Re: Drake MN7 Tuner Knobs
I worked 60 DXCC entities on 10m alone over the weekend. At least 40 on each of the three other bands I worked. This is what sunspots can do. :) 73 -Jim NU0C On Sun, 03 Mar 2024 16:19:48 -0800 "Bill via groups.io" <billnopic@...> wrote: Back in the house. I was amazed at the "contest" DX today. I barely heard 3 stateside stations calling CQ everyone was DX.....:-)
I must of led a sheltered Ham Life hi hi
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Re: Another TR7 Journey begins
I'm not sure how a wattmeter issue could cause the meter to deflect full left. It would seem like a diode would have to be reversed, unless it is shorted and RF is somehow getting into the IF/Audio board. You have something strange going on there. You can eliminate the wattmeter completely from the equation by disconnecting the FWD WM wire from the Low Pass Filter module. Does any of the wiring or parts show evidence that it has been worked on or altered? 73 -Jim NU0C On Sun, 03 Mar 2024 09:14:42 -0800 "Bill NZ0T" <nz0tham@...> wrote: Thanks again Jim, and DUH on the fixed switches.? I haven't had a chance to exercise those yet but I will.
Looking at the LP filter module schematic I'm suspecting CR2001 and CR2002 the 1N541 diodes in the wattmeter circuit.? Maybe they have gone bad or leaky and are preventing voltage from getting to the FWD/REFL and ALC/Wattmeter? cicuits which IMO would explain the non-functional wattmeter and wonky ALC.? I'll need to check voltages and see what I find.? Doesn't look like much fun replacing those diodes without taking the module out and THAT looks like a real PITA.
Oh well!
73, Bill NZ0T
-- 73 -Jim NU0C
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Re: Drake Technical Net - 3 March 2024
It was a DX contest. Not much DX on 40 daytime... 73 -Jim NU0C On Sun, 03 Mar 2024 23:57:00 +0000 "Steve Wedge, W1ES/4 via groups.io" <w1es@...> wrote: I was over at the granddaughter's place and thought that, in the midst of the ARRL SSB contest that there'd be no room.
Steve Wedge, W1ES/4
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Re: Drake MN7 Tuner Knobs
Thanks again,
Have to check tomorrow and measure.
Back in the house. I was amazed at the "contest" DX today. I barely heard 3 stateside stations calling CQ everyone was DX.....:-)?
I must of led a sheltered Ham Life hi hi
73
Bill
W4WCS
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Re: Drake Technical Net - 3 March 2024
I was over at the granddaughter's place and thought that, in the midst of the ARRL SSB contest that there'd be no room.
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Sunday, March 3rd, 2024 at 5:42 PM, William Shadid <w9mxq@...> wrote:
The Drake Technical Net met at 4:00 PM EST / 3:00 PM CST on Sunday, 3 March 2024. ? There were 32 stations checking in with us, today. The Drake radios used included the following: ? >> Drake Twins (all models): 8 ? >> Drake TR-3 Transceivers: 1 ? >> Drake TR-4 Transceivers (all models): 11 ? >> Drake TR5 Transceivers: 1 ? >> Drake TR7 / TR7A Transceivers: 6 ? The net operated under fairly good conditions, closing at 5:05 PM EST / 4:05 PM CST. ? Join us again on Sunday, 10 March 2024 at 4:00 PM EDT, 3:00 CDT. Net Control will be Ron Baker, WB4HFN. ? (Note on the time change to Daylight Savings Time. The Drake Technical Net is always at 4:00 PM Eastern Time and 3:00 PM Central Time ¨C No matter what time of year.) ? 73, ? Bill Shadid, W9MXQ Drake Technical Net ¨C Net Control for 11 February 2024 W9MXQ@... ? ? ? ?
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Resistance is the most important here.
We now need to measure the TP2 voltage from startup to a point long after warmup.? If this value drifts towards 0V then there is a chance that you have a gassy tube.
The important part here is if the voltage at TP2 with respect to time.
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Sunday, March 3rd, 2024 at 12:50 PM, Michael Jensen <kavigal@...> wrote:
HI again!
