Re: DRAKE MN-2000 Ceramic wafer replacement/repair for Antenna Selector Switch help?
On Mon, Mar 13, 2023 at 07:31 PM, Paul Kraemer wrote:
Here is link to pictures of the switch.? Wish they were better pictures but that is all I have.? Ignore the paint finish pictures at end.? I also refinished the cabinet.
Paul K0UYA
On 3/13/2023 4:06 PM, Peter A wrote
Peter et al
I got the message(s) and I can help with that switch replacement.? I was able to find an inexpensive switch on ebay and "adapt" it to repair the MN200 to "better than new".? The switch is basically Soviet or Eastern Europe manufacture, rugged, fits same space.? The only mod to the switch is remove extra wafers from the back end and mount it backwards in the tuner.? You can cut the switch shaft short or leave it to protrude through the rear panel.? A shaft coupling is used to mate the Drake selector knob shaft extension to the new switch.? Both the switch shaft and the selector shaft are flatted and do not line up.? To ensure a sturdy coupling you need to drill a new set screw hole in the coupling to compensate for the alignment.? That makes the set screws land on the flatted shafts.? I made my own coupling from a short piece of 1/2" dia aluminum rod.? EASY and it stays indexed even if the screws are loose.
The Drake switch had back to back contacts on a single wafer.? The new switch I used two wafers wired together..
If the switch can't be found on ebay I have an extra.
I 'll find the picture file and hopefully someone can put them on the reflector archives.
IT IS A NICE REPAIR---NO KLUDGE.
Paul K0UYA
Paul, that sounds fantastic.? Anyhow, I like a challenge so wouldn't want an exact replacement anyway.? HIHI.? If you remember the ebay seller that'd be helpful also.
appreciate everything.
Thank you Paul.
Peter
VE9KX
|
? ? ? ? ? ? ? ?? Thanks for the pictures Paul.? I will do my best to find the same type of switch online.? Hopefully will have this antenna tuner operational again.
73
Peter VE9KX
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Jim,
Correct.? My TR-7 came with no noise blanker.? The woodpecker forced me to buy one.? The dummy board remains.? Thanks for pointing out that the dummy board was not part of the extender board set.
73, Tom, AG9X
On Mon, Mar 13, 2023 at 6:57?PM Jim Shorney < jimNU0C@...> wrote:
The NB-7 dummy board, a.k.a. IF Switching Board, was not a part of the Drake extender kit. It was only used for TR7s that did not have the NB-7 option.
73
-Jim
NU0C
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Re: What are the differances between the T4X and the T4XB
Garey K4OAH was the founder of this group. He probably forgot more about the 4-Line rigs that the rest of us will ever know. He was a true gentleman and is sorely missed. You can find his postings in the archive of this group and earlier in the Drakelist online archives. His XYL still sells the reference discs that he created. 73 -Jim NU0C On Mon, 13 Mar 2023 21:28:58 -0600 (MDT) "Richard Loken" <rlloken@...> wrote: On Mon, 13 Mar 2023, Jim Shorney wrote:
Answered by K4OAH.
Not too many changes at all. The bit about the striped crystals is hard
to get my head around but my R4 says it doesn't much matter.
Those messages accidently explained why I see R4s and T4Xs with a differant
(B line) knob than on my R4.
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Re: What are the differances between the T4X and the T4XB
On Mon, 13 Mar 2023, Jim Shorney wrote:
Answered by K4OAH.
Not too many changes at all. The bit about the striped crystals is hard to get my head around but my R4 says it doesn't much matter. Those messages accidently explained why I see R4s and T4Xs with a differant (B line) knob than on my R4. -- Richard Loken VE6BSV : "...underneath those tuques we wear, Athabasca, Alberta Canada : our heads are naked!" ** rlloken@... ** : - Arthur Black
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Re: What are the differances between the T4X and the T4XB
On Mon, 13 Mar 2023, Steve Wedge, W1ES/4 via groups.io wrote: The PLATE meter also went from 400 to 500 mA full scale. Mic jack moved to the side. It is interesting that the plate current meter was recalibrated to be a 500mA meter, the final should pull about 300mA so you would think 400mA full scale would do. Maybe too many overachievers pegged the meter. :) Putting the mic jack on the side is not a good thing IMHO but perfecton is hard to find. -- Richard Loken VE6BSV : "...underneath those tuques we wear, Athabasca, Alberta Canada : our heads are naked!" ** rlloken@... ** : - Arthur Black
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Re: What are the differances between the T4X and the T4XB
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The NB-7 dummy board, a.k.a. IF Switching Board, was not a part of the Drake extender kit. It was only used for TR7s that did not have the NB-7 option. 73 -Jim NU0C On Mon, 13 Mar 2023 17:56:33 -0500 "Tom Evans" <Tom.AG9X@...> wrote: John,
I scanned a full set of original Drake extender boards as well as the DR-7
jumper board and a NB-7 jumper board.
