TR7 Extender Boards for sale. And a bad DR7 board, maybe.
I was cleaning out my shack and found my set that I bought about 10? years back. Don't recall ever using them.?
I also found a DR7 Board that I blew up and replaced with a new one. Not sure if that is worth anything, but Jim Shorney told me to save it a few years ago. Hi hi. I fried it by leaving the top cover of the TR7 off and keying another radio that was hooked up to a attic antenna directly above.? At least that is what I remember at the time. Maybe a clue as to what may be the issue.
Offers anyone? I'm too tired to google. :-) I may still sell my TR7 also.?
73
Bill
W4WCS
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Getting back to the original topic..
Dave,
I pulled the last section out of my late T-4X.? Does this look like what you need?? Don't worry about the black tarnish, it conducts great I am told.
Wow, it was hard to get it out, to put it back in is going to be a job for you.
As you can see in the photo, I had to pull the front panel to remove the nut holding the switch so I could get a screwdriver and nutdriver in to take the
wafer off.? Before that I had to remove the crystal switch and shaft.
If that is the switch you need, give me your address and I'll send it down.
73,
Gary
WB6OGD
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Looks like I'm in the market for a parts set or a functioning T4XB.
73, Dave
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Re: Drake 2C on 28.0 to 28.5 MHz
THANK YOU
,73,S TOM
On Friday, March 24, 2023, 07:22:15 PM MDT, Brien Pepperdine <brianpepperdine@...> wrote:
FYI..... Look on this page of the Files area I think for some initial FS4 info, as well as page/tab 4 of Files, and perhaps elsewhere in Files looking for FS4 info. In any case, this is the general and specific area for stuff... /g/DRAKE-RADIO/files?p=name%2C%2C%2C20%2C1%2C20%2C0&jump=1
Brian VE3HI
------ Original Message ------
From: ac5rd@...
To: [email protected]
Sent: Friday, March 24, 2023 8:13 PM
Subject: Re: [DRAKE-RADIO] Drake 2C on 28.0 to 28.5 MHz
info regarding your fs-4..
Tom - AC5RD..
73S TNX
On Friday, March 24, 2023, 06:44:53 PM MDT, wb6ogd <garywinblad@...> wrote:
For the cost of one crystal you could build my FS-4 that generates signals to replace all the crystals for HF. 73, Gary WB6OGD On Mar 24, 2023, at 4:56 PM, Rick Arzadon - N8XI via groups.io <n8xi_1@...> wrote:
? I am looking for a Crystal I can insert into the Aux position of the Drake 2C. I believe it is in an HC-6 can and needs to be a 24.5 MHz XTAL. Or an HC-6 can of any frequency that I can take apart and marry a 24.5 MHz HC-49 XTAL to it. Maybe someone may have a different idea? Thanks 73, Rick - KN8RHM (N8XI)
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Re: Drake 2C on 28.0 to 28.5 MHz
FYI..... Look on this page of the Files area I think for some initial FS4 info, as well as page/tab 4 of Files, and perhaps elsewhere in Files looking for FS4 info. In any case, this is the general and specific area for stuff... /g/DRAKE-RADIO/files?p=name%2C%2C%2C20%2C1%2C20%2C0&jump=1
Brian VE3HI
------ Original Message ------
From: ac5rd@...
To: [email protected]
Sent: Friday, March 24, 2023 8:13 PM
Subject: Re: [DRAKE-RADIO] Drake 2C on 28.0 to 28.5 MHz
info regarding your fs-4..
Tom - AC5RD..
73S TNX
On Friday, March 24, 2023, 06:44:53 PM MDT, wb6ogd <garywinblad@...> wrote:
For the cost of one crystal you could build my FS-4 that generates signals to replace all the crystals for HF. 73, Gary WB6OGD On Mar 24, 2023, at 4:56 PM, Rick Arzadon - N8XI via groups.io <n8xi_1@...> wrote:
? I am looking for a Crystal I can insert into the Aux position of the Drake 2C. I believe it is in an HC-6 can and needs to be a 24.5 MHz XTAL. Or an HC-6 can of any frequency that I can take apart and marry a 24.5 MHz HC-49 XTAL to it. Maybe someone may have a different idea? Thanks 73, Rick - KN8RHM (N8XI)
|
Re: Drake 2C on 28.0 to 28.5 MHz
info regarding your fs-4..
Tom - AC5RD..
