Re: Dumb question of the day.
Now that I'm back at my shack, I can attest that the 70 series meter that I have is the 77. It's in excellent shape and is still holding its calibration, as far as I can tell without having a traceable standard...
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with Proton Mail secure email.
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On Sunday, March 17th, 2024 at 4:44 PM, Jim Shorney <jimNU0C@...> wrote: The speed factor that I look at for DMMs is how quickly the beep reacts when doing continuity testing. The Flukes seem to be mostly pretty fast. Cheaper DMMs (yes I have some of those too) less so. We had quite a few 77s at my former workplace and they were acceptable.
73
-Jim
NU0C
On Sun, 17 Mar 2024 18:39:25 +0000
"Steve Wedge, W1ES/4 via groups.io" w1es@... wrote:
I have a Fluke 17B (Chinese-made and for foreign markets) that I bought new on eBay a few years ago. I found the delay in getting a stable reading to be something that really bugs me.
I have an old Fluke 77 or 73 that auto ranges that is still plenty fast enough. Of course these cost around $300 in ¡®83 and the newer one was $125 in 2020.
Yes, sometimes I¡¯ll set the 73 at manual ranging.
I bought it at a hamfest a couple years ago for $15.
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent from Proton Mail for iOS
On Sun, Mar 17, 2024 at 12:50, Ralph Mowery via groups.io <[ku4pt@...](mailto:On Sun, Mar 17, 2024 at 12:50, Ralph Mowery via groups.io <<a href=)> wrote:
I have two of the 8060A but have not used them in a while. Usually use the newer auto ranging ones . Could you send me the file about replacing the capacitors so I will have it if my 8060 fails I could try replacing them.
ralph ku4pt
On Sunday, March 17, 2024 at 11:37:39 AM EDT, Paul Christensen w9ac@... wrote:
The 8060A was quite an achievement for a 1980s DMM design. After graduating from college, I worked for RKO Radio in Chicago. We depended on it for a litany of precision audio measurements.
I¡¯m in the minority, but I prefer manual-ranging DMMs and its one reason I keep the 8060A and one that¡¯s NOS in the box. Even the fastest auto-ranging DMMs slow me down when working through a problem.
A while back, I did correspond with Dr. Taylor though EEVBlog. Searching though the same message board is a complete set of instructions for electrolytic cap replacement and a B.O.M. Today, many 8060A stability issues are a result of failed low WVDC caps. If anyone would like a copy, let me know.
The ultra-high Z tool you mentioned may have been the first implementation in a DMM. Nice for DC work, but of course, an isolating-tip probe is still needed for many Hi-Z RF measurements.
Paul, W9AC
--
73
-Jim
NU0C
|
Re: Dumb question of the day.
The speed factor that I look at for DMMs is how quickly the beep reacts when doing continuity testing. The Flukes seem to be mostly pretty fast. Cheaper DMMs (yes I have some of those too) less so. We had quite a few 77s at my former workplace and they were acceptable. 73 -Jim NU0C On Sun, 17 Mar 2024 18:39:25 +0000 "Steve Wedge, W1ES/4 via groups.io" <w1es@...> wrote: I have a Fluke 17B (Chinese-made and for foreign markets) that I bought new on eBay a few years ago. I found the delay in getting a stable reading to be something that really bugs me.
I have an old Fluke 77 or 73 that auto ranges that is still plenty fast enough. Of course these cost around $300 in ¡®83 and the newer one was $125 in 2020.
Yes, sometimes I¡¯ll set the 73 at manual ranging.
I bought it at a hamfest a couple years ago for $15.
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent from [Proton Mail]() for iOS
On Sun, Mar 17, 2024 at 12:50, Ralph Mowery via groups.io <[ku4pt@...](mailto:On Sun, Mar 17, 2024 at 12:50, Ralph Mowery via groups.io <<a href=)> wrote:
I have two of the 8060A but have not used them in a while. Usually use the newer auto ranging ones . Could you send me the file about replacing the capacitors so I will have it if my 8060 fails I could try replacing them.
ralph ku4pt
On Sunday, March 17, 2024 at 11:37:39 AM EDT, Paul Christensen <w9ac@...> wrote:
The 8060A was quite an achievement for a 1980s DMM design. After graduating from college, I worked for RKO Radio in Chicago. We depended on it for a litany of precision audio measurements.
I¡¯m in the minority, but I prefer manual-ranging DMMs and its one reason I keep the 8060A and one that¡¯s NOS in the box. Even the fastest auto-ranging DMMs slow me down when working through a problem.
A while back, I did correspond with Dr. Taylor though EEVBlog. Searching though the same message board is a complete set of instructions for electrolytic cap replacement and a B.O.M. Today, many 8060A stability issues are a result of failed low WVDC caps. If anyone would like a copy, let me know.
