Too bad they couldn't have simply connected it back to the local electrical grid and called it a wash.
Barry - N4BUQ
toggle quoted message
Show quoted text
I wonder what they used for a dummy load?
- Jerry, KF6VB
p.s. It's probably time to get the Beast ( Alpha 78 ) out of the shed
and give it
some exercise before the electrolytics dry out.
|
I was lucky a couple of
years ago, when I was helping a widow with her SK's ham radio
gear.? I was able to get a like new 5 kw Bird dummy load for
$600.? She was happy, I was happy...
I guess I need to build
a bigger amp now...
Steve, NR4M
On 3/7/2024 2:34 PM, Jim Shorney wrote:
toggle quoted message
Show quoted text
Probably a biga$$ Bird. At the 1KW DC input level I have one that would handle it.
73
-Jim
NU0C
On Thu, 07 Mar 2024 11:03:01 -0800
"jerry-KF6VB" <jerry@...> wrote:
I wonder what they used for a dummy load?
- Jerry, KF6VB
p.s. It's probably time to get the Beast ( Alpha 78 ) out of the shed
and give it
some exercise before the electrolytics dry out.
|
Does it take flowing water or only have a reservoir? Water cooled tubes needed distilled water or better. Very pure water is a good insulator. If this needs distilled water you could not just hook it up to a garden hose. There is also the rubbish in the water that gets deposited on anything, like the crust in a kettle.
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On 3/7/2024 12:31 PM, Steve Wedge, W1ES/4 via groups.io wrote: I have a water-cooled Bird load that can take a kW for long enough to measure, when it¡¯s dry. I¡¯ve never run it water-cooled and have tested many L-4/L-7/LK-500/SB-220 type amps over the years. ?If I ran it water-cooled, it could take 2500W, CCS.
Steve Wedge, W1ES/4
--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
|
Jim Shorney writes: Probably a biga$$ Bird. At the 1KW DC input level I have one that would han=
dle it. When the CBC shut down their Athabasca AB TV transmitter (too cheap to upgrade the exciter to ATSC), they abandoned a Bird 5KW dummy load (along with a 2.5KW Bird, and a pair of 5KW transmitters). When I visited the transmitter shack I was *sorely* tempted to unbolt that 5K Bird from the wall and take it home :-) Somewhere here I have pictures ... but I can't find them at the moment. --lyndon
|
I guess if you were in one of the cheap-water states you could just hook it up
to a hose and run water through it to a drain or out to the lawn.
I have a 500W Bird 30dB attenuator. I routinely use it to test kilowatt-output
amps, but only for short bursts.
- Jerry, KF6VB
toggle quoted message
Show quoted text
On 2024-03-07 12:31, Steve Wedge, W1ES/4 via groups.io wrote: I have a water-cooled Bird load that can take a kW for long enough to
measure, when it¡¯s dry. I¡¯ve never run it water-cooled and have
tested many L-4/L-7/LK-500/SB-220 type amps over the years. If I ran
it water-cooled, it could take 2500W, CCS.
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent from Proton Mail [1] for iOS
On Thu, Mar 7, 2024 at 2:34 PM, Jim Shorney <jimNU0C@...> wrote:
Probably a biga$$ Bird. At the 1KW DC input level I have one that
would handle it.
73
-Jim
NU0C
On Thu, 07 Mar 2024 11:03:01 -0800
"jerry-KF6VB" <jerry@...> wrote:
I wonder what they used for a dummy load?
- Jerry, KF6VB
p.s. It's probably time to get the Beast ( Alpha 78 ) out of the shed
and give it
some exercise before the electrolytics dry out.
--
73
-Jim
NU0C Links:
------
[1]
[2] /g/DRAKE-RADIO/message/76568
[3] /mt/104794223/243852
[4] /g/DRAKE-RADIO/post
[5] /g/DRAKE-RADIO/editsub/243852
[6] /g/DRAKE-RADIO/leave/12260778/243852/767576506/xyzzy
|
I have a water-cooled Bird load that can take a kW for long enough to measure, when it¡¯s dry. I¡¯ve never run it water-cooled and have tested many L-4/L-7/LK-500/SB-220 type amps over the years. ?If I ran it water-cooled, it could take 2500W, CCS.
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Thu, Mar 7, 2024 at 2:34 PM, Jim Shorney < jimNU0C@...> wrote:
Probably a biga$$ Bird. At the 1KW DC input level I have one that would handle it.