Hopefully this provides what you need.
I'll leave them in a Dropbox folder for a week or so and then delete.
73,
Tom, AG9X
On Mon, Mar 13, 2023 at 11:49?AM JP Nery via groups.io <jpnery=
[email protected]> wrote:
Hi Folks,
Can anyone here write back and tell me the height of TR7 boards. I am
building sets of extender boards and need that dimension.
Also, if there are technicians here willing to test my extender sets,
please write back.
Tu & 73
John WA1ESO@...
401-624-4576
_._,_._,_
|
The one you really want is the "Jumper" board. It is by far the one I have used the most. It allows you to do tests on the radio without the DR7 installed. I rarely use any of the other extenders. Here is what the original Drake extenders look like: 73 -Jim NU0C On Mon, 13 Mar 2023 09:49:17 -0700 "JP Nery via groups.io" <jpnery@...> wrote: Hi Folks,
Can anyone here write back and tell me the height of TR7 boards.? I am building sets of extender boards and need that dimension.
Also, if there are technicians here willing to test my extender sets, please write back.
Tu & 73
John WA1ESO@...
401-624-4576
|
Re: What are the differances between the T4X and the T4XB
The PLATE meter also went from 400 to 500 mA full scale. Mic jack moved to the side.?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent from Proton Mail for iOS
On Mon, Mar 13, 2023 at 15:21, Rob Sherwood < rob@...> wrote: The major change was 8-pole TX filters instead of 4 pole. Then the T-4XC came out with "locked transceive" which had never existed previously. (Meaning there was not an RX vs. TX frequency error.) Rob, NC0B
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Richard Loken
Sent: Monday, March 13, 2023 12:19 PM
To: drake mail list
Subject: [DRAKE-RADIO] What are the differances between the T4X and the T4XB
The subject says it all: what did Drake change when they went from the
T4X and the T4XB? Was there a T4XA?
--
Richard Loken VE6BSV : "...underneath those tuques we wear,
Athabasca, Alberta Canada : our heads are naked!"
** rlloken@... ** : - Arthur Black
|
John,
I scanned a full set of original Drake extender boards as well as the DR-7 jumper board and a NB-7 jumper board.
Hopefully this provides what you need.
I'll leave them in a Dropbox folder for a week or so and then delete.
73, Tom, AG9X
Hi Folks,
Can anyone here write back and tell me the height of TR7 boards.? I am building sets of extender boards and need that dimension.
Also, if there are technicians here willing to test my extender sets, please write back.
Tu & 73
John WA1ESO@...
401-624-4576
_._,_._,_
|
Re: What are the differances between the T4X and the T4XB
On Mon, 13 Mar 2023, Lyndon Nerenberg (VE7TFX/VE6BBM) wrote: Gee, Richard, you could just box it up and send it back to me :-) I could do that but where would you put yet more radios? And the postage would knock another hole in your bank account. -- Richard Loken VE6BSV : "...underneath those tuques we wear, Athabasca, Alberta Canada : our heads are naked!" ** rlloken@... ** : - Arthur Black
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Re: DRAKE MN-2000 Ceramic wafer replacement/repair for Antenna Selector Switch help?
Here is link to pictures of the switch.? Wish they were better
pictures but that is all I have.? Ignore the paint finish pictures
at end.? I also refinished the cabinet.
Paul K0UYA
On 3/13/2023 4:06 PM, Peter A wrote:
Peter et al
I got the message(s) and I can help with that
switch replacement.? I was able to find an
inexpensive switch on ebay and "adapt" it to repair
the MN200 to "better than new".? The switch is
basically Soviet or Eastern Europe manufacture,
rugged, fits same space.? The only mod to the switch
is remove extra wafers from the back end and mount
it backwards in the tuner.? You can cut the switch
shaft short or leave it to protrude through the rear
panel.? A shaft coupling is used to mate the Drake
selector knob shaft extension to the new switch.?
Both the switch shaft and the selector shaft are
flatted and do not line up.? To ensure a sturdy
coupling you need to drill a new set screw hole in
the coupling to compensate for the alignment.? That
makes the set screws land on the flatted shafts.? I
made my own coupling from a short piece of 1/2" dia
aluminum rod.? EASY and it stays indexed even if the
screws are loose.
The Drake switch had back to back contacts on a
single wafer.? The new switch I used two wafers
wired together..
