Are you thinking of or have done the 6146 mod? Never really heard of anyone doing this except K5DKZ
Dave
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Hi John, Thanks for your reply. Would you contact me please at aa5wg@...?or? 231-668-1115. Sir, thank you. 73, Chuck?
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TR7/R7 Extender Boards and Puller
Hello to the group. I am looking for a set of extender boards and puller for the Drake TR7/R7. Thank you for your time and consideration. 73, Chuck aa5wg@...231-668-1115
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People would be better off if they scraped the numbers off the old rigs s-meters.
As you have a calibrated generator you probably have a meter you can put across the speaker.? Send in a low level signal in the two rigs and see if you can hear or measure the audio at the speaker and see if the two? rigs seem to hear the weak signal equally.? This will tell you if the low s-meter indicates a problem or just a low meter reading.
Ralph ku4pt
On Monday, March 27, 2023 at 04:51:31 PM EDT, Skip via groups.io <wb4yvo@...> wrote:
Haven't powered up in a while. So I thought I would..? Measured the signal strength using a Calibrated HP Signal Generator..? at -73DBM.? OR S9.. I got the following.. ??????????????????? R4C??????????? T4XC 3.5 ?? Mhz??????? S6????????????????? S2 7.1??? Mhz??????? S8????????????????? S9 14? ?? Mhz??????? S9????????????????? +10 21???? Mhz??????? +10??????????????? +10 28.5? Mhz???????? S9???????????????? +10 They should all be the same I would think...They are NOT Question? Why?? Does this need a good alignment?? Looks like the 3.5 Mhz is way off.. Skip
_._,_._,_
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I looked this situation with my early T-4X.? It had the 1meg resistor.
Looking at the AGC out on pin 3 of the CInch-Jones, I see good AGC action, the louder you scream into the mic, the more negative the AGC voltage.
It is a slow AGC, it doesn't follow speech syllables, its not meant to be a speech compressor.? I do see a lot of carrier oscillator signal on the AGC line,
not sure that is good...?
I didn't have a 15K handy so I put a 20K across the 1meg.? It still shows AGC negative voltage with loud voice, but not as much.? So it reduced the AGC but
AGC did work in both cases.? WIth less the 15K the meter will go higher but that probably means that the finals are being driven too much which will cause them
to go non-linear, NOT what you want.
So I say this myth is BUSTED, I am leaving it at 1meg like the engineers at Drake designed.? NOTE too, my T-4XB still has 1meg so Frank isn't totally correct
that it was fixed in later models.? Maybe it fixes his 6146 mod?
73,
Gary
WB6OGD
?
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The R-4C is not S9 with a -73 dBm test signal.? -80 dBm to even -85 dBm is more typical for S9 from 80m through 10m.?? 160m is typically 10 dB lower in gain.?
(That doesn¡¯t matter at all due to 160m band noise.)
?
If in transceive mode, the T-4XC LO injection is another variable as your data appears to show.? None of the Drake mixers are near saturation, thus gain differences
are typical in transceive mode due to LO level differences.?
?
As a starting point consider the attached alignment tips.? (You can ignore the FPS-4 information.)
?
Rob, NC0B
?
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From: [email protected] [mailto:[email protected]]
On Behalf Of Skip via groups.io
Sent: Monday, March 27, 2023 2:51 PM
To: [email protected]
Subject: [DRAKE-RADIO] Drake T4XC and R4C
?
Haven't powered up in a while. So I thought I would..? Measured the signal strength using a Calibrated HP Signal Generator..? at -73DBM.? OR S9..
I got the following..
??????????????????? R4C??????????? T4XC
3.5 ?? Mhz??????? S6????????????????? S2
7.1??? Mhz??????? S8????????????????? S9
14? ?? Mhz??????? S9????????????????? +10
21???? Mhz??????? +10??????????????? +10
28.5? Mhz???????? S9???????????????? +10
They should all be the same I would think...They are NOT
Question? Why??
Does this need a good alignment?? Looks like the 3.5 Mhz is way off..
Skip
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Haven't powered up in a while. So I thought I would..? Measured the signal strength using a Calibrated HP Signal Generator..? at -73DBM.? OR S9..
I got the following..
??????????????????? R4C??????????? T4XC
3.5 ?? Mhz??????? S6????????????????? S2
7.1??? Mhz??????? S8????????????????? S9
14? ?? Mhz??????? S9????????????????? +10
21???? Mhz??????? +10??????????????? +10
28.5? Mhz???????? S9???????????????? +10
They should all be the same I would think...They are NOT
Question? Why??
Does this need a good alignment?? Looks like the 3.5 Mhz is way off..
Skip
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I¡¯ve not tried that.?
The beauty of powder BKF is that it¡¯s also super cheap :-)
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent from Proton Mail for iOS
On Mon, Mar 27, 2023 at 11:53, Richard Knoppow < 1oldlens1@...> wrote: FWIW another cleaner called ZUD seems to be identical.? I think both are available in liquid as well as powder form.??
-------- Original message -------- From: "Steve Wedge, W1ES/4 via groups.io" <w1es@...> Date: 3/27/23 8:44 AM (GMT-08:00) Subject: [DRAKE-RADIO] Cleaning crystals.
I was enjoying some casual time with putting my Collins receiver back together and decided to try getting the crystals better looking than the greenish-brown that they were. I¡¯ve seen Drake crystals that sometimes look this bad and decided to try an old standby: Bar Keeper¡¯s Friend.?