73
-Jim
NU0C
On Thu, 07 Mar 2024 11:03:01 -0800
"jerry-KF6VB" <jerry@...> wrote:
> I wonder what they used for a dummy load?
>
> - Jerry, KF6VB
>
> p.s. It's probably time to get the Beast ( Alpha 78 ) out of the shed
> and give it
> some exercise before the electrolytics dry out.
>
>
>
>
>
>
>
--
73
-Jim
NU0C
|
Re: Easy Drake Crystal Eliminator.
George, If I read the info on the?QRP Labs vwebsite correctly, the VFO kit you have puts out a square wave signal. They show a kit?that puts out a sinewave, but it isn't available yet. I am curious if you have noticed any spurious issues with the new generator that might be related to the high harmonic content. Bill N0CU
On Thu, Mar 7, 2024 at 12:27?PM George Rybicki < atomant@...> wrote: This is about the easiest way I can think of executing this. QRP Labs VFO/SG kit is about $35 and the case is about the same, plus shipping.
I spent 2 hours completing the kit and enclosure, easy to assemble. I set an offset of +5645 Khz? for the VFO and fed it into the INJ jack, it also has
16 memories. I am very pleased with the results. ( I built a Collins version as well.)
|
Probably a biga$$ Bird. At the 1KW DC input level I have one that would handle it. 73 -Jim NU0C On Thu, 07 Mar 2024 11:03:01 -0800 "jerry-KF6VB" <jerry@...> wrote: I wonder what they used for a dummy load?
- Jerry, KF6VB
p.s. It's probably time to get the Beast ( Alpha 78 ) out of the shed
and give it
some exercise before the electrolytics dry out.
-- 73 -Jim NU0C
|
Easy Drake Crystal Eliminator.
This is about the easiest way I can think of executing this. QRP Labs VFO/SG kit is about $35 and the case is about the same, plus shipping. I spent 2 hours completing the kit and enclosure, easy to assemble. I set an offset of +5645 Khz? for the VFO and fed it into the INJ jack, it also has 16 memories. I am very pleased with the results. ( I built a Collins version as well.) 
|
I wonder what they used for a dummy load?
- Jerry, KF6VB
p.s. It's probably time to get the Beast ( Alpha 78 ) out of the shed and give it
some exercise before the electrolytics dry out.
|
Yeah, that's a shame that we still have such impediments.? In the grand scheme of things, a few 60 year old tubes are nothing.? If I was going to Demark this year, I'd pop a couple in my bag and trade them for a beer but we will not be in the area.? We will be in HB9, DL, OE, OK, F, G, GW, GM and TF this summer.? My XYL is not a ham, so I'm not bringing any radios, unfortunately :-)? I mention this in case you're in any of these areas in June or July.
In a couple years, perhaps, we will get to Scandinavia.? I worked in Copenhagen for a week long ago and have wanted to tour that area.
We will get to the bottom of this.
73,
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Thursday, March 7th, 2024 at 12:26 PM, Michael Jensen <kavigal@...> wrote:
Steve, I'd love the approach of shotgunning, but nope I do not have a complete set.
I do have 2x12ba6 in the mail and 1 12be6 also in the mail, so that will be the starting point.
I did consider and I'd love to get a complete set from K5SVC, but it would add more than 4 times
the money I have in the R4B already, getting tubes from the US to Europe is .. insane..
So thank you to the Danish Government ;)
Anyways, will try the three tube change first, that's kinda where I'm at now.
/Michael
On Thu, Mar 7, 2024 at 5:33?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Now is the time, if you either have a spare set or have another R-4B, to swap every tube out at the same time (¡°shotgunning¡±).
I had an R-4B that was vexing me to no end until I replaced all the tubes and then put swapped the old ones back, one at a time. I found two bad/gassy 12BA6¡¯s and a 12BE6 that passed the tube tester but was no good.
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Thu, Mar 7, 2024 at 09:29, Michael Jensen < kavigal@...> wrote: When unpowered, S1+a hair, so very close to zero.
Have checked the following resistors so fare... Just FYI, nothing more.. R9 1.5K** Board 9 OK
R8 220K** Chassis Right Side -R OK
R12 1.5k**Board 9 OK
R13 1.5K**Board 9 OK
R16 1.5K**Board 7 OK
R17 12K* OK
R24 18K* OK
R136 1k** Chassis Left Side -R OK
R142 4.7K**Board 3 OK
R146 22K** Board 3 -- coil OK
/Michael.
On Thu, Mar 7, 2024 at 3:19?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Yes, I have been bit by one of the meter terminals. It hurts :-). This circuit is at around 150V potential.
