the carrier balance adjustment on P,15 of the
handbook. The balance control should show an definite null. It is more
common that a good null can not be achieved than that the modulator can
not be unbalanced but in either case something is wrong. When working
properly the balanced modulator has a very good null, you really need to
set it using a receiver lightly coupled to the output. C-6 will affect
the null but usually in making it impossible to get a null.
Go over the adjustments again and see what you find. I am disturbed
that the original problem may not have been a bad filter but whatever is
causing this to happen.
A story: when I first got my T4XB I could not null the carrier.
After I got Garry's discs I found the wiring in the photographs didn't
look write. I asked Garry and he confirmed that what was in mine was not
correct, although it looked factory. In fact, the circuit is quite
sensitive to stray capacitance. With the wires as they were the
modulator could not be balanced. I moved them and got the correct deep
null. So, look for something out of place. You should be able to get a
substantial amount of carrier by unbalancing the pot. Actually, you need
it for alignment.
On 1/15/2025 10:28 PM, Tony Sokol via groups.io wrote:
> ?Hi Gang,
> I thought I¡¯d update my progress on the T4XB filter issue that I brought up just before Christmas. I found that I had the mate for the blue USB filter I had mounted years ago. Mounting the new filter which is on the bottom was exciting. Now they match pretty well. I was not able to match them per the manual though. You are told to unbalance the balanced modulator by turning the pot fully CCW. This did nothing so I didn¡¯t have a carrier feeding the filters to balance. Rather than detuning the coil possibly opening another can of worms, I simply went to transceive mode and tuned C2 till they ¡°birdied in¡±. Then I went back and forth between upper and lower sideband listening to myself. Not only did it sound good but the transmitter oscillator ended up on 5.645008. Close enough. The acid test will come when I check in with the Friday evening gang. Hopefully they will not tell me my shorts are way too tight. ?
> Thank you for all the help and suggestions.
>

--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998







Re: TR-4C Problems with 28.0 and 28.5 bands

 

Ah, so the two lower crystals seem to be not working. Try baking them at about 350F for a few hours. ?Put them on tinfoil so that you don¡¯t upset any family member by soldering a cookie sheet¡­

After they cool, try them again.

Steve Wedge, W1ES

Time flies like an arrow. Fruit flies like a banana.




On Thu, Jan 16, 2025 at 12:24 PM, Dave KD5FX via groups.io <land.dave@...> wrote:
You're referring to the 5-10 section, correct? Injection Crystal Oscillator adjustment. Thanks for the tip about using a scope instead of the VTVM, that worked much better for me. I was pretty close with the VTVM but got a better adjustment with the scope. So that is correct now and 29.1 is working (but weak signals on the CAL). But using my signal generator at 29.4 MHZ I'm getting an S9 which is the same signal I'm getting on my Flex Radio at that freq so I think the 29.1 band is working OK, there's just no signals out there to listen to on SSB, I do hear an FM signal at 29.620 which sounds like garbage of course on the Drake.?
So? Anything else I should check before ordering a Xtal?
73, Dave KD5FX
?


Re: TR-4C Problems with 28.0 and 28.5 bands

 

¿ªÔÆÌåÓý

Let¡¯s not get ahead of ourselves. ?Does the rig have the necessary crystals to operate on those two band segments? ?My TR4Cw came without them.
Bill AE8EA


On Jan 16, 2025, at 12:24 PM, Dave KD5FX via groups.io <land.dave@...> wrote:

?
You're referring to the 5-10 section, correct? Injection Crystal Oscillator adjustment. Thanks for the tip about using a scope instead of the VTVM, that worked much better for me. I was pretty close with the VTVM but got a better adjustment with the scope. So that is correct now and 29.1 is working (but weak signals on the CAL). But using my signal generator at 29.4 MHZ I'm getting an S9 which is the same signal I'm getting on my Flex Radio at that freq so I think the 29.1 band is working OK, there's just no signals out there to listen to on SSB, I do hear an FM signal at 29.620 which sounds like garbage of course on the Drake.?
So? Anything else I should check before ordering a Xtal?
73, Dave KD5FX
?


Re: TR-4C Problems with 28.0 and 28.5 bands

 

You're referring to the 5-10 section, correct? Injection Crystal Oscillator adjustment. Thanks for the tip about using a scope instead of the VTVM, that worked much better for me. I was pretty close with the VTVM but got a better adjustment with the scope. So that is correct now and 29.1 is working (but weak signals on the CAL). But using my signal generator at 29.4 MHZ I'm getting an S9 which is the same signal I'm getting on my Flex Radio at that freq so I think the 29.1 band is working OK, there's just no signals out there to listen to on SSB, I do hear an FM signal at 29.620 which sounds like garbage of course on the Drake.?
So? Anything else I should check before ordering a Xtal?
73, Dave KD5FX
?


Re: TR-4C Problems with 28.0 and 28.5 bands

 

I would start by inspecting all of the tabs on the rotary switches associated with the band selector rod to make sure they are not damaged and deox and clean them.? While you are under there inspect all of the wiring to the trimmers and make sure you don't have any opens like a capacitor leg that got separated or something.? T8 and T10 in particular are associated with the 10m band.? Tighten all the screws everywhere you can.? I doubt you have multiple bad xtals all for the same band.? Those xtals are more prone to drift but drift is just going to shift the frequency a bit.? My guess is something associated with T8 or T10 trimmers.??