The ultra-high Z tool you mentioned may have been the first implementation in a DMM. Nice for DC work, but of course, an isolating-tip probe is still needed for many Hi-Z RF measurements.
Paul, W9AC
-- 73 -Jim NU0C
|
Re: Dumb question of the day.
I have a WV-98C also. Love that huge meter. The other one is I think a WV-97A which is the usual form factor for VTVMs of that type. It works too but doesn't get used as much as its big brother. 73 -Jim NU0C On Sun, 17 Mar 2024 14:34:32 -0400 "Paul Christensen" <w9ac@...> wrote: Nice find on the Fluke 289. Even on the used market they're quite expensive. RCA WV-98C is the go-to VTVM here.
Triplett made a really nice FET analog VOM, the model 603. It's roughly the same case size as a Simpson 260. They're scarce but well worth the search. It came standard from Triplett with a rugged 1M probe.
Paul, W9AC
-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Jim Shorney
Sent: Sunday, March 17, 2024 12:45 PM
To: [email protected]
Subject: Re: [DRAKE-RADIO] Dumb question of the day.
The 8050A from the same era is a nice bench meter. I love mine. If you get one with the battery option it is portable but then you have to deal with NiCad maintenance. I found a 289 dirt cheap at a flea. It turned out it had the known problem of where an LED in the probe sense circuit fell off the board and was rattling around inside. Easy fix. It is an interesting meter. These two are my go-to meters. My two RCA VTVMs are nearby for use when needed.
n.b. Most auto ranging meters can be set to manual.
73
-Jim
NU0C
On Sun, 17 Mar 2024 11:37:13 -0400
"Paul Christensen" <w9ac@...> wrote:
The 8060A was quite an achievement for a 1980s DMM design. After graduating from college, I worked for RKO Radio in Chicago. We depended on it for a litany of precision audio measurements.
I¡¯m in the minority, but I prefer manual-ranging DMMs and its one reason I keep the 8060A and one that¡¯s NOS in the box. Even the fastest auto-ranging DMMs slow me down when working through a problem.
A while back, I did correspond with Dr. Taylor though EEVBlog. Searching though the same message board is a complete set of instructions for electrolytic cap replacement and a B.O.M. Today, many 8060A stability issues are a result of failed low WVDC caps. If anyone would like a copy, let me know.
The ultra-high Z tool you mentioned may have been the first implementation in a DMM. Nice for DC work, but of course, an isolating-tip probe is still needed for many Hi-Z RF measurements.
Paul, W9AC
From: [email protected] <[email protected]> On Behalf Of Robert N0GGO
Sent: Sunday, March 17, 2024 7:37 AM
To: [email protected]
Subject: Re: [DRAKE-RADIO] Dumb question of the day.
Paul, you may already know this, but the 8060A has a special high impedance mode for DC voltage measurements. However, it only works in 2V and 200mv ranges. To put it in high impedance mode, you select either 2V or 200mv range and leave all the other switches out. If I remember correctly it offers several hundred Megohms of impedance. With a shunt you could use 100:1 to cover a more useful voltage range. May not offer much in the way of resolution though.
I love that meter. I was issued a brand new one in my Eastman Kodak toolkit in 1982 when I went to work for them as a service rep in 1982. When I saw an 8060A on eBay a few years ago I snagged it. It has become my go to meter around the shack. This is at least partly for nostalgic reasons, but it is also a fine meter. The guy who designed it used to hangout on EEVblog I think his name is Dr. Taylor. That is where I learned about the High impedance mode. It is in the manual, but you know how that goes.
73,
Bob N0GGO
-- 73 -Jim NU0C
|
Re: Dumb question of the day.
I like the 8050A a lot too.? I also like the 8842A.? Wish it had the AC
option.? Seems like I've read where someone made a clone of the AC
option board.
For tube gear, my go to meter is the HP-410B.
73
Stan
KM4HQE
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Show quoted text
On 3/17/24 11:44, Jim Shorney wrote: The 8050A from the same era is a nice bench meter. I love mine. If you get one with the battery option it is portable but then you have to deal with NiCad maintenance. I found a 289 dirt cheap at a flea. It turned out it had the known problem of where an LED in the probe sense circuit fell off the board and was rattling around inside. Easy fix. It is an interesting meter. These two are my go-to meters. My two RCA VTVMs are nearby for use when needed.
n.b. Most auto ranging meters can be set to manual.
73
-Jim
NU0C
On Sun, 17 Mar 2024 11:37:13 -0400
"Paul Christensen" <w9ac@...> wrote:
The 8060A was quite an achievement for a 1980s DMM design. After graduating from college, I worked for RKO Radio in Chicago. We depended on it for a litany of precision audio measurements.