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Thu, Mar 7, 2024 at 01:23, Glenn, OZ1HFT < glenn.mh.dk@...> wrote: Hi Michael
More safety: Let the Drake unlugged power plug and cable be visible to you, on your workbench, while you work on the Drake.
(Then it be much harder to get an accidently electric shock.)
--
best regards,
Glenn, OZ1HFT
|
Steve, I'd love the approach of shotgunning, but nope I do not have a complete set.
I do have 2x12ba6 in the mail and 1 12be6 also in the mail, so that will be the starting point.
I did consider and I'd love to get a complete set from K5SVC, but it would add more than 4 times
the money I have in the R4B already, getting tubes from the US to Europe is .. insane..
So thank you to the Danish Government ;)
Anyways, will try the three tube change first, that's kinda where I'm at now.
/Michael
On Thu, Mar 7, 2024 at 5:33?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Now is the time, if you either have a spare set or have another R-4B, to swap every tube out at the same time (¡°shotgunning¡±).?
I had an R-4B that was vexing me to no end until I replaced all the tubes and then put swapped the old ones back, one at a time. I found two bad/gassy 12BA6¡¯s and a 12BE6 that passed the tube tester but was no good.?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Thu, Mar 7, 2024 at 09:29, Michael Jensen < kavigal@...> wrote: When unpowered, S1+a hair, so very close to zero.
Have checked the following resistors so fare... Just FYI, nothing more.. R9 1.5K** Board 9 OK
R8 220K** Chassis Right Side -R OK
R12 1.5k**Board 9 OK
R13 1.5K**Board 9 OK
R16 1.5K**Board 7 OK
R17 12K* OK
R24 18K* OK
R136 1k** Chassis Left Side -R OK
R142 4.7K**Board 3 OK
R146 22K** Board 3 -- coil OK
/Michael.
On Thu, Mar 7, 2024 at 3:19?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Yes, I have been bit by one of the meter terminals. It hurts :-). This circuit is at around 150V potential.
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Thu, Mar 7, 2024 at 01:23, Glenn, OZ1HFT < glenn.mh.dk@...> wrote: Hi Michael
More safety: Let the Drake unlugged power plug and cable be visible to you, on your workbench, while you work on the Drake.
(Then it be much harder to get an accidently electric shock.)
--
best regards,
Glenn, OZ1HFT
|
Re: Drake L7 Power output
I was always under the impression that the tests were terminated before any actual failure happened. 73 -Jim NU0C On Thu, 07 Mar 2024 04:39:40 -0800 "John K5MO" <johnk5mo@...> wrote: Thanks Jim and Paul,
That's impressive.? I wonder what finally gave up the ghost....rig or tube?
Great idea for an ad and getting 1600 entries meant people were paying attention.
John
-- 73 -Jim NU0C
|
Now is the time, if you either have a spare set or have another R-4B, to swap every tube out at the same time (¡°shotgunning¡±).?
I had an R-4B that was vexing me to no end until I replaced all the tubes and then put swapped the old ones back, one at a time. I found two bad/gassy 12BA6¡¯s and a 12BE6 that passed the tube tester but was no good.?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Thu, Mar 7, 2024 at 09:29, Michael Jensen < kavigal@...> wrote: When unpowered, S1+a hair, so very close to zero.
Have checked the following resistors so fare... Just FYI, nothing more.. R9 1.5K** Board 9 OK
R8 220K** Chassis Right Side -R OK
R12 1.5k**Board 9 OK
R13 1.5K**Board 9 OK
R16 1.5K**Board 7 OK
R17 12K* OK
R24 18K* OK
R136 1k** Chassis Left Side -R OK
R142 4.7K**Board 3 OK
R146 22K** Board 3 -- coil OK
/Michael.
On Thu, Mar 7, 2024 at 3:19?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Yes, I have been bit by one of the meter terminals. It hurts :-). This circuit is at around 150V potential.
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Thu, Mar 7, 2024 at 01:23, Glenn, OZ1HFT < glenn.mh.dk@...> wrote: Hi Michael
More safety: Let the Drake unlugged power plug and cable be visible to you, on your workbench, while you work on the Drake.
(Then it be much harder to get an accidently electric shock.)
--
best regards,
Glenn, OZ1HFT
|
Re: Drake SL-2300 2.3-5645kHz Filter Testing
Thanks to all of you.? I will try in the next few days and post results.
--
Regards,
Wes
WA6JYK
|
When unpowered, S1+a hair, so very close to zero.
