Re: Drake W4 wattmeter woes... 1N295...
Hi Mike
Goto:
Search for 1N295 - NTE109 can replace 1N295.
NTE109 datasheet:
https://www.nteinc.com/specs/100to199/pdf/nte109.pdf
How to purchase:
--
best regards,
Glenn, OZ1HFT
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Re: Drake W4 wattmeter part three
On 2024-01-22 14:36, Steve Wedge, W1ES/4 via groups.io wrote: Yeah, we all have "those projects". I'm finally tearing into a
TS-830S *** I *loved* my TS-830S. Best radio I'd ever had. My only problem with it was the crappy circuit boards. They were not very tolerant of rework. - Jerry, KF6VB
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Re: Drake W4 wattmeter part three
Yeah, we all have "those projects".? I'm finally tearing into a TS-830S that I thought had RF switching issues.? It turned out that the meter switch wasn't making contact.? I took it apart and cleaned it and it's now working but has some other messed up things going on.
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Monday, January 22nd, 2024 at 5:22 PM, mike bryce <prosolar@...> wrote:
Yeah, over the years, I¡¯ve collected quite a few. I¡¯ve never really did anything with them other than line them up on a shelf and look at them. With the weather so crappy, I decided to take them down and test them.?
I have a couple of WH7 watt meters and one was really out of calibration. It calibrated without issue.?
Heathkit loved to build ¡®oscopes¡.. Drake loved to build wattmeters!
mike wb8vge On Jan 22, 2024, at 5:18 PM, Steve Wedge, W1ES/4 via < w1es@...> wrote:
Mike, I'm curious.? How did you get so many bad ones?? Hamfest find?
73,
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Re: Drake W4 wattmeter part three
Yeah, over the years, I¡¯ve collected quite a few. I¡¯ve never really did anything with them other than line them up on a shelf and look at them. With the weather so crappy, I decided to take them down and test them.?
I have a couple of WH7 watt meters and one was really out of calibration. It calibrated without issue.?
Heathkit loved to build ¡®oscopes¡.. Drake loved to build wattmeters!
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On Jan 22, 2024, at 5:18 PM, Steve Wedge, W1ES/4 via < w1es@...> wrote:
Mike, I'm curious.? How did you get so many bad ones?? Hamfest find?
73,
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Re: Drake W4 wattmeter part three
Mike, I'm curious.? How did you get so many bad ones?? Hamfest find?
73,
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Monday, January 22nd, 2024 at 4:53 PM, mike bryce <prosolar@...> wrote:
here is one I¡¯m working on, and I¡¯m fairly confident it¡¯s not a Drake factory meter.
Mike, wb8vge? On Jan 21, 2024, at 2:11 PM, Jim Shorney < jimNU0C@...> wrote:
Yeah, there were some surplus Motorola repeater rack meters floating around eBay for a while that were almost the correct Jewell version but were more sensitive. I bought one, added an external shunt, and rescued a WV4. It's possible that someone got ahold of one of those and didn't understand the concept.
73
-Jim
NU0C
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Good work getting it going Joe.
The 2NT/2C really is a sweet combination
John K5MO
On Mon, Jan 22, 2024 at 2:58?PM Joe KI5O < ki5ojoe@...> wrote: I was running into more problems this afternoon on the 2NT. Relay was not releasing. Checked the voltage to ensure the cutoff was happening. Slightly lifting on the arm stretched it back into the correct position and QSK and delay changes are better than ever. Looking like the relay was deformed a bit by previous owner pressi down on it trying to get it working.
I wonder if the previous owner sold it because of this problem? Anyhow I just wanted to document in case somebody else comes across this at another time. The two problems with inoperative 2NT delay were bad 15M potentiometer (thanks Bob!) and the relay arm needing slight adjustment.
Joe ki5o?
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Re: Drake W4 wattmeter part three
here is one I¡¯m working on, and I¡¯m fairly confident it¡¯s not a Drake factory meter.
Mike, wb8vge?
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Show quoted text
On Jan 21, 2024, at 2:11 PM, Jim Shorney < jimNU0C@...> wrote:
Yeah, there were some surplus Motorola repeater rack meters floating around eBay for a while that were almost the correct Jewell version but were more sensitive. I bought one, added an external shunt, and rescued a WV4. It's possible that someone got ahold of one of those and didn't understand the concept.