I¡¯m in the minority, but I prefer manual-ranging DMMs and its one reason I keep the 8060A and one that¡¯s NOS in the box. Even the fastest auto-ranging DMMs slow me down when working through a problem.
A while back, I did correspond with Dr. Taylor though EEVBlog. Searching though the same message board is a complete set of instructions for electrolytic cap replacement and a B.O.M. Today, many 8060A stability issues are a result of failed low WVDC caps. If anyone would like a copy, let me know.
The ultra-high Z tool you mentioned may have been the first implementation in a DMM. Nice for DC work, but of course, an isolating-tip probe is still needed for many Hi-Z RF measurements.
Paul, W9AC
From: [email protected] <[email protected]> On Behalf Of Robert N0GGO
Sent: Sunday, March 17, 2024 7:37 AM
To: [email protected]
Subject: Re: [DRAKE-RADIO] Dumb question of the day.
Paul, you may already know this, but the 8060A has a special high impedance mode for DC voltage measurements. However, it only works in 2V and 200mv ranges. To put it in high impedance mode, you select either 2V or 200mv range and leave all the other switches out. If I remember correctly it offers several hundred Megohms of impedance. With a shunt you could use 100:1 to cover a more useful voltage range. May not offer much in the way of resolution though.
I love that meter. I was issued a brand new one in my Eastman Kodak toolkit in 1982 when I went to work for them as a service rep in 1982. When I saw an 8060A on eBay a few years ago I snagged it. It has become my go to meter around the shack. This is at least partly for nostalgic reasons, but it is also a fine meter. The guy who designed it used to hangout on EEVblog I think his name is Dr. Taylor. That is where I learned about the High impedance mode. It is in the manual, but you know how that goes.
73,
Bob N0GGO
|
Re: Soft Rubber Eqp't Feet
Okay, apparently a lot of people are unfamiliar with the undercarriage
on Vibroplex keys :-) See the 1st picture attached. From L-R those
are the bottom sides of an Iambic, a Vibrokeyer, and a standard
bug. There's a lot of stuff going on under there. Double sided
tape, gluing on rubber sheets, etc., aren't an option. (And though
it probaly won't work here, either, "museum putty" sounds very cool
and deserves further exploration. It could be useful for keeping
things like watt meters from wandering about.)
At the bottom of the 1st pic is the butt side of the road warrior key
I put together. Those stick-on bumpers stick like glue! If I could
find a taller version of those, I could just remove the feet from
all the keys and replace them with the bumpers.
I did come up with a workaround for the main offender, though. (See
2nd picture attached.) I found some small stick-on bumpers I had
forgotten about. These keep the key nicely stuck to the desk, but
they elevate it to where the finger pieces are higher up than I
like. It will work for now, but it's not a long term solution.
Anyway, still searching ... :-)
--lyndon
|
Re: Dumb question of the day.
I have a Fluke 17B (Chinese-made and for foreign markets) that I bought new on eBay a few years ago. I found the delay in getting a stable reading to be something that really bugs me.?
I have an old Fluke 77 or 73 that auto ranges that is still plenty fast enough. Of course these cost around $300 in ¡®83 and the newer one was $125 in 2020.?
Yes, sometimes I¡¯ll set the 73 at manual ranging.?
I bought it at a hamfest a couple years ago for $15.?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Sun, Mar 17, 2024 at 12:50, Ralph Mowery via groups.io < ku4pt@...> wrote:
I have two of the 8060A but have not used them in a while.? Usually use the newer auto ranging ones .? Could you send me the file about replacing the capacitors so I will have it if my 8060 fails I could try replacing them.
ralph ku4pt
On Sunday, March 17, 2024 at 11:37:39 AM EDT, Paul Christensen <w9ac@...> wrote:
The 8060A was quite an achievement for a 1980s DMM design.? After graduating from college, I worked for RKO Radio in Chicago.? We depended on it for a litany of precision audio measurements.? ? I¡¯m in the minority, but I prefer manual-ranging DMMs and its one reason I keep the 8060A and one that¡¯s NOS in the box. ?Even the fastest auto-ranging DMMs slow me down when working through a problem. ? A while back, I did correspond with Dr. Taylor though EEVBlog. Searching though the same message board is a complete set of instructions for electrolytic cap replacement and a B.O.M.? Today, many 8060A stability issues are a result of failed low WVDC caps.? If anyone would like a copy, let me know. ? The ultra-high Z tool you mentioned may have been the first implementation in a DMM.? Nice for DC work, but of course, an isolating-tip probe is still needed for many Hi-Z RF measurements. ? Paul, W9AC? ??
|
Re: Dumb question of the day.