Tak for linked Glenn, kunne godt minde lidt om mit problem :). Okay enough "Danglish" .. @Steve, Thanks for taking your time to reply! Detuned and with AVC ON, TP2 voltage is-1.26, right now, I did an adjustment cold, so seems to have dropped ever so slightly after proper warm up.
RF GAIN Pot measures ~12Ohms(seem to be some capacitance) with wires attached, so guess that is quite okay.
Thanks, Michael-oz8abr
On Sun, Mar 3, 2024 at 2:11?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Michael, what is the voltage at TP2? There are other resistors in the bridge circuit and I have seen them go out of tolerance.
What is the resistance reading across the RF GAIN pot?
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Sun, Mar 3, 2024 at 07:09, Glenn, OZ1HFT < glenn.mh.dk@...> wrote: Hi Michael
See this thread:
/g/DRAKE-RADIO/topic/r_4b_agc_issues_part_trois/103544827
--
best regards,
Glenn, OZ1HFT
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Drake Technical Net - 3 March 2024
The Drake Technical Net met at 4:00 PM EST / 3:00 PM CST on Sunday, 3 March 2024. ? There were 32 stations checking in with us, today. The Drake radios used included the following: ? >> Drake Twins (all models): 8 ? >> Drake TR-3 Transceivers: 1 ? >> Drake TR-4 Transceivers (all models): 11 ? >> Drake TR5 Transceivers: 1 ? >> Drake TR7 / TR7A Transceivers: 6 ? The net operated under fairly good conditions, closing at 5:05 PM EST / 4:05 PM CST. ? Join us again on Sunday, 10 March 2024 at 4:00 PM EDT, 3:00 CDT. Net Control will be Ron Baker, WB4HFN. ? (Note on the time change to Daylight Savings Time. The Drake Technical Net is always at 4:00 PM Eastern Time and 3:00 PM Central Time ¨C No matter what time of year.) ? 73, ? Bill Shadid, W9MXQ Drake Technical Net ¨C Net Control for 11 February 2024 W9MXQ@... ? ? ? ?
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Re: R-4B troubleshooting, was Cabinet repainting
Yeah, just looking at the relatively soft material they are crimped to makes me nervous. Once they start to loosen up the end is near. I don't like to mess with the legs at all. 73 -Jim NU0C On Sun, 03 Mar 2024 20:37:07 +0000 "Stan Gammons via groups.io" <buttercup11421@...> wrote: Hi Jim,
On 3/2/24 23:54, Jim Shorney wrote:
Be very careful bending the legs. Those crimps are not very robust.
73
-Jim
NU0C It's not bad if one uses some needle nose pliers to grip the crimp and bend the leg by hand or use another pair of needle nose pliers. Here's a pic of one of the bad pots and a 25K horizontal mount pot with the legs bent minus the wire for the center. Hopefully the 1K pots I ordered from the Epay seller will arrive Tuesday and I can continue troubleshooting the R-4B.
73
Stan
KM4HQE
-- 73 -Jim NU0C
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Re: R-4B troubleshooting, was Cabinet repainting
Hi Jim,
On 3/2/24 23:54, Jim Shorney wrote:
Be very careful bending the legs. Those crimps are not very robust.
73
-Jim
NU0C
It's not bad if one uses some needle nose pliers to grip the crimp
and bend the leg by hand or use another pair of needle nose pliers.?
Here's a pic of one of the bad pots and a 25K horizontal mount pot
with the legs bent minus the wire for the center.? Hopefully the 1K
pots I ordered from the Epay seller will arrive Tuesday and I can
continue troubleshooting the R-4B.
73
Stan
KM4HQE
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Hi Michael
Found a S-meter zero mod - but please check if the problem is gassy tubes, drifted resistors or something else first:
Quote: "...
3. S-Meter Zero Range. Some R-4B's and early R-4C receivers.
..."
--
best regards,
Glenn, OZ1HFT
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HI again!
Tak for linked Glenn, kunne godt minde lidt om mit problem :). Okay enough "Danglish" .. @Steve, Thanks for taking your time to reply! Detuned and with AVC ON, TP2 voltage is-1.26, right now, I did an adjustment cold, so seems to have dropped ever so slightly after proper warm up.
