TR7 Getting ready to sell. But have to deal with the dastardly DR7 board again. I thought.
First, I accidently posted this on a different Group. Hope that is not a terrible? break in protocol.
I have owned this Drake TR7 for probably 15 years or more. I loved the radio. Even when I had to play with the DR7 board every couple of years. My dexterity is getting bad so I decided to sell it along with several peripherals.
?
The display is acting up again. I figured one last time. So the cover is off. UGHH. Interesting enough it appears one? problem is with a small bundle of wires coming from the DR7. Using a wooden spudger I can fix or cause the problem by slightly touching the bundle. Will delve into that more later. The same display issue is caused by rotating the AUX Program switch. I am thinking about spraying some DeOxit spray into if I can reach it from the top.
?
My question, is that a reasonable approach to fix the switch? Thanks Bill W4WCS The wire bundle in question is the one in the top right corner of DR7. 
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Re: MN-4C *range* switch end pieces
I added a few comments to the OpenSCAD source code and tidied
up the file a bit. New versions have been uploaded.
I also renamed them to mn4c-rangeswitch.{scad,stl,gcode}.
--lyndon
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Re: MN-4C inductor switch end pieces
There seems to be at least two styles of knobs for the capacitor switches on the MN-2700, not sure about the MN-4C. ?The two styles I'm familiar with are a cylindrical style and the other is round where the "head" is wider than the body.
On Sunday, December 31, 2023 at 07:43:03 AM EST, David <david.w5xu@...> wrote:
Also think these would fit the tuner 2700.
David Assaf III
W5XU??? VP8RXU
On Sun, Dec 31, 2023, 2:10 AM Lyndon VE7TFX < lyndon@...> wrote: And no, I don't know why I keep calling them the "inductor"
switches.? Apparently my brain is coiled in a knot :-P
--lyndon
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Re: MN-4C inductor switch end pieces
CRL and Oak-Grigsby made the Rotary/Lever switches from 1950s to 1990¡¯s, when ElectroSwitch of Raleigh, NC bought out both companies and relocated to North Carolina. The Switch Shaft for the Knob is 0.187¡± (3/16) x 0.05¡± The Asian Manufacturers use a SMALLER SIZE Shaft !! ?
That difference Drives the Guitar Restorers Crazy.CRL E2-series Switch
Oak-Grigsby 6MLR-series Switch
SMLR series Switch ?- Smallest design with a 3/16¡± or 1/4¡± switch lever
==
Daka-Ware of Chicago (now Davies Molding) originally made the Bakelite Knobs,
like the Top Hat,?Davies #5149
and Tear Drop,?Davies #0091-J?
in Black and later various colors (with switch to Plastic molding in 1960s)
¡ª
There are large number of Asian Knob manufacturers.
WD Music (North Fort Myers, FL) carries these and a Variety of patterns (and colors) for?
Rotary Lever switches and threaded Toggle switches.
Typical pricing for these Knobs are less than $1.50 each.
greg, w9gb
chicago
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Re: MN-4C inductor switch end pieces
Also think these would fit the tuner 2700.
David Assaf III
W5XU??? VP8RXU
On Sun, Dec 31, 2023, 2:10 AM Lyndon VE7TFX < lyndon@...> wrote: And no, I don't know why I keep calling them the "inductor"
switches.? Apparently my brain is coiled in a knot :-P
--lyndon
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Re: MN-4C inductor switch end pieces
And no, I don't know why I keep calling them the "inductor"
switches. Apparently my brain is coiled in a knot :-P
--lyndon
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MN-4C inductor switch end pieces
A while ago I threatened to 3d print some replacement inductor
switch end pieces for the ones that didn't come with my MN-4C. Well
today in a fit of boredom I dusted off the printer and got to work.
These are about as simple as they get, making no attempt to match
the originals (the shape of which I never much liked, anyway). I
printed them in white because I couldn't find the spool of black
filament :-)
They have a pretty good friction fit, but when I replace them with
the correct colour version I'll add a wee blob of Loctite blue on
the end to ensure they don't escape.
OpenSCAD source, STL, and a gcode file of dubious utility are
in the files area (mn4c-bathandle.*).
--lyndon
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Re: CHECK-IN'S TO THE DRAKE TECHNICAL NET
Only some of the net controls.
On Saturday, December 30, 2023 at 02:17:07 PM EST, Scott KF4DDJ via groups.io <twotwo3@...> wrote:
Does this net use netlogger?