Nice find on the Fluke 289. Even on the used market they're quite expensive. RCA WV-98C is the go-to VTVM here.
Triplett made a really nice FET analog VOM, the model 603. It's roughly the same case size as a Simpson 260. They're scarce but well worth the search. It came standard from Triplett with a rugged 1M probe.
Paul, W9AC
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Show quoted text
-----Original Message----- From: [email protected] < [email protected]> On Behalf Of Jim Shorney Sent: Sunday, March 17, 2024 12:45 PM To: [email protected]Subject: Re: [DRAKE-RADIO] Dumb question of the day. The 8050A from the same era is a nice bench meter. I love mine. If you get one with the battery option it is portable but then you have to deal with NiCad maintenance. I found a 289 dirt cheap at a flea. It turned out it had the known problem of where an LED in the probe sense circuit fell off the board and was rattling around inside. Easy fix. It is an interesting meter. These two are my go-to meters. My two RCA VTVMs are nearby for use when needed. n.b. Most auto ranging meters can be set to manual. 73 -Jim NU0C On Sun, 17 Mar 2024 11:37:13 -0400 "Paul Christensen" <w9ac@...> wrote: The 8060A was quite an achievement for a 1980s DMM design. After graduating from college, I worked for RKO Radio in Chicago. We depended on it for a litany of precision audio measurements.
I¡¯m in the minority, but I prefer manual-ranging DMMs and its one reason I keep the 8060A and one that¡¯s NOS in the box. Even the fastest auto-ranging DMMs slow me down when working through a problem.
A while back, I did correspond with Dr. Taylor though EEVBlog. Searching though the same message board is a complete set of instructions for electrolytic cap replacement and a B.O.M. Today, many 8060A stability issues are a result of failed low WVDC caps. If anyone would like a copy, let me know.
The ultra-high Z tool you mentioned may have been the first implementation in a DMM. Nice for DC work, but of course, an isolating-tip probe is still needed for many Hi-Z RF measurements.
Paul, W9AC
From: [email protected] <[email protected]> On Behalf Of Robert N0GGO
Sent: Sunday, March 17, 2024 7:37 AM
To: [email protected]
Subject: Re: [DRAKE-RADIO] Dumb question of the day.
Paul, you may already know this, but the 8060A has a special high impedance mode for DC voltage measurements. However, it only works in 2V and 200mv ranges. To put it in high impedance mode, you select either 2V or 200mv range and leave all the other switches out. If I remember correctly it offers several hundred Megohms of impedance. With a shunt you could use 100:1 to cover a more useful voltage range. May not offer much in the way of resolution though.
I love that meter. I was issued a brand new one in my Eastman Kodak toolkit in 1982 when I went to work for them as a service rep in 1982. When I saw an 8060A on eBay a few years ago I snagged it. It has become my go to meter around the shack. This is at least partly for nostalgic reasons, but it is also a fine meter. The guy who designed it used to hangout on EEVblog I think his name is Dr. Taylor. That is where I learned about the High impedance mode. It is in the manual, but you know how that goes.
73,
Bob N0GGO
|
Drake AA-10 is sold
Gary
W0DVN
|
Re: Dumb question of the day.
Ralph, ? Sent to your QRZ e-mail address. ? Paul, W9AC ?
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Show quoted text
From: [email protected] <[email protected]> On Behalf Of Ralph Mowery via groups.io
Sent: Sunday, March 17, 2024 12:51 PM
To: [email protected]
Subject: Re: [DRAKE-RADIO] Dumb question of the day.? I have two of the 8060A but have not used them in a while.? Usually use the newer auto ranging ones .? Could you send me the file about replacing the capacitors so I will have it if my 8060 fails I could try replacing them. On Sunday, March 17, 2024 at 11:37:39 AM EDT, Paul Christensen <w9ac@...> wrote: The 8060A was quite an achievement for a 1980s DMM design.? After graduating from college, I worked for RKO Radio in Chicago.? We depended on it for a litany of precision audio measurements.? ? I¡¯m in the minority, but I prefer manual-ranging DMMs and its one reason I keep the 8060A and one that¡¯s NOS in the box. ?Even the fastest auto-ranging DMMs slow me down when working through a problem. ? A while back, I did correspond with Dr. Taylor though EEVBlog. Searching though the same message board is a complete set of instructions for electrolytic cap replacement and a B.O.M.? Today, many 8060A stability issues are a result of failed low WVDC caps.? If anyone would like a copy, let me know. ? The ultra-high Z tool you mentioned may have been the first implementation in a DMM.? Nice for DC work, but of course, an isolating-tip probe is still needed for many Hi-Z RF measurements. ? Paul, W9AC? ??
|
I assumed that you are getting relay closure, if you're getting idle current.? A bad 12AX7 can stop things, though.? If it's running really abnormally hot, look around that circuit for shorted components.