It took very little effort to make these crystals look like they did in 1964.?
Bonus: BKF seems to help with old, dull knobs, too. I¡¯ve been using a handi-wipe but could see getting this loaded into a Dremel buffing pad.?
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent from Proton Mail for iOS
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FWIW another cleaner called ZUD seems to be identical.? I think both are available in liquid as well as powder form.??
toggle quoted message
Show quoted text
-------- Original message -------- From: "Steve Wedge, W1ES/4 via groups.io" <w1es@...> Date: 3/27/23 8:44 AM (GMT-08:00) Subject: [DRAKE-RADIO] Cleaning crystals.
I was enjoying some casual time with putting my Collins receiver back together and decided to try getting the crystals better looking than the greenish-brown that they were. I¡¯ve seen Drake crystals that sometimes look this bad and decided to try an old standby: Bar Keeper¡¯s Friend.?
It took very little effort to make these crystals look like they did in 1964.?
Bonus: BKF seems to help with old, dull knobs, too. I¡¯ve been using a handi-wipe but could see getting this loaded into a Dremel buffing pad.?
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent from Proton Mail for iOS
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Re: TR7 Extender Boards for sale. And a bad DR7 board, maybe.
Extender boards needed for trouble shooting, alignment think not so much.
Keith
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On Mar 27, 2023, at 4:36 AM, aa5wg via groups.io <aa5wg@...> wrote:
?Chuck Pool - AA5WG
Suttons Bay, Michigan
231-668-1115
aa5wg@...
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Hi Chuck,
It is.
--
73
John?N9FCA
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Re: TR7 Extender Boards for sale. And a bad DR7 board, maybe.
Bill, I know the feeling! I can use a board with the counter section not functioning. The all-band coverage portion does have to work.
No hurry. Contact me off list at k9ju@.... Thank you.
73, Bob K9JU
Maryville, TN
On Sunday, March 26, 2023 at 09:58:52 PM EDT, Bill via groups.io <billnopic@...> wrote:
Bob, The DR7 Board has been sitting in storage for almost 10 years if not longer. I don't recall the actual problem. If I decide to take the existing one out and clean the contacts again! For probably the 5th time. I will try inserting the defective one. No guarantee. My dexterity is gone and that is why I am considering selling the entire TR7. 73 Bill
W4WCS?
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On Sun, Mar 26, 2023 at 01:09 PM, Dave wrote:
Attached is a picture of my knob and switch. It is not as rusty as the
other picture.
The shaft does have a flat spot on it and there is a bushing inside the
knob.
Unfortunately the set screw hole does seem to be stripped and will not
tighten.
?
Dave, it appears someone lost the original reducer bushing and attempted to use the separator bushing instead. No wonder they stripped it out. The two bushings are not identical. As you can see in my photo, the insert has the necessary D shape. I'd recommend putting that bushing back on the shaft and trying various available materials to make a new reducer insert for the knob. If the knob isn't split, perhaps you can drill and tap for a larger set screw.? -- 73 de Steve K9NUD ..
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Re: TR7 Extender Boards for sale. And a bad DR7 board, maybe.
Chuck Pool - AA5WG
Suttons Bay, Michigan
231-668-1115
aa5wg@...
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Re: TR7 Extender Boards for sale. And a bad DR7 board, maybe.
Hi to the group.
I am still looking for the extender boards to align the TR7 and R7.
Thank you.
Chuck - AA5WG
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Hi john - N9FCA
Is your L-7 low pass circuit still available?
Thank you.
Chuck - AA5WG
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Re: WTB: 80 Meter , 14.1 Mhz Crystal
Skip:
Don't give up on the xtal just yet.? BAKE IT in an oven at close to 375 deg F?( and NO HIGHER) for 1-2 hours, cool it and try it again.? You may find it will work fine, and you've got nothing to lose!? Many of us here have revived "dead" or off frequency xtals that way over the?years.? Doesn't alway work....but worth a try.
GL
73 Peter VE7PS
Looking for a 14.1 Mhz Xtal for my drake..? its for 3.5-4.0 Mhz... Mine just died..?
And NO its not the circuit? I put in a 15.6 and everything worked.. so its a bad Xtal..
Not looking to pay for a AF4K over priced crystal..
Anyone have a spare from a Junker radio???
Skip
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Re: TR7 Extender Boards for sale. And a bad DR7 board, maybe.
i don't know if mine are OEM, but the measure 4 and 1/8 inches long. The Board that is, and from the tip of the pins to the tip of the socket is 4 and 13/16 inches.? Hope this helps.
73? Bob? K6OXN
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WTB: 80 Meter , 14.1 Mhz Crystal
Looking for a 14.6 Mhz Xtal for my drake..? its for 3.5-4.0 Mhz... Mine just died..?
And NO its not the circuit? I put in a 15.6 and everything worked.. so its a bad Xtal..
Not looking to pay for a AF4K over priced crystal..
Anyone have a spare from a Junker radio???
Skip
Will NOT allow me to edit the subject..
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Re: TR7 Extender Boards for sale. And a bad DR7 board, maybe.
Bob, The DR7 Board has been sitting in storage for almost 10 years if not longer. I don't recall the actual problem. If I decide to take the existing one out and clean the contacts again! For probably the 5th time. I will try inserting the defective one. No guarantee. My dexterity is gone and that is why I am considering selling the entire TR7. 73 Bill
W4WCS?
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W6MQI
Gary WB6OGD
Rob Sherwood
Skip
Steve K9NUD
Bill