RF GAIN Pot measures ~12Ohms(seem to be some capacitance) with wires attached, so guess that is quite okay.
Thanks, Michael-oz8abr
On Sun, Mar 3, 2024 at 2:11?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Michael, what is the voltage at TP2?? There are other resistors in the bridge circuit and I have seen them go out of tolerance.?
What is the resistance reading across the RF GAIN pot?
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Sun, Mar 3, 2024 at 07:09, Glenn, OZ1HFT < glenn.mh.dk@...> wrote: Hi Michael
See this thread:
/g/DRAKE-RADIO/topic/r_4b_agc_issues_part_trois/103544827
--
best regards,
Glenn, OZ1HFT
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The original Krylon that I was using was discontinued and replaced with the 51613 a few years ago. It's still available from Walmart, although I think only via mail order. I see the price has gone way up, by about double. I used to get it in the stores for around $8 and now it's $18 plus shipping.?
73's,
Mark, WB0IQK
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Re: Another TR7 Journey begins
Thanks again Jim, and DUH on the fixed switches.? I haven't had a chance to exercise those yet but I will.
Looking at the LP filter module schematic I'm suspecting CR2001 and CR2002 the 1N541 diodes in the wattmeter circuit.? Maybe they have gone bad or leaky and are preventing voltage from getting to the FWD/REFL and ALC/Wattmeter? cicuits which IMO would explain the non-functional wattmeter and wonky ALC.? I'll need to check voltages and see what I find.? Doesn't look like much fun replacing those diodes without taking the module out and THAT looks like a real PITA.?
Oh well!
73, Bill NZ0T
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I lower to price to 400 euros
to discuss...
F1FCO
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Re: Drake MN7 Tuner Knobs
You MAY find CLEAR Knob Skirts separately,
that you can attach to rear of the 1-1/2¡± or 2¡± diameter knob.
Clear circular Skirt and its numbering could be DIY Maker/Fabricated.
Since you have ONE of the proper Knobs and Numbered Skirt,
this makes the Maker Process far easier (Correct measures and Indexing).
w9gb
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Re: Late night on 20 Meters
N3FJP ARRL-DX contest logger. 73 -Jim NU0C On Sun, 03 Mar 2024 06:22:43 -0800 "jeffbauman via groups.io" <jeffbauman@...> wrote: Jim,
What logging program are you using?
Jeff
W8KZW
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Michael, what is the voltage at TP2? ?There are other resistors in the bridge circuit and I have seen them go out of tolerance.?
What is the resistance reading across the RF GAIN pot?
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Sun, Mar 3, 2024 at 07:09, Glenn, OZ1HFT < glenn.mh.dk@...> wrote: Hi Michael
See this thread:
/g/DRAKE-RADIO/topic/r_4b_agc_issues_part_trois/103544827
--
best regards,
Glenn, OZ1HFT
|
Hi Michael
See this thread:
/g/DRAKE-RADIO/topic/r_4b_agc_issues_part_trois/103544827
--
best regards,
Glenn, OZ1HFT
|
Hi group!
Recently I acquired an R4B(my first B), have a C line and a TR4C, so not my first rodeo ;).
But this R4B is really teasing me a bit, the S-meter is "stuck" at S5 as soon as the unit is switched to "ON".
So I tried an S-meter calibration but to no avail, Q4 checked out just fine, just for sanity check I also tried to switch the 2 12BA6's(No change).
Also the the S-meter "Zero" has be to be cranked all the way to one endpoint to reach the S5 as minimum deflection.
Now what may be a lead is that no matter what position AVC is in(OFF/FAST/SLOW) it makes no difference the meter sticks to S5.
So any ideas, pointers, measurements, and I would be grateful, first time I dig into a R4B AVC issue.
Kinda starting to think a resistor has wandered off, but where to start...
Thank you all for a great group, I really enjoy to read all the wise comments and suggestions ect, it's a great group!
Best 73's de Michael - oz8abr
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TR7 in the DX contest. She produces results. Search and pounce with an L7 + Butternut vertical. The narrow SSB filter really helps.
--
73
-Jim
NU0C
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Jim Shorney
Bill
ROUSSIERE Pierre
Greg W9GB