73S TNX
On Friday, March 24, 2023, 06:44:53 PM MDT, wb6ogd <garywinblad@...> wrote:
For the cost of one crystal you could build? my FS-4 that generates signals to replace? all the crystals for HF. 73, Gary? WB6OGD?
On Mar 24, 2023, at 4:56 PM, Rick Arzadon - N8XI via groups.io <n8xi_1@...> wrote:
? I am looking for a Crystal I can insert into the Aux position of the Drake 2C. ? I believe it is in an HC-6 can and needs to be a 24.5 MHz XTAL. ? Or an HC-6 can of any frequency that I can take apart and marry a 24.5 MHz HC-49 XTAL to it. ? Maybe someone may have a different idea? ? Thanks 73, Rick - KN8RHM (N8XI)
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Re: Drake 2C on 28.0 to 28.5 MHz
For the cost of one crystal you could build? my FS-4 that generates signals to replace? all the crystals for HF. 73, Gary? WB6OGD?
toggle quoted message
Show quoted text
On Mar 24, 2023, at 4:56 PM, Rick Arzadon - N8XI via groups.io <n8xi_1@...> wrote:
? I am looking for a Crystal I can insert into the Aux position of the Drake 2C.
?
I believe it is in an HC-6 can and needs to be a 24.5 MHz XTAL.
?
Or an HC-6 can of any frequency that I can take apart and marry a 24.5 MHz HC-49 XTAL to it.
?
Maybe someone may have a different idea?
?
Thanks
73, Rick - KN8RHM (N8XI)
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Re: Drake 2C on 28.0 to 28.5 MHz
Howdy Rick,
Here's where I got mine!
--
73/Rick
WA6III
*Every post is created using Linux
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Drake 2C on 28.0 to 28.5 MHz
I am looking for a Crystal I can insert into the Aux position of the Drake 2C.
?
I believe it is in an HC-6 can and needs to be a 24.5 MHz XTAL.
?
Or an HC-6 can of any frequency that I can take apart and marry a 24.5 MHz HC-49 XTAL to it.
?
Maybe someone may have a different idea?
?
Thanks
73, Rick - KN8RHM (N8XI)
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Re: TR7A and R7A Jumper Boards and Digital Jumper Extender Board
Jim and Pete,
Good information.
Chuck
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What the PROM does is it "monitors" the N-Code fed to the Translator board from the DR7 for two purposes. The first is to disable the action of the Up or Down button when your reach the edge of a band switch segment. This keeps you within the limits of the high pass and low pass filter sections of the band switch. The second is to keep your from transmitting outside of a ham band. It is pretty clever really. The address lines of the PROM follow the N-Code and the contents of the PROM memory at any given address will either enable or disable the buttons as needed and also operate Q9001 to inhibit transmit in 500 KHz segments that do not contain a ham band. The radio will work perfectly well with the PROM removed entirely but you would need to be mindful of the filter edges. Worst case, you could smoke a low pass section by transmitting above it's cutoff frequency or transmit unwanted harmonics. A known failure mode of these PROMS is one of the address lines going shorted which disrupts the N-Codes. This may be from careless handling causing ESD damage as the PROM inputs are tied directly to the male Molex pins on the bottom of the board. PROMs are available if you need one. 73 -Jim NU0C On Fri, 24 Mar 2023 15:11:39 -0700 "kmg53 via groups.io" <kmg53@...> wrote: (Belated) Thanks, Nick. I have time again to work on it. I also have the TR-7 service manual which explains what the chip is doing, but I was unclear about why the two legs were broken. I'll be looking up that chip diagram to see how it does what it does.
--
Ken KA4MIE
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Another belated thanks to all others who replied.?
--
Ken KA4MIE
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(Belated) Thanks, Nick. I have time again to work on it. I also have the TR-7 service manual which explains what the chip is doing, but I was unclear about why the two legs were broken. I'll be looking up that chip diagram to see how it does what it does.
--
Ken KA4MIE
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Re: TR-4C Weird Front-End Tuning
I am going to be looking into this, as I have a TR-4Cw RIT that is also doing some squirrely things on 20m.? I can get it to go into what I believe are oscillations on 20m when I adjust the driver, so the first place I'll look will be at the driver circuit.? I also seem to have low output but that may be bad finals.? All will be revealed, once I finish redoing half of my operating position.
