Re: CW Operation with T4XC & R4C
GM Gary,
I ran some test with the set up and it works very well.? Thank You
Bill N3WM
On Friday, January 5, 2024 at 07:41:29 AM EST, N3WM - Bill via groups.io <n3wm@...> wrote:
Gary,
Thank you for your response...I really appreciate it. I will give it a try this morning..? you can't beat this Drake group for assistance.
I love the Drake gear but I gotta wonder why they went with this design for operating CW...why not just key a monitor oscillator and leave the transmitter freq alone..this is my opinion of course.
Thanks again Gary....
73's
Bill N3WM
On Thursday, January 4, 2024 at 10:52:58 PM EST, wb6ogd <garywinblad@...> wrote:
Bill,
The simple way is to leave your R-4C ON (as opposed to EXT MUTE).? Turn down the sidetone.
Set Tx to CW, Rx to LSB.
Hit the key.? You now hear your exact transmitted signal.? Note the tone, should be close (though not exact) 850Hz.
Now when you answer another station, tune him to that same frequency.. wha la!? You are on his exact freq or as close as your ear.
It might help to use your tightest filter or use a phone app to read the frequencies until you get used to it.? Also, if the other station
comes back on a slightly different frequency, do not retune him.? If his tone is too far from what you want to hear, go to SEPARATE mode.
850Hz is pretty high, especially with my now old ears so just using separate mode (except in contests) might be good.
73,
Gary WB6OGD
?
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Re: CW Operation with T4XC & R4C
Gary,
Thank you for your response...I really appreciate it. I will give it a try this morning..? you can't beat this Drake group for assistance.
I love the Drake gear but I gotta wonder why they went with this design for operating CW...why not just key a monitor oscillator and leave the transmitter freq alone..this is my opinion of course.
Thanks again Gary....
73's
Bill N3WM
On Thursday, January 4, 2024 at 10:52:58 PM EST, wb6ogd <garywinblad@...> wrote:
Bill,
The simple way is to leave your R-4C ON (as opposed to EXT MUTE).? Turn down the sidetone.
Set Tx to CW, Rx to LSB.
Hit the key.? You now hear your exact transmitted signal.? Note the tone, should be close (though not exact) 850Hz.
Now when you answer another station, tune him to that same frequency.. wha la!? You are on his exact freq or as close as your ear.
It might help to use your tightest filter or use a phone app to read the frequencies until you get used to it.? Also, if the other station
comes back on a slightly different frequency, do not retune him.? If his tone is too far from what you want to hear, go to SEPARATE mode.
850Hz is pretty high, especially with my now old ears so just using separate mode (except in contests) might be good.
73,
Gary WB6OGD
?
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Re: CW Operation with T4XC & R4C
Bill,
The simple way is to leave your R-4C ON (as opposed to EXT MUTE).? Turn down the sidetone.
Set Tx to CW, Rx to LSB.
Hit the key.? You now hear your exact transmitted signal.? Note the tone, should be close (though not exact) 850Hz.
Now when you answer another station, tune him to that same frequency.. wha la!? You are on his exact freq or as close as your ear.
It might help to use your tightest filter or use a phone app to read the frequencies until you get used to it.? Also, if the other station
comes back on a slightly different frequency, do not retune him.? If his tone is too far from what you want to hear, go to SEPARATE mode.
850Hz is pretty high, especially with my now old ears so just using separate mode (except in contests) might be good.
73,
Gary
WB6OGD
?
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CW Operation with T4XC & R4C
Gentlemen,
I have a classic T4XC & R4C set up that I could use some advice with operating CW. Has anyone written a procedure to set them up for CW operation? I have read the paragraph in the T4XC manual stating that the transmitter is about 850 hz below the receiver frequency. I would like to use the receiver as the controlling VFO. The rig works FB on SSB but again there isn't the offset to be concerned with. I just have not had luck netting the T4XC & R4C for CW operation successfully. I am chasing my tail.