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Sunday, March 17th, 2024 at 8:26 AM, Don Woodward - KD4APP <dbwoodw@...> wrote:
I will clean all the tube pins and check the voltages and resistances in the tables.
I also noticed the 12AX7A V17 is extremely hot, so I'll check it again - it serves as audio amp and a TX function I see.
73's
Don W
KD4APP?
73's
Don W
Hmmm.?
Did you already say that you¡¯ve cleaned the tube
Pins and switches?
Chances are that it¡¯s not a filter, because you¡¯re getting nothing in either sideband, and I was looking to see if one of them wasn¡¯t working.?
You¡¯re going to need at least a meter and check against the chart in the manual.?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Sat, Mar 16, 2024 at 20:38, Don Woodward - KD4APP < dbwoodw@...> wrote:
I connected my D104 from my Collins KWM-2 and no modulation in either LSB or USB. ?That mic works on the Collins fine. ?I did notice .15ma when I key the mic compared to .1ma with X-CW but no modulation.
Which filters do you suspect? ?I have another TR-3 I was hoping to get working after this one as it belonged to a SK friend, but I might be ok to scavenge something from it as the chassis is in really bad shape on it.
73
Don W
KD4APP?
Any modulation in SSB, with switch in LSB and USB? ?I suspect one of the filters.?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Sat, Mar 16, 2024 at 18:45, Don Woodward - KD4APP < dbwoodw@...> wrote:
Yes, that is closed with no key present and open with one.
73's
Don W
KD4APP?
Can you measure that the contacts in the key jack used to close the key contacts when a key is not present are actually making contact?
John K5MO
On Sat, Mar 16, 2024 at 4:24?PM Don Woodward - KD4APP < dbwoodw@...> wrote:
Yes sir that¡¯s all correct - using the CW and X mode.? No key present.
Any other possible reason?
The radios history is unknown.
73
Don W
KD4APP?
Be sure that the SIDEBAND switch is on "X-CW".? If you're tuning in CW mode, you either need the KEY jack to have nothing plugged in or close the key contacts.? Likewise, if you transmit on SSB and have
a key in the KEY jack, you need to close the key contacts.
73,
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Saturday, March 16th, 2024 at 1:28 PM, Don Woodward - KD4APP < dbwoodw@...> wrote:
I went through the tune up procedure and everything looked good until I got to the last step and the plate current never goes above .1 on the plate meter.
I have set the bias with the PS per the manual.
I checked continuity on the relay (both TX/RX) - it was good on both tests and I see it engage on transmit.
The system receives quite well - especially after tune up.
Looking at the bottom it looks like all the electrolytic capacitors were replaced.? The large electrolytic multi section was replaced by three capacitors under the chassis.
All tubes test good.
At this point I am stumped - unable to get any power out of it.
One other odd thing - if you turn the TX gain up past about three ticks while receiving you can hear an oscillation tone.
I have lots of test gear and have restored several other tube transceivers, receivers and transmitters so this is not my first "radio" LOL.
TIA and 73's
Don W.
KD4APP
?
|
Re: Dumb question of the day.
I have two of the 8060A but have not used them in a while.? Usually use the newer auto ranging ones .? Could you send me the file about replacing the capacitors so I will have it if my 8060 fails I could try replacing them.
ralph ku4pt
On Sunday, March 17, 2024 at 11:37:39 AM EDT, Paul Christensen <w9ac@...> wrote:
The 8060A was quite an achievement for a 1980s DMM design.? After graduating from college, I worked for RKO Radio in Chicago.? We depended on it for a litany of precision audio measurements.? ? I¡¯m in the minority, but I prefer manual-ranging DMMs and its one reason I keep the 8060A and one that¡¯s NOS in the box. ?Even the fastest auto-ranging DMMs slow me down when working through a problem. ? A while back, I did correspond with Dr. Taylor though EEVBlog. Searching though the same message board is a complete set of instructions for electrolytic cap replacement and a B.O.M.? Today, many 8060A stability issues are a result of failed low WVDC caps.? If anyone would like a copy, let me know. ? The ultra-high Z tool you mentioned may have been the first implementation in a DMM.? Nice for DC work, but of course, an isolating-tip probe is still needed for many Hi-Z RF measurements. ? Paul, W9AC? ??_._,_._,_
|
Re: Dumb question of the day.