73
-Jim
NU0C
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I was running into more problems this afternoon on the 2NT. Relay was not releasing. Checked the voltage to ensure the cutoff was happening. Slightly lifting on the arm stretched it back into the correct position and QSK and delay changes are better than ever. Looking like the relay was deformed a bit by previous owner pressi down on it trying to get it working.
I wonder if the previous owner sold it because of this problem? Anyhow I just wanted to document in case somebody else comes across this at another time. The two problems with inoperative 2NT delay were bad 15M potentiometer (thanks Bob!) and the relay arm needing slight adjustment.
Joe ki5o?
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Re: 2NT side tone quality
Easy fix, the ballasts on my garage florescent fixtures were creating hash. Turned off the lights and great tone.?
Joe ki5o?
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Re: DRAKE TECHNICAL NET 7.238 UPDATE
It looks like my T-4X still needs work (or its cable does). We had company, so I bowed out.?
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Mon, Jan 22, 2024 at 09:50, Mark - WB0IQK < mgilger@...> wrote: Today Evan, K9SQG was the NCS for today's net.? He had 37 check-ins. The net always starts at 4PM Eastern on 7.238 +/- QRM.
The band was in really good condition. The following radios were used?:
?
A-LINE - 2
B-LINE - 2
C-LINE - 7
TR4(X) - 10
TR5 - 4
TR7(x) - 6
OTHERS - 6
?
73'S,
Mark, WB0IQK
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DRAKE TECHNICAL NET 7.238 UPDATE
Today Evan, K9SQG was the NCS for today's net.? He had 37 check-ins. The net always starts at 4PM Eastern on 7.238 +/- QRM. The band was in really good condition. The following radios were used?:
?
A-LINE - 2
B-LINE - 2
C-LINE - 7
TR4(X) - 10
TR5 - 4
TR7(x) - 6
OTHERS - 6
?
73'S,
Mark, WB0IQK
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Good day,?
Moving further ahead towards completion of getting this novice station back in line. No that the delay potentiometer is sorted, I'm now focused on the side tone.
Setup is 2NT, 2C, 2BQ, HA-5 VFO as well as crystals.
Everything is operating well and I have made some contacts again today. When using the side tone, the note sounds good but there is also a strong buzzing sound. Previously before the 2C was acquired, I was just listening directly without side tone on the 2B.?
Both the 2NT and 2C have been recapped. Please let me know if you have any thoughts!
Joe ki5o?
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Bob thank you for the help on this. The potentiometer arrived today and the delay adjustment is working perfectly.
Joe ki5o?
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Re: Drake W4 wattmeter part three
Yeah, there were some surplus Motorola repeater rack meters floating around eBay for a while that were almost the correct Jewell version but were more sensitive. I bought one, added an external shunt, and rescued a WV4. It's possible that someone got ahold of one of those and didn't understand the concept. 73 -Jim NU0C On Sun, 21 Jan 2024 09:28:41 -0800 "jerry-KF6VB" <jerry@...> wrote: On 2024-01-21 09:21, mike bryce wrote:
I¡¯m wondering if at one time someone swapped out the meter for
something much more sensitive instead of the stated 200uA one Drake
used. *** I can easily imagine somebody scoring a nice meter and just sticking
it in.
Once upon a time...
...As a preteen in San Francisco, I attended an after school electronics
program known as "Lux Labs". We had lectures, and we built projects.
One
of our first projects was a crystal radio. The program provided us with
all
the parts, including a cheap headset.
Down on Radio Row, I scored a really nice Western Electric headset.
For some reason, my crystal radio never worked. The instructor
checked all my
wiring, pulled on my solder joints - all OK. But not a peep out of it.
Some twenty years later, I woke up one morning, sat up in bed, and
said "600 ohms!"
...which was surely the input impedance of that nice WE headset. Way
too low for
a crystal radio.