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Re: CHECK-IN'S TO THE DRAKE TECHNICAL NET
No offense taken at all! In fact, I have experienced more than one Sunday when the ¡°regulars¡± gather around 20 minutes prior to net time, start chatting and never ask for check-ins. This is definitely a tough group to ¡°crack¡± Yes, I have had some very nice discussions ¡°off-book¡± with several members but can count on about two fingers the times a comment I posted received an ¡°on-book¡± reply and one of those involved giving me a hard time about the color of my meters. Take the current discussion about the illumination of the meters on the L7. I offered a description of mine and it¡¯s the only comment that did not receive a response. It would be nice to know how my L7 compares to others but I guess that is not going to happen. Sorry folks, but that¡¯s been my experience. ? joseph n. graif k4jng ?
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From: [email protected] < [email protected]> On Behalf Of C Solomon Sent: Saturday, December 30, 2023 10:19 AM To: [email protected]Subject: [DRAKE-RADIO] CHECK-IN'S TO THE DRAKE TECHNICAL NET ? I guess I've got a lot of nerve to bring this up, since I won't be around to check in tomorrow...the following is the procedure used by many nets, especially traffic nets.
May I suggest that with each round of check-in's the net control read back the calls he hears, then immediately stand by for add'l sta's?? That way he'll pick up the weaker sta's, those who were stepped on or doubled, and everyone will know whether or not they were heard.?? Currently the initial group of check-in makes their comments, while the remainder doesn't know whether or not they've been recognized.
Just my thoughts, hope I haven't offended anyone.
HAPPY NEW YEAR!
Carl - W5SU
Dallas TX
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Re: TR7 with low power on 15 and 10 meter
This is a strange one. Did you re-adjust the Predriver Gain pot to spec on the swapped PA? Is the driver bias turning on as it should in TX? The voltage strangeness almost suggests that there may be an out of band oscillation on 10m. The LPF would absorb most of the power if far enough above 30MHz. Otherwise I would still lean towards a problem with the HPF or LPF module or associated wiring. You may have more than one problem. Stop making me think this hard on a weekend! :D 73 -Jim NU0C On Sat, 30 Dec 2023 12:50:48 -0800 "Raoul Meunier" <rmeunier@...> wrote: Hi again,
I swapped the PAs between my "good" TR7, #4089, and the "low power on 10m" one, #2904. I also measured the RF voltage at the Driver Input and the Bases of the final transistors.
Results were as shown in the attachment.
As you can see, what confuses me is that even using a "good" PA, the power output on 10m is still low, even using a direct connection to a dummy load.
The RF voltage delivered by the "good" predriver (Version 1) is higher than the original one. However, the RF voltage produced by the? original one is higher than the 3 Volts indicated in the manual. Measurements were made with a 50-MHz Rigol oscilloscope .
Your thoughts will be welcome!
Thanks and 73 de Raoul CE3RY
-- 73 -Jim NU0C
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Re: TR7 with low power on 15 and 10 meter
Hi again,
I swapped the PAs between my "good" TR7, #4089, and the "low power on 10m" one, #2904. I also measured the RF voltage at the Driver Input and the Bases of the final transistors.
Results were as shown in the attachment.
As you can see, what confuses me is that even using a "good" PA, the power output on 10m is still low, even using a direct connection to a dummy load.
The RF voltage delivered by the "good" predriver (Version 1) is higher than the original one. However, the RF voltage produced by the? original one is higher than the 3 Volts indicated in the manual. Measurements were made with a 50-MHz Rigol oscilloscope .
Your thoughts will be welcome!
Thanks and 73 de Raoul CE3RY
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Re: CHECK-IN'S TO THE DRAKE TECHNICAL NET
Does this net use netlogger?
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Re: CHECK-IN'S TO THE DRAKE TECHNICAL NET
2100 UTC in the winter and 2000 UTC in summer, It has been a more or less regional net for a long time but you're right if you want to listen on a remote rig that's when you need to be on.
Most of the USA and Canada switch from local standard time to Daylight time and the next change will be on 10 March 2024.
73,
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 Saturday, December 30th, 2023 at 12:10 PM, Karl du Roi, DK7AL <dk7al@...> wrote: Is it a big problem to add an UTC indication on the web, maybe in the
near future? ?
It would help me to switch to a nearby WebSDR located station for
listening without being always confused by the necessary local time
arithmetic. Thank you in advance.
HNY to all of you.
Karl, DK7AL
On 30.12.23 16:19, C Solomon wrote:
I guess I've got a lot of nerve to bring this up, since I won't be around to check in tomorrow...the following is the procedure used by many nets, especially traffic nets.
May I suggest that with each round of check-in's the net control read back the calls he hears, then immediately stand by for add'l sta's? That way he'll pick up the weaker sta's, those who were stepped on or doubled, and everyone will know whether or not they were heard. Currently the initial group of check-in makes their comments, while the remainder doesn't know whether or not they've been recognized.