The 8050A from the same era is a nice bench meter. I love mine. If you get one with the battery option it is portable but then you have to deal with NiCad maintenance. I found a 289 dirt cheap at a flea. It turned out it had the known problem of where an LED in the probe sense circuit fell off the board and was rattling around inside. Easy fix. It is an interesting meter. These two are my go-to meters. My two RCA VTVMs are nearby for use when needed. n.b. Most auto ranging meters can be set to manual. 73 -Jim NU0C On Sun, 17 Mar 2024 11:37:13 -0400 "Paul Christensen" <w9ac@...> wrote: The 8060A was quite an achievement for a 1980s DMM design. After graduating from college, I worked for RKO Radio in Chicago. We depended on it for a litany of precision audio measurements.
I¡¯m in the minority, but I prefer manual-ranging DMMs and its one reason I keep the 8060A and one that¡¯s NOS in the box. Even the fastest auto-ranging DMMs slow me down when working through a problem.
A while back, I did correspond with Dr. Taylor though EEVBlog. Searching though the same message board is a complete set of instructions for electrolytic cap replacement and a B.O.M. Today, many 8060A stability issues are a result of failed low WVDC caps. If anyone would like a copy, let me know.
The ultra-high Z tool you mentioned may have been the first implementation in a DMM. Nice for DC work, but of course, an isolating-tip probe is still needed for many Hi-Z RF measurements.
Paul, W9AC
From: [email protected] <[email protected]> On Behalf Of Robert N0GGO
Sent: Sunday, March 17, 2024 7:37 AM
To: [email protected]
Subject: Re: [DRAKE-RADIO] Dumb question of the day.
Paul, you may already know this, but the 8060A has a special high impedance mode for DC voltage measurements. However, it only works in 2V and 200mv ranges. To put it in high impedance mode, you select either 2V or 200mv range and leave all the other switches out. If I remember correctly it offers several hundred Megohms of impedance. With a shunt you could use 100:1 to cover a more useful voltage range. May not offer much in the way of resolution though.
I love that meter. I was issued a brand new one in my Eastman Kodak toolkit in 1982 when I went to work for them as a service rep in 1982. When I saw an 8060A on eBay a few years ago I snagged it. It has become my go to meter around the shack. This is at least partly for nostalgic reasons, but it is also a fine meter. The guy who designed it used to hangout on EEVblog I think his name is Dr. Taylor. That is where I learned about the High impedance mode. It is in the manual, but you know how that goes.
73,
Bob N0GGO
|
Re: Dumb question of the day.
The 8060A was quite an achievement for a 1980s DMM design.? After graduating from college, I worked for RKO Radio in Chicago.? We depended on it for a litany of precision audio measurements.? ? I¡¯m in the minority, but I prefer manual-ranging DMMs and its one reason I keep the 8060A and one that¡¯s NOS in the box. ?Even the fastest auto-ranging DMMs slow me down when working through a problem. ? A while back, I did correspond with Dr. Taylor though EEVBlog. Searching though the same message board is a complete set of instructions for electrolytic cap replacement and a B.O.M.? Today, many 8060A stability issues are a result of failed low WVDC caps.? If anyone would like a copy, let me know. ? The ultra-high Z tool you mentioned may have been the first implementation in a DMM.? Nice for DC work, but of course, an isolating-tip probe is still needed for many Hi-Z RF measurements. ? Paul, W9AC? ? ?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]> On Behalf Of Robert N0GGO
Sent: Sunday, March 17, 2024 7:37 AM
To: [email protected]
Subject: Re: [DRAKE-RADIO] Dumb question of the day.? Paul, you may already know this, but the 8060A has a special high impedance mode for DC voltage measurements. However, it only works in 2V and 200mv ranges. To put it in high impedance mode, you select either 2V or 200mv range and leave all the other switches out. If I remember correctly it offers several hundred Megohms of impedance. With a shunt you could use 100:1 to cover a more useful voltage range. May not offer much in the way of resolution though.
I love that meter. I was issued a brand new one in my Eastman Kodak toolkit in 1982 when I went to work for them as a service rep in 1982. When I saw an 8060A on eBay a few years ago I snagged it. It has become my go to meter around the shack. This is at least partly for nostalgic reasons, but it is also a fine meter. The guy who designed it used to hangout on EEVblog I think his name is Dr. Taylor. That is where I learned about the High impedance mode. It is in the manual, but you know how that goes.
73,
Bob ? N0GGO
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Re: Soft Rubber Eqp't Feet
On Sun, 17 Mar 2024 09:01:15 -0600, you wrote: I was hoping to hear from somebody
who had already travelled this road and had found something
extremely grippy. "Museum putty" A pea-sized ball under each foot, everything firmly pressed down where you want it. My Vibroplex paddle (contacts wired together as a cootie key) stays put despite a rather ham-handed..... er...Ham! -- Gary Woods O- K2AHC
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Re: Soft Rubber Eqp't Feet
Use double sided tape to keep the keyer in place.