If the switch can't be found on ebay I have an
extra.
I 'll find the picture file and hopefully someone
can put them on the reflector archives.
IT IS A NICE REPAIR---NO KLUDGE.
Paul K0UYA
Paul, that sounds fantastic.? Anyhow, I like a
challenge so wouldn't want an exact replacement
anyway.? HIHI.? If you remember the ebay seller
that'd be helpful also.
appreciate everything.
Thank you Paul.
Peter
VE9KX
|
|
Re: What are the differances between the T4X and the T4XB
Lyndon Nerenberg (VE7TFX/VE6BBM)
Richard Loken writes: I also have a C line but that is a waste since I have all the skill and
ambition of the Saksatchewan farmers I knew as a schoolboy who parked their
Galaxy Vs on 3785kHz and chatted to their friends down the road every night. Gee, Richard, you could just box it up and send it back to me :-) --lyndon
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I have experienced dirty pushbuttons and small electrolytics that failed miserably in my RV75. They were Capar branded. If you have those replace them. 73 -Jim NU0C On Mon, 13 Mar 2023 10:23:47 -0700 "Rick Boswell" <frboswell@...> wrote: I began checking out a new-to-me RV75 this AM and am seeing some issues I dont yet understand. These are:
1. While the RV75 seems to be working in a basic fashion, the frequency displayed on the TR7 varies by as much a 2 KHz over time, even with an extneded warmup and without touching the tuning knob.
2. It is nearly impossible to set the frequenciny to the desired 100 Hz increment; very small movements of the tuning knob produce a few hundred Hz change in the displayed frequency.
3. The "Fixed Frequency" feature does not display the programmed frequency. Programming is a bit convoluted but I have verified several times that the switch settings are as described in the manual.
This is a a late serial number RV75 in very nice overall condition and was serviced by Ron Baker in 2015; his invoice shows only minimal work needed. My TR7 works as expected with an RV7 in place of the RV75.
So, wondering how best to proceed. Problems may be pilot error due to lack of familiarity, but if so, not clear what the pilot is doing wrong. I have a manual? but am reluctant to dive into troubleshooting without a better understanding as to what might cause these symptoms. Any guidance appreciated.
Rick
K8EZB
|
Re: DRAKE MN-2000 Ceramic wafer replacement/repair for Antenna Selector Switch help?
On Mon, Mar 13, 2023 at 06:06 PM, John K5MO wrote:
While it's not easy to determine the exact size of that switch wafer in the photos, I have successfully repaired similar elements by transplanting contacts from an avaialable? switch after carefully removing the small rivet. I believe I found those miniature rivets somewhere or used #0 sized hardware. The job was an an AL80 and the repair? was not as difficult as it initially looked.
John? K5MO................................
I was prepared to do just that John, meaning drill the rivets, replace contacts from another wafer but I think the actual contact plates themselves are a bit rough.
Peter VE9KX
|
Re: DRAKE MN-2000 Ceramic wafer replacement/repair for Antenna Selector Switch help?
Peter et al
I got the message(s) and I can help with that switch replacement.? I was able to find an inexpensive switch on ebay and "adapt" it to repair the MN200 to "better than new".? The switch is basically Soviet or Eastern Europe manufacture, rugged, fits same space.? The only mod to the switch is remove extra wafers from the back end and mount it backwards in the tuner.? You can cut the switch shaft short or leave it to protrude through the rear panel.? A shaft coupling is used to mate the Drake selector knob shaft extension to the new switch.? Both the switch shaft and the selector shaft are flatted and do not line up.? To ensure a sturdy coupling you need to drill a new set screw hole in the coupling to compensate for the alignment.? That makes the set screws land on the flatted shafts.? I made my own coupling from a short piece of 1/2" dia aluminum rod.? EASY and it stays indexed even if the screws are loose.
The Drake switch had back to back contacts on a single wafer.? The new switch I used two wafers wired together..
If the switch can't be found on ebay I have an extra.
I 'll find the picture file and hopefully someone can put them on the reflector archives.
IT IS A NICE REPAIR---NO KLUDGE.
Paul K0UYA
Paul, that sounds fantastic.? Anyhow, I like a challenge so wouldn't want an exact replacement anyway.? HIHI.? If you remember the ebay seller that'd be helpful also.
appreciate everything.
Thank you Paul.
Peter
VE9KX
|
|
Re: DRAKE MN-2000 Ceramic wafer replacement/repair for Antenna Selector Switch help?
While it's not easy to determine the exact size of that switch wafer in the photos, I have successfully repaired similar elements by transplanting contacts from an avaialable? switch after carefully removing the small rivet. I believe I found those miniature rivets somewhere or used #0 sized hardware. The job was an an AL80 and the repair? was not as difficult as it initially looked.