Just my thoughts, hope I haven't offended anyone.
HAPPY NEW YEAR!
Carl - W5SU
Dallas TX
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Re: CHECK-IN'S TO THE DRAKE TECHNICAL NET
Is it a big problem to add an UTC indication on the web, maybe in the near future? ?
It would help me to switch to a nearby WebSDR located station for listening without being always confused by the necessary local time arithmetic.? Thank you in advance.
HNY to all of you.
Karl, DK7AL
toggle quoted message
Show quoted text
On 30.12.23 16:19, C Solomon wrote: I guess I've got a lot of nerve to bring this up, since I won't be around to check in tomorrow...the following is the procedure used by many nets, especially traffic nets.
May I suggest that with each round of check-in's the net control read back the calls he hears, then immediately stand by for add'l sta's?? That way he'll pick up the weaker sta's, those who were stepped on or doubled, and everyone will know whether or not they were heard.?? Currently the initial group of check-in makes their comments, while the remainder doesn't know whether or not they've been recognized.
Just my thoughts, hope I haven't offended anyone.
HAPPY NEW YEAR!
Carl - W5SU
Dallas TX
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Re: C Lines will not work on seperate mode
I assume the external freq readout is plugged into the injection port. Try removing it and see if it makes any difference. Just a thought...
73...??? Mark?? AA7TA
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Re: L7 Meter Illumination
Funny¡.I got a new/unused L7E a few years ago. It is my main amp.
¡.¶Ù²¹±¹±ð
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Re: C Lines will not work on seperate mode
Hi Garry
To be specific,? the Xtmr does not supply a frequency at all. Not on separate and not on TXTR. Only the RCVR shows the frequency and only way to use them is to leave it on RCVR as Master only. Definitely aggravating when I come across a DX working split. Not sure if a systematic process of item elimination...
On Sat, Dec 30, 2023 at 10:18 AM, Steve Wedge, W1ES/4 via groups.io <w1es@...> wrote: This can also be a problem with the transistor in the band oscillator or even the carrier oscillator.? The All of these can be checked with a scope but if you don't have one, you should run a wire (not connected to anything in the transmitter -- just near the circuits) from a general coverage receiver to a place near each oscillator and listen.
PTO should be between 4.9 - 5.5 MHz Band oscillator should be band frequency + 11.1 MHz CO should be 5.645 MHz.
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Saturday, December 30th, 2023 at 9:34 AM, Mark - WB0IQK <mgilger@...> wrote:
Bill,
This indicates that your transmitter VFO is probably?not working. If you have another receiver, take a wire from its antenna input and take the other end near the transmitter. You should easily be able to hear the vfo signal somewhere between 4.9 to 5.5 khz. You can also do the same with the R4 to get an idea of what you will hear since it seems to be working OK.?
73's
Mark WB0IQK
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CHECK-IN'S TO THE DRAKE TECHNICAL NET
I guess I've got a lot of nerve to bring this up, since I won't be around to check in tomorrow...the following is the procedure used by many nets, especially traffic nets.
May I suggest that with each round of check-in's the net control read back the calls he hears, then immediately stand by for add'l sta's?? That way he'll pick up the weaker sta's, those who were stepped on or doubled, and everyone will know whether or not they were heard.?? Currently the initial group of check-in makes their comments, while the remainder doesn't know whether or not they've been recognized.
Just my thoughts, hope I haven't offended anyone.
HAPPY NEW YEAR!
Carl - W5SU
Dallas TX
|
Re: C Lines will not work on seperate mode
This can also be a problem with the transistor in the band oscillator or even the carrier oscillator.? The All of these can be checked with a scope but if you don't have one, you should run a wire (not connected to anything in the transmitter -- just near the circuits) from a general coverage receiver to a place near each oscillator and listen.
PTO should be between 4.9 - 5.5 MHz Band oscillator should be band frequency + 11.1 MHz CO should be 5.645 MHz.
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Saturday, December 30th, 2023 at 9:34 AM, Mark - WB0IQK <mgilger@...> wrote:
Bill,
This indicates that your transmitter VFO is probably?not working. If you have another receiver, take a wire from its antenna input and take the other end near the transmitter. You should easily be able to hear the vfo signal somewhere between 4.9 to 5.5 khz. You can also do the same with the R4 to get an idea of what you will hear since it seems to be working OK.?
73's
Mark WB0IQK
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Re: L7 Meter Illumination
Steve,
Good to hear you found the problem with the plate meter. ?What a blessing!
73, Michael Smith, N4KZO
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Bill
Greg W9GB
David
Jim Shorney
Scott KF4DDJ
Karl du Roi, DK7AL