Doug
Free Climbing - The ultimate test of strength and endurance
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Lyndon VE7TFX Sent: March 16, 2024 10:09 PM To: [email protected]; Glenn, OZ1HFT Subject: Re: [DRAKE-RADIO] Soft Rubber Eqp't Feet Glenn, thanks for the pointer. But that still leaves me in my current conundrum. I can't tell if they will work just by looking at a web page. I was hoping to hear from somebody who had already travelled this road and had found something extremely grippy. The search continues ... --lyndon
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I will clean all the tube pins and check the voltages and resistances in the tables.
I also noticed the 12AX7A V17 is extremely hot, so I'll check it again - it serves as audio amp and a TX function I see.
73's
Don W
KD4APP?
73's
Don W
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Hmmm.?
Did you already say that you¡¯ve cleaned the tube
Pins and switches?
Chances are that it¡¯s not a filter, because you¡¯re getting nothing in either sideband, and I was looking to see if one of them wasn¡¯t working.?
You¡¯re going to need at least a meter and check against the chart in the manual.?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Sat, Mar 16, 2024 at 20:38, Don Woodward - KD4APP < dbwoodw@...> wrote:
I connected my D104 from my Collins KWM-2 and no modulation in either LSB or USB. ?That mic works on the Collins fine. ?I did notice .15ma when I key the mic compared to .1ma with X-CW but no modulation.
Which filters do you suspect? ?I have another TR-3 I was hoping to get working after this one as it belonged to a SK friend, but I might be ok to scavenge something from it as the chassis is in really bad shape on it.
73
Don W
KD4APP?
Any modulation in SSB, with switch in LSB and USB? ?I suspect one of the filters.?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Sat, Mar 16, 2024 at 18:45, Don Woodward - KD4APP < dbwoodw@...> wrote:
Yes, that is closed with no key present and open with one.
73's
Don W
KD4APP?
Can you measure that the contacts in the key jack used to close the key contacts when a key is not present are actually making contact?
John K5MO
On Sat, Mar 16, 2024 at 4:24?PM Don Woodward - KD4APP < dbwoodw@...> wrote:
Yes sir that¡¯s all correct - using the CW and X mode.? No key present.
Any other possible reason?
The radios history is unknown.
73
Don W
KD4APP?
Be sure that the SIDEBAND switch is on "X-CW".? If you're tuning in CW mode, you either need the KEY jack to have nothing plugged in or close the key contacts.? Likewise, if you transmit on SSB and have
a key in the KEY jack, you need to close the key contacts.
73,
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Saturday, March 16th, 2024 at 1:28 PM, Don Woodward - KD4APP < dbwoodw@...> wrote:
I went through the tune up procedure and everything looked good until I got to the last step and the plate current never goes above .1 on the plate meter.
I have set the bias with the PS per the manual.
I checked continuity on the relay (both TX/RX) - it was good on both tests and I see it engage on transmit.
The system receives quite well - especially after tune up.
Looking at the bottom it looks like all the electrolytic capacitors were replaced.? The large electrolytic multi section was replaced by three capacitors under the chassis.
All tubes test good.
At this point I am stumped - unable to get any power out of it.
One other odd thing - if you turn the TX gain up past about three ticks while receiving you can hear an oscillation tone.
I have lots of test gear and have restored several other tube transceivers, receivers and transmitters so this is not my first "radio" LOL.
TIA and 73's
Don W.
KD4APP
?
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Yep. Needs a new bushing. The exact part is Unobtainium but you can make one from a piece of 1/4¡± fuel hose. Cut to the same length as the bushing and ensure the Ends are square or you¡¯ll see the skirt looking crooked when reassembled.?
The inner and outer shaft are meant to rotate at the same time at the same rate. Holding the skirt whilst turning the knob adjusts the fine calibration.?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Sun, Mar 17, 2024 at 02:29, Jim Shorney < jimNU0C@...> wrote:
You may have a bushing issue. Easily fixed.
/g/DRAKE-RADIO/topic/94173997#67672
73
-Jim
NU0C
On Sat, 16 Mar 2024 22:36:59 -0700
"Ron KJ7PAQ via groups.io" <ronburski@...> wrote:
> Hi:
> I am new to this group. I acquired some Drake equipment from the estate of a sk. Starting with the receiver (R-4C) I noticed the two plastic discs with the freq markings don't move when you turn the tuning knob. I removed the cover and saw that the tuning slug moves fine when turning the knob.