John? K5MO
On Mon, Mar 13, 2023 at 4:56?PM Paul Kraemer < elespe@...> wrote:
Peter et al
I got the message(s) and I can help with that switch
replacement.? I was able to find an inexpensive switch on ebay and
"adapt" it to repair the MN200 to "better than new".? The switch
is basically Soviet or Eastern Europe manufacture, rugged, fits
same space.? The only mod to the switch is remove extra wafers
from the back end and mount it backwards in the tuner.? You can
cut the switch shaft short or leave it to protrude through the
rear panel.? A shaft coupling is used to mate the Drake selector
knob shaft extension to the new switch.? Both the switch shaft and
the selector shaft are flatted and do not line up.? To ensure a
sturdy coupling you need to drill a new set screw hole in the
coupling to compensate for the alignment.? That makes the set
screws land on the flatted shafts.? I made my own coupling from a
short piece of 1/2" dia aluminum rod.? EASY and it stays indexed
even if the screws are loose.
The Drake switch had back to back contacts on a single wafer.?
The new switch I used two wafers wired together..
If the switch can't be found on ebay I have an extra.
I 'll find the picture file and hopefully someone can put them on
the reflector archives.
IT IS A NICE REPAIR---NO KLUDGE.
Paul K0UYA
On 3/13/2023 10:16 AM, Peter A wrote:
[Edited Message Follows]
Hello to all.? It's been a minute since posting here but I keep up
to date on what's up just the same.? Always interesting and
informative.? This spring will be Delhi tower antenna erection,
and hopefully get some of my Drake stuff on the air!? Difficulty
deciding on a "multiband beam".? Either the Hy-gain TH-11DX or
Optibeam OB9-HD5.? Anyway I'll figure it out eventually I guess.?
Now to the point of this post.? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
? Wondering if anyone has an MN-2000?antenna switch?ceramic
wafer they want to part with"? Previous owner "hot switched" and
fried a few
contacts.? I've removed the wafer over the weekend.? I tried the
ebay seller "networkrw" and he was very hopeful he
could help, but it didn't pan out as he couldn't find one close
enough.
Contacted Ron Wb4hfn but he said he didn't have that part.? Any
ideas of where to source something suitable even with a little
modification?
I understand that a replacement was available from Russia but I
doubt that's not an option at this point.
I'd appreciate any info that may help.? I know about the direction
of "drilling out" the rivets and swapping contacts with another
wafer and using very small bolts to hold them in but is this the
only option available, and I'm not even sure the contact plates
would be good enough anyway?
I've looked at the older posts asking the same question but
they're limited.
Any ideas would be greatly appreciated.
73
Peter
VE9KX
|
Re: DRAKE MN-2000 Ceramic wafer replacement/repair for Antenna Selector Switch help?
Peter et al
I got the message(s) and I can help with that switch
replacement.? I was able to find an inexpensive switch on ebay and
"adapt" it to repair the MN200 to "better than new".? The switch
is basically Soviet or Eastern Europe manufacture, rugged, fits
same space.? The only mod to the switch is remove extra wafers
from the back end and mount it backwards in the tuner.? You can
cut the switch shaft short or leave it to protrude through the
rear panel.? A shaft coupling is used to mate the Drake selector
knob shaft extension to the new switch.? Both the switch shaft and
the selector shaft are flatted and do not line up.? To ensure a
sturdy coupling you need to drill a new set screw hole in the
coupling to compensate for the alignment.? That makes the set
screws land on the flatted shafts.? I made my own coupling from a
short piece of 1/2" dia aluminum rod.? EASY and it stays indexed
even if the screws are loose.
The Drake switch had back to back contacts on a single wafer.?
The new switch I used two wafers wired together..
If the switch can't be found on ebay I have an extra.
I 'll find the picture file and hopefully someone can put them on
the reflector archives.
IT IS A NICE REPAIR---NO KLUDGE.
Paul K0UYA
On 3/13/2023 10:16 AM, Peter A wrote:
toggle quoted message
Show quoted text
[Edited Message Follows]
Hello to all.? It's been a minute since posting here but I keep up
to date on what's up just the same.? Always interesting and
informative.? This spring will be Delhi tower antenna erection,
and hopefully get some of my Drake stuff on the air!? Difficulty
deciding on a "multiband beam".? Either the Hy-gain TH-11DX or
Optibeam OB9-HD5.? Anyway I'll figure it out eventually I guess.?