Have checked the following resistors so fare... Just FYI, nothing more.. R9 1.5K** Board 9 OK
R8 220K** Chassis Right Side -R OK
R12 1.5k**Board 9 OK
R13 1.5K**Board 9 OK
R16 1.5K**Board 7 OK
R17 12K* OK
R24 18K* OK
R136 1k** Chassis Left Side -R OK
R142 4.7K**Board 3 OK
R146 22K** Board 3 -- coil OK
/Michael.
On Thu, Mar 7, 2024 at 3:19?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Yes, I have been bit by one of the meter terminals. It hurts :-). This circuit is at around 150V potential.?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Thu, Mar 7, 2024 at 01:23, Glenn, OZ1HFT < glenn.mh.dk@...> wrote: Hi Michael
More safety: Let the Drake unlugged power plug and cable be visible to you, on your workbench, while you work on the Drake.
(Then it be much harder to get an accidently electric shock.)
--
best regards,
Glenn, OZ1HFT
|
Yes, I have been bit by one of the meter terminals. It hurts :-). This circuit is at around 150V potential.?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Thu, Mar 7, 2024 at 01:23, Glenn, OZ1HFT < glenn.mh.dk@...> wrote: Hi Michael
More safety: Let the Drake unlugged power plug and cable be visible to you, on your workbench, while you work on the Drake.
(Then it be much harder to get an accidently electric shock.)
--
best regards,
Glenn, OZ1HFT
|
I¡¯m not sure if the meter¡¯s resistance/current rating. Do start with a large series resistance when testing.?
I had not considered that the meter itself could be at fault. Where does the needle rest with no power?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Thu, Mar 7, 2024 at 01:02, Glenn, OZ1HFT < glenn.mh.dk@...> wrote: Hi Michael
Warning: Be very careful - do not put your hands or probes into the receiver while turned on.
Without current - remove one wire end to the s-meter. With a (variable) voltage source and a resistor find out if the s-meter works properly through the whole deflection/scale.
Drake R-4B schematic:
http://www.ve6kq.com/drake.html
Without an antenna connected:
Measure how much current goes through the wire exiting s-meter circuit between 820 ohm and 1kohm potentiometer.
Measure how much current goes through the wire exiting s-meter circuit between?s-meter minus and 500 ohm potentiometer.
Hi Steve / W1ES/4 do you know how much current that ought to go through the two wires?
-
Measure the resistors R1, R2, R5, R8, R9, R12, R13, R15, R16, R18, R142, R24, R25 and check if their value are ok - and what their values are.
Measure the voltage across the tube top resistors R5, R9, R13, R15, R16, R142 and note what their values are. Calculate the respective currents I = V/R.
(some ? - danish: https://da.wikipedia.org/wiki/Kirchhoffs_love_(elektriske_kredsl%C3%B8b ) )
Sum pairwise the currents (R5, R9, R13, R15) and (R16, R142) - and see if they somewhat matches currents you measured previously.
I may have made errors - hope you or others point them out before you make your measurements.
--
best regards,
Glenn, OZ1HFT
|
Re: Drake L7 Power output
Thanks Jim and Paul,
That's impressive.? I wonder what finally gave up the ghost....rig or tube?
?
Great idea for an ad and getting 1600 entries meant people were paying attention.
John
|
Re: Latest problem with RV-75
OK, so that means that your TR7 is accurate to 100 KHz +/- 1 count. Which means that when your digital display reads for example 14200.0 your actual frequency can be anywhere between 14200.000 and 14200.099. That is your error when reading the DR7 display. It sounds like your fine tune loop in the RV75 is not incrementing properly for some reason, if the missing steps are being measured on the RF output of the RV75. You didn't tell me what your are actually seeing in 5-5.10. That could be helpful. The number of digits on your counter does not tell us the resolution. From the 5315A manual it looks like it can resolve down to 1 Hz which is what you need. I think I have one of those, or at least a model that looks very much like it. Ah, it's a 5314A. A less fancy member of that family. 73 -Jim NU0C On Wed, 06 Mar 2024 21:37:45 -0800 "K6OXN Bob" <bobk6oxn@...> wrote: My TR7 is spot on with the digital display on freq down to 100 hz or xxxx.1 mhz.? My freq counter also displays the proper freq to 6 digits. What the RV-75 is not doing when tuning is displaying the correct .1hz increment. If you tune you can get the 1khz to change but the .1 will not increment/decrement.? I use an HP 5315A counter for all adjustments.
Thanks
Bob
-- 73 -Jim NU0C
|
Jim Shorney