I would appreciate any information and comments.
Best 73's
Bill N3WM
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Re: TR7 with low power on 15 and 10 meter
OK, 90 watts is typical for 10m unless it has been repaired with more modern transistors. Sounds like you are on the right track. Don't feel too bad, I have a Yaesu FT707 on the bench that has been driving me nuts. Maybe I'll tell you about it later. Today I am into the PA deck. What a nightmare. It makes me appreciate the Drake design in the TR7. At least you can work on it without disconnecting 47 different things to get to the screws... 73 -Jim NU0C On Thu, 04 Jan 2024 11:34:50 -0800 "Raoul Meunier" <rmeunier@...> wrote: Hehe... Hi Jim,
Yes, I did re-adjust the Pre-Driver gain pot. And the driver bias is there when in Tx.
The voltages are strange and about a possible out of band oscillation on 10m, when I connected the PA directly to the dummy load (through the wattmeter), I checked the signal with a tiny Spectrum Analyzer and I didn't notice anything weird, just the multiples. Power output increased just a little...
I concur that the "parent board", filters and associated wiring may be causing some of this. When I swap the boards from the "bad" rig to the "good" one, I get 90W on 10m, 100W on 15m. |
Thanks for your suggestions, Jim. This rig is behaving differently from any other I've had, so any help is welcome.
73 de Raoul CE3RY
-- 73 -Jim NU0C
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Re: TR7 with low power on 15 and 10 meter
Hehe... Hi Jim,
Yes, I did re-adjust the Pre-Driver gain pot. And the driver bias is there when in Tx.
The voltages are strange and about a possible out of band oscillation on 10m, when I connected the PA directly to the dummy load (through the wattmeter), I checked the signal with a tiny Spectrum Analyzer and I didn't notice anything weird, just the multiples. Power output increased just a little...
I concur that the "parent board", filters and associated wiring may be causing some of this. When I swap the boards from the "bad" rig to the "good" one, I get 90W on 10m, 100W on 15m. |
Thanks for your suggestions, Jim. This rig is behaving differently from any other I've had, so any help is welcome.
73 de Raoul CE3RY
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Need Part Number for TR-6 CW filter
Drakers,?
? ?I need a little help.? I misplaced the manual for my TR-6 and I need the part number for the 300 Hz CW filter.? ??
I tried on-line, however the manual. that I found listed the availability of the CW filter, but not the actual Drake part number.??
Any help would be appreciated
73 es HNY,
Gene K1NR
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Re: T-4XC, R-4C, MS-4, MN-4, AC-4 Manuals
Here's a good site...
http://www.ea1ddo.es/drake.html
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73, Kevin, K8KVN
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Re: T-4XC, R-4C, MS-4, MN-4, AC-4 Manuals
Even quicker, a simple Google search will turn up a plethora of manual sources of varying quality. Some free, others not. 73 -Jim NU0C On Thu, 04 Jan 2024 06:46:53 -0800 "Matthew VE3MXG" <ve3mxg@...> wrote: Good Morning Everyone,
Thank you very much for the quick replies.? They were very helpful!
73 VE3MXG
Matt
-- 73 -Jim NU0C
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I guess I should have avoided confusion on my original?post. The memory of possibly?fixing the issue before with a hayseed capacitor?can was on a different set of twins. I honestly don't remember for sure what the?symptom?was that?led me to install the capacitor?can but it might have been?the issue I now?have with the hum.Thanks for the emails wondering what I meant. So any other thoughts on hum in the cw mode before it takes a trip to the Drake repair guru??
I'd appreciate?some advice
Tim
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Re: T-4XC, R-4C, MS-4, MN-4, AC-4 Manuals
Good Morning Everyone,
Thank you very much for the quick replies.? They were very helpful!