Now to the point of this post.? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
? Wondering if anyone has an MN-2000?antenna switch?ceramic
wafer they want to part with"? Previous owner "hot switched" and
fried a few
contacts.? I've removed the wafer over the weekend.? I tried the
ebay seller "networkrw" and he was very hopeful he
could help, but it didn't pan out as he couldn't find one close
enough.
Contacted Ron Wb4hfn but he said he didn't have that part.? Any
ideas of where to source something suitable even with a little
modification?
I understand that a replacement was available from Russia but I
doubt that's not an option at this point.
I'd appreciate any info that may help.? I know about the direction
of "drilling out" the rivets and swapping contacts with another
wafer and using very small bolts to hold them in but is this the
only option available, and I'm not even sure the contact plates
would be good enough anyway?
I've looked at the older posts asking the same question but
they're limited.
Any ideas would be greatly appreciated.
73
Peter
VE9KX
|
Re: DRAKE MN-2000 Ceramic wafer replacement/repair for Antenna Selector Switch help?
I see now that both sides of the switch are tied together (presumably to enhance the power capability of the switch) which may complicate finding a replacement.? I think someone mentioned using two wafers to mimic that but, again, finding one replacement may be hard enough to do and even harder to find two.? :-(
Thanks,
Barry - N4BUQ
From: "Peter A" <christinepeterarsenault@...>
To: "DRAKE-RADIO" <[email protected]>
Sent: Monday, March 13, 2023 3:20:06 PM
Subject: Re: [DRAKE-RADIO] DRAKE MN-2000 Ceramic wafer replacement/repair for Antenna Selector Switch help?
On Mon, Mar 13, 2023 at 04:53 PM, n4buq wrote:
Isn't that just a ceramic Centralab wafer?? Those can often be found as individual wafers on eBay, etc., with the correct shaft hole and contacts/wiper configuration.? The trick is getting the proper stud spacing.? I had to replace a few of those in a VTVM last year and it took a while to find a proper replacements but I finally found them.
?
Good luck with it.
I do believe it is one of their wafers but difficult to find the exact.
I was in touch with an Ebay seller who sells this type of thing and in all his inventory he had no match.
Thanks for the input Barry.
73
Peter
VE9KX
?
?
Thanks,
Barry - N4BUQ
?
From: "Peter A" <christinepeterarsenault@...>
To: "DRAKE-RADIO" <[email protected]>
Sent: Monday, March 13, 2023 10:16:32 AM
Subject: [DRAKE-RADIO] DRAKE MN-2000 Ceramic wafer replacement/repair for Antenna Selector Switch help?
[Edited Message Follows]
Hello to all.? It's been a minute since posting here but I keep up to date on what's up just the same.? Always interesting and informative.? This spring will be Delhi tower antenna erection, and hopefully get some of my Drake stuff on the air!? Difficulty deciding on a "multiband beam".? Either the Hy-gain TH-11DX or Optibeam OB9-HD5.? Anyway I'll figure it out eventually I guess.? Now to the point of this post.? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Wondering if anyone has an MN-2000?antenna switch?ceramic wafer they want to part with"? Previous owner "hot switched" and fried a few
contacts.? I've removed the wafer over the weekend.? I tried the ebay seller "networkrw" and he was very hopeful he could help, but it didn't pan out as he couldn't find one close enough.
Contacted Ron Wb4hfn but he said he didn't have that part.? Any ideas of where to source something suitable even with a little modification?
I understand that a replacement was available from Russia but I doubt that's not an option at this point.
I'd appreciate any info that may help.? I know about the direction of "drilling out" the rivets and swapping contacts with another wafer and using very small bolts to hold them in but is this the only option available, and I'm not even sure the contact plates would be good enough anyway?
I've looked at the older posts asking the same question but they're limited.
Any ideas would be greatly appreciated.
73
Peter
VE9KX
|
Re: What are the differances between the T4X and the T4XB
On Mon, 13 Mar 2023, Rob Sherwood wrote: The major change was 8-pole TX filters instead of 4 pole. Then the T-4XC came out with "locked transceive" which had never existed previously. (Meaning there was not an RX vs. TX frequency error.) Rob, NC0B Well that is interesting. That explains why a casual glance at the photographs on eBay do not show any differences. I have a T4XB so, by your desription, it is the better bargain. I also have a C line but that is a waste since I have all the skill and ambition of the Saksatchewan farmers I knew as a schoolboy who parked their Galaxy Vs on 3785kHz and chatted to their friends down the road every night. -- Richard Loken VE6BSV : "...underneath those tuques we wear, Athabasca, Alberta Canada : our heads are naked!" ** rlloken@... ** : - Arthur Black
|
Jim Shorney