>
> Does anyone have an idea what might be wrong, what parts might need to be replaced, are they available?
> Is this going to be a major job? Hope I didn't bite off more than I can chew Hi Hi.
>
> Any advice, suggestions or info would be much appreciated.
>
> 73
> Ron KJ7PAQ
> ronburski@...
>
>
>
>
>
--
73
-Jim
NU0C
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Hmmm.?
Did you already say that you¡¯ve cleaned the tube Pins and switches?
Chances are that it¡¯s not a filter, because you¡¯re getting nothing in either sideband, and I was looking to see if one of them wasn¡¯t working.?
You¡¯re going to need at least a meter and check against the chart in the manual.?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Sat, Mar 16, 2024 at 20:38, Don Woodward - KD4APP < dbwoodw@...> wrote:
I connected my D104 from my Collins KWM-2 and no modulation in either LSB or USB. ?That mic works on the Collins fine. ?I did notice .15ma when I key the mic compared to .1ma with X-CW but no modulation.
Which filters do you suspect? ?I have another TR-3 I was hoping to get working after this one as it belonged to a SK friend, but I might be ok to scavenge something from it as the chassis is in really bad shape on it.
73
Don W
KD4APP?
Any modulation in SSB, with switch in LSB and USB? ?I suspect one of the filters.?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Sat, Mar 16, 2024 at 18:45, Don Woodward - KD4APP < dbwoodw@...> wrote:
Yes, that is closed with no key present and open with one.
73's
Don W
KD4APP?
Can you measure that the contacts in the key jack used to close the key contacts when a key is not present are actually making contact?
John K5MO
On Sat, Mar 16, 2024 at 4:24?PM Don Woodward - KD4APP < dbwoodw@...> wrote:
Yes sir that¡¯s all correct - using the CW and X mode.? No key present.
Any other possible reason?
The radios history is unknown.
73
Don W
KD4APP?
Be sure that the SIDEBAND switch is on "X-CW".? If you're tuning in CW mode, you either need the KEY jack to have nothing plugged in or close the key contacts.? Likewise, if you transmit on SSB and have
a key in the KEY jack, you need to close the key contacts.
73,
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Saturday, March 16th, 2024 at 1:28 PM, Don Woodward - KD4APP < dbwoodw@...> wrote:
I went through the tune up procedure and everything looked good until I got to the last step and the plate current never goes above .1 on the plate meter.
I have set the bias with the PS per the manual.
I checked continuity on the relay (both TX/RX) - it was good on both tests and I see it engage on transmit.
The system receives quite well - especially after tune up.
Looking at the bottom it looks like all the electrolytic capacitors were replaced.? The large electrolytic multi section was replaced by three capacitors under the chassis.
All tubes test good.
At this point I am stumped - unable to get any power out of it.
One other odd thing - if you turn the TX gain up past about three ticks while receiving you can hear an oscillation tone.
I have lots of test gear and have restored several other tube transceivers, receivers and transmitters so this is not my first "radio" LOL.
TIA and 73's
Don W.
KD4APP
?
|
Re: Dumb question of the day.
Paul, you may already know this, but the 8060A has a special high impedance mode for DC voltage measurements. However, it only works in 2V and 200mv ranges. To put it in high impedance mode, you select either 2V or 200mv range and leave all the other switches out. If I remember correctly it offers several hundred Megohms of impedance. With a shunt you could use 100:1 to cover a more useful voltage range. May not offer much in the way of resolution though.
I love that meter. I was issued a brand new one in my Eastman Kodak toolkit in 1982 when I went to work for them as a service rep in 1982. When I saw an 8060A on eBay a few years ago I snagged it. It has become my go to meter around the shack. This is at least partly for nostalgic reasons, but it is also a fine meter. The guy who designed it used to hangout on EEVblog I think his name is Dr. Taylor. That is where I learned about the High impedance mode. It is in the manual, but you know how that goes.
73,
Bob ? N0GGO
|
Re: Soft Rubber Eqp't Feet
How about using gecko tape?:
Feb 25, 2008, Self-cleaning nanotechnology stickies.
Quote: "...
"Our tapes can be cleaned by water, as shown by the leaves of lotus plants" he says. "In addition, the synthetic tapes can also be cleaned by a contact mechanism similar to that exhibited by the gecko. After mechanical cleaning, the shear strength recovers back to 90% (and 60% for water-cleaned samples) of the values measured before soiling.
...
The researchers also tested the self-cleaning properties of these synthetic tapes by contact mechanics. After a couple of contacts with mica or glass substrate they observed that the majority of these particles are transferred to the mica (or the glass) surface.
..."
--
best regards,
Glenn, OZ1HFT
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Jim Shorney
Paul Christensen