On Thursday, January 16, 2025 at 09:04:18 AM CST, Dave KD5FX via groups.io <land.dave@...> wrote:


I just picked up this TR-4C a couple of weeks ago and I'm going through it, everything is working fine except both the 28.0 and 28.5 bands do not work. I receive nothing and can't hear the CAL oscillator either. The 29.1 band is working OK but signals are weak. I thought it might be the Xtals so I swapped them around to see what happened. I put the 28.0 Xtal in the 29.1 band position and got nothing, same with the 28.5 Xtal. Then I put the 29.1 Xtal in the 28.0 band position and a tiny bit of signal by peaking the RF Tune but no CAL heard. When I put the 29.1 in 28.5 I got a little band noise I could peak but no CAL signal. I did check all the tubes and they are good.?
So? Does that sound like two bad Xtals or is something else bad?
Thanks in advance & 73, Dave KD5FX
?


Re: TR-4C Problems with 28.0 and 28.5 bands

 

It could be crystals but it could also be that the 10m oscillator is out of adjustment.?

Make sure that the 10m oscillator is peaked per the procedure. You can use either a VTVM or a scope for this.?

Having two bad crystals makes me think ¡°check the oscillator first¡±.

Steve Wedge, W1ES

Time flies like an arrow. Fruit flies like a banana.


Sent from for iOS


On Thu, Jan 16, 2025 at 10:04, Dave KD5FX via groups.io <land.dave@...> wrote:
I just picked up this TR-4C a couple of weeks ago and I'm going through it, everything is working fine except both the 28.0 and 28.5 bands do not work. I receive nothing and can't hear the CAL oscillator either. The 29.1 band is working OK but signals are weak. I thought it might be the Xtals so I swapped them around to see what happened. I put the 28.0 Xtal in the 29.1 band position and got nothing, same with the 28.5 Xtal. Then I put the 29.1 Xtal in the 28.0 band position and a tiny bit of signal by peaking the RF Tune but no CAL heard. When I put the 29.1 in 28.5 I got a little band noise I could peak but no CAL signal. I did check all the tubes and they are good.?
So? Does that sound like two bad Xtals or is something else bad?
Thanks in advance & 73, Dave KD5FX
?


TR-4C Problems with 28.0 and 28.5 bands

 

I just picked up this TR-4C a couple of weeks ago and I'm going through it, everything is working fine except both the 28.0 and 28.5 bands do not work. I receive nothing and can't hear the CAL oscillator either. The 29.1 band is working OK but signals are weak. I thought it might be the Xtals so I swapped them around to see what happened. I put the 28.0 Xtal in the 29.1 band position and got nothing, same with the 28.5 Xtal. Then I put the 29.1 Xtal in the 28.0 band position and a tiny bit of signal by peaking the RF Tune but no CAL heard. When I put the 29.1 in 28.5 I got a little band noise I could peak but no CAL signal. I did check all the tubes and they are good.?
So? Does that sound like two bad Xtals or is something else bad?
Thanks in advance & 73, Dave KD5FX
?


Re: T4XB/R4B Transceive problem

 

Lately, my go-to for setting C2 has been setting my IC-7610 to 5645 and setting it to CW. I listen to the note on CW and reverse CW. I can also see the carrier on the spectrum display but the correct frequency is there when the beat notes are the same on CW and CW-R. Much better than trying for zero beat in SSB.?

Setting the carrier null is easy using a scope.?

I¡¯ve not found a really good way of setting the filter match than using the method in the manual, so you will be messing with the balance adjustment and C2 no matter what.?

BTW, it¡¯s easier as well to use a scope to watch the amplitude of the transmitted signal, if you otherwise prefer using the by the book method.?

73,

Steve Wedge, W1ES

Time flies like an arrow. Fruit flies like a banana.


Sent from for iOS


On Thu, Jan 16, 2025 at 02:29, Richard Knoppow via groups.io <1oldlens1@...> wrote:
If the carrier balance adjustment does nothing something is
seriously wrong. Go over the carrier balance adjustment on P,15 of the
handbook. The balance control should show an definite null. It is more
common that a good null can not be achieved than that the modulator can
not be unbalanced but in either case something is wrong. When working
properly the balanced modulator has a very good null, you really need to
set it using a receiver lightly coupled to the output. C-6 will affect
the null but usually in making it impossible to get a null.
Go over the adjustments again and see what you find. I am disturbed
that the original problem may not have been a bad filter but whatever is
causing this to happen.
A story: when I first got my T4XB I could not null the carrier.
After I got Garry's discs I found the wiring in the photographs didn't
look write. I asked Garry and he confirmed that what was in mine was not
correct, although it looked factory. In fact, the circuit is quite
sensitive to stray capacitance. With the wires as they were the
modulator could not be balanced. I moved them and got the correct deep
null. So, look for something out of place. You should be able to get a
substantial amount of carrier by unbalancing the pot. Actually, you need
it for alignment.
On 1/15/2025 10:28 PM, Tony Sokol via groups.io wrote:
> ?Hi Gang,
> I thought I¡¯d update my progress on the T4XB filter issue that I brought up just before Christmas. I found that I had the mate for the blue USB filter I had mounted years ago. Mounting the new filter which is on the bottom was exciting. Now they match pretty well. I was not able to match them per the manual though. You are told to unbalance the balanced modulator by turning the pot fully CCW. This did nothing so I didn¡¯t have a carrier feeding the filters to balance. Rather than detuning the coil possibly opening another can of worms, I simply went to transceive mode and tuned C2 till they ¡°birdied in¡±. Then I went back and forth between upper and lower sideband listening to myself. Not only did it sound good but the transmitter oscillator ended up on 5.645008. Close enough. The acid test will come when I check in with the Friday evening gang. Hopefully they will not tell me my shorts are way too tight. ?
> Thank you for all the help and suggestions.
>

--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998