- Jerry, KF6VB
-- 73 -Jim NU0C
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Re: Drake W4 wattmeter part three
On 2024-01-21 09:21, mike bryce wrote: I¡¯m wondering if at one time someone swapped out the meter for
something much more sensitive instead of the stated 200uA one Drake
used. *** I can easily imagine somebody scoring a nice meter and just sticking it in. Once upon a time... ...As a preteen in San Francisco, I attended an after school electronics program known as "Lux Labs". We had lectures, and we built projects. One of our first projects was a crystal radio. The program provided us with all the parts, including a cheap headset. Down on Radio Row, I scored a really nice Western Electric headset. For some reason, my crystal radio never worked. The instructor checked all my wiring, pulled on my solder joints - all OK. But not a peep out of it. Some twenty years later, I woke up one morning, sat up in bed, and said "600 ohms!" ...which was surely the input impedance of that nice WE headset. Way too low for a crystal radio. - Jerry, KF6VB
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Re: W4 has 1N34A available for it.
I was going to buy some Fluke test meter leads from Amazon. After reading the reviews, it was apparent the leads Amazon was selling were fake Chinese junk.
mike wb8vge
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On Jan 21, 2024, at 12:19 PM, Lyndon VE7TFX <lyndon@...> wrote:
Frank Barnes writes:
Amazon will sell us all the 1N34A's we want and the prices are inexpensive,
about 60 cents each with free delivery for Prime members. And the odds are close to 100% that none of those are actual 1N34s.
Amazon semiconductors are almost guaranteed to be fakes. Don't Do
It.
--lyndon
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Re: Drake W4 wattmeter part three
Gang,
Before I celebrate too much, I have a couple more W4 meters that have the opposite problem¡ªtoo much deflection¡ªcan¡¯t set the calibration
If I apply 100W, the meter begs, and if you switch scales to 2000W, 100W of RF shows 900W
Again, a look at the simple schematic will help when I try to explain what I ended up doing.
On the 200W scale, trimmer R4 sets the calibration. On the 2000W scale, trimmer R4 is still used, but then R3, R2 are in series.
So I measured resistance between the cathode of D1 to the brown wire that goes to the 200W selector. I read 12K (the trimmer is actually 12K) and of course I can adjust the value down to about 100¦¸ or so.
Switch to 2000W scale, and measured about 80K¦¸ of resistance from the cathode of D1 to the wire that goes to the 2000W selector tab.
The wiring to both the 200W and 2000W meter positions are in perfect working order. So why does the meter go off scale no matter where the trimmers are set?
What I ended up doing was to insert a resistor in series with the wire that runs to the selector switch on both power levels.
On the 200W scale, I ended up with 62K, and the 2000W scale required a whopping 220K!
I¡¯m wondering if at one time someone swapped out the meter for something much more sensitive instead of the stated 200uA one Drake used.
Mike wb8vge
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Re: Drake W4 wattmeter woes and some success
On 2024-01-21 08:58, Ralph Mowery via groups.io wrote: Part of my job was to calibrate all kinds of instruments in a large
plant. *** I did that too! I worked in the instrument shop at GTE Lenkurt. Mostly I did repairs, but calibration was never far from our minds. We piped 10Mhz all over the plant to feed the various instruments. There was a rubidium standard in the back room. Once a day, a guy would set the old standard to the rubidium one using a Lissajous figure. - Jerry, KF6VB
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Re: W4 has 1N34A available for it.
Frank Barnes writes: Amazon will sell us all the 1N34A's we want and the prices are inexpensive,
about 60 cents each with free delivery for Prime members. And the odds are close to 100% that none of those are actual 1N34s. Amazon semiconductors are almost guaranteed to be fakes. Don't Do It. --lyndon
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Re: W4 has 1N34A available for it.
I purchased 1N34As on eBay and didn¡¯t figure they were actually silicon diodes until after the boards were stuffed and flow soldered.
Rob, NC0B
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On Jan 21, 2024, at 10:12 AM, jerry-KF6VB <jerry@...> wrote:
?On 2024-01-21 08:53, mike bryce wrote:
One has to be very careful about buying electronic parts from Amazon.
Lots of counterfeit stuff here. *** Reviews on one of the 1N34 listings say that they are silicon
Hot Carrier Diodes.
One can find 1N34A's that are believably authentic on Ebay.
- Jerry
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Jim Shorney
Rob Sherwood