73 VE3MXG
Matt
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Re: Replace Shure 444 Mic Cable
Shure 444 Desk Microphone (High Impedance)? User Guide
Original cable (70A253) was 2-conductor (black and white) shielded with plastic outer jacket,
7 feet (2.1 meters) in length.
For Replacement Straight Cables with Amateur Radio Desk Microphones,
I prefer to use Heil Wire (HW), 2-conductors within shield and 2-conductor UTP.
1.) Readily available in 10, 20, and 50 feet from Heil Sound or DX Engineering.
2.) Black and White conductors within Shield,
designated for Unbalanced or Balanced Microphone Elements.
3.) Red and Blue conductors (Unshielded Twisted Pair) perfect for
DC voltages (control) used by Transceivers for Push-to-Talk (PTT) function.
4.) The Wire Colors used Match usage by Many American microphones (1950s - 1970s)
used with Amateur Radios and Public Address Systems (Shure, Turner, EV)
greg, w9gb
===
WHAT ABOUT COILED CORDS ??
Retractile Cords (Telephone Industry)
Customization by Computer Hobbyists have DIY Addressed this for past 15 years.
They have Added BLING to their Keyboard and USB cables.
DIY Making Coiled Cords
or Repairing Stretched Mobile Microphone Cables !!
YouTube?
Stretched Keyboard Coiled Cable Restored
HOW IT¡¯S MADE ¡ª Retractile Cords
The Reversing Step, shown at the End of the Video, is an Important Step
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Re: Replace Shure 444 Mic Cable
Thanks everyone.
--
73
John?N4YE
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Re: T-4XC, R-4C, MS-4, MN-4, AC-4 Manuals
Matt,
Have a look at ??a very comprehensive site also containing a lot pf manuals.
73 de Rob PA9Z
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Re: T-4XC generating unwanted tuned signal in R-4C
Oh boy, what an enthusiasm ?
Well, the culprit was a resistor of 270 Ohms connected to R59 (to the upper lead in the schematic) and the chassis. Hence pulling down the voltage of a.o. the cathode of the mixer V3 in stand-by (RX) mode, so activating it...
The mod also activated the Carrier Oscillator in AM and CW mode in stand-by mode.
No idea why someone put it there.
Anyway, first QSOs have been made successfully with good reports.
73 de Rob PA9Z
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Re: QRP input to L-4B and L7 Amps
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Re: QRP input to L-4B and L7 Amps
About 10 dB gain, or 10 to 50 watts.
Gary
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On Jan 3, 2024, at 8:55?PM, aa5wg via groups.io <aa5wg@...> wrote:
Hello to the group
How much output power does the L-4B? or L7 produce with QRP (1-5 watts) input on all bands using good tubes.?
Thanks.
Chuck
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QRP input to L-4B and L7 Amps
Hello to the group
How much output power does the L-4B? or L7 produce with QRP (1-5 watts) input on all bands using good tubes.?
Thanks.
Chuck
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Re: T-4XC, R-4C, MS-4, MN-4, AC-4 Manuals
Matt, I fully agree with Richard. I ordered these CDs for download last week as well and it sped up the problem finding in my T-4XC. Send a mail to Carol (Garey K0OAH's XYL) and she will instruct how to order the various CD's.? Carol's mail address is: drake4@.... The website for the CDs is??to get a sneak preview of what you will get.? Defenitely worth the investment! 73 Rob PA9Z
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Re: T-4XC generating unwanted tuned signal in R-4C
Please tell us which resistor in case someone else has the same difficulty.
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On 1/3/2024 10:20 AM, Rob PA9Z wrote: *** SOLVED ***
Dears
After hours of wire tracing and elimination of possible defective components, I finally ended up at a..... stupid mod made by a previous owner for whatever reason.? One single resistor that screwed up the behaviour of various functions of the T-4XC.? @Gary: thanks for the tip!
One other beautiful Drake rig preserved for the future :)
73 de Rob PA9Z
--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
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Gary WB6OGD
Jim Shorney
Greg W9GB
Rob PA9Z