73,
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
------- Original Message -------
On Friday, March 24th, 2023 at 5:22 PM, Mark Nace <n5kae@...> wrote:
Hello Everyone.? I am in the last steps in restoring a TR-4C.? I have found that on 20 meters, at 14.250 MHz, when peaking the Rf tune, I can get somewhat better stronger signals.? BUT, I get much better reception when adjusting the PLATE TUNING CAP to about 7.? When I adjust plate tuning to a lower value, I lose all signals on the band.? I don't think either the plate or loading caps should be interacting with receiver performance.? I have done just about everything in cleaning up the radio, tube checks/replacements, deoxit, and other items, except for an alignment.? Has anyone ever experienced this type of thing?? I have never seen this in all the drakes I have restored.?
Many thanks to the group.....you have helped me countless times in the past!
73
Mark
N5KAE
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TR-4C Weird Front-End Tuning
Hello Everyone.? I am in the last steps in restoring a TR-4C.? I have found that on 20 meters, at 14.250 MHz, when peaking the Rf tune, I can get somewhat better stronger signals.? BUT, I get much better reception when adjusting the PLATE TUNING CAP to about 7.? When I adjust plate tuning to a lower value, I lose all signals on the band.? I don't think either the plate or loading caps should be interacting with receiver performance.? I have done just about everything in cleaning up the radio, tube checks/replacements, deoxit, and other items, except for an alignment.? Has anyone ever experienced this type of thing?? I have never seen this in all the drakes I have restored.?
Many thanks to the group.....you have helped me countless times in the past!
73
Mark
N5KAE
|
It looks as if, as I expected, putting together a 20m net would have fewer scheduling conflicts if done on a Saturday.
Does anyone have a handy list of 20m SSB nets?? I'm looking at around 1630 eastern time as being a possibility.? All we need to do now is look at available frequencies.? Unfortunately for me, I will be away from the station Saturday but if any of you have a suggested frequency, let 'er rip.
73,
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
|
Here is a view of the FUNCTION switch in my late production?T-4X. 3 decks, like the B.?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent from Proton Mail for iOS
On Fri, Mar 24, 2023 at 15:19, Steve Wedge, W1ES/4 via groups.io < w1es@...> wrote: Hi, gang!
I have my T-4X in front of me.? I was fortunate to have obtained my A Line from a friend who had had it in storage for around 20 years.? I have replaced the can cap and other electrolytics but otherwise, this is a completely unmolested set with a QC tag indicating that it was inspected on 11 May 1967 by 'WF' -- could have been Bill Frost :-)
The serial number is 13307B (yes, there is a letter on this one!) and is the second latest T-4X in Ron's database. Aside from the dust, it looks almost new.
I suspect that the change in the function switch occurred around the same time that the addition of the crystal characteristics and could have been Drake using up the last of the front panels and chassis before rolling out the B Line.? The mic jack is still on the front panel, the PLATE AMPS meter still goes to 0.4 and it completely appears the same as a T-4X, otherwise.
I will attach a photo of the function switch in a reply to this, as I'm composing this on my computer and took a photo with my phone (it's just easier...).
In the meantime, can any of you who have later T-4X's take a quick look at your transmitters?? In particular, the fastest way to see if it has the later function switch is to try transmitting SSB with a plug in the KEY jack.? If you can get modulation, it's the later version.? Also note the serial number.? This was a functional upgrade to the transmitter that is not really practical to retrofit..
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
|
Wow!? I didn't know they went up that high!? This shows that Drake had issued serial numbers by stamping the chassis first, I would say.? The first T-4XB in Ron's database is 13434, so there's definitely overlap!? The first documented (via QC tag) T-4XB was inspected on 9 April [1971] -- I believe the year is in error, as all the other early T-4XB's were made in 1968.? The last documented T-4X is dated 7 AUG 1967.
For the purposes of this discussion, if you're looking at a parts set for the FUNCTION switch and look at T-4X's, if it has a 3-deck switch, it should be useable in a T-4XB.
73,
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
------- Original Message -------
On Friday, March 24th, 2023 at 11:54 AM, W6MQI via groups.io <w6mqi@...> wrote:
Steve,
?I think you were asking me the serial number of my T4XB is 15349
Dave
|
Hi, gang!
I have my T-4X in front of me.? I was fortunate to have obtained my A Line from a friend who had had it in storage for around 20 years.? I have replaced the can cap and other electrolytics but otherwise, this is a completely unmolested set with a QC tag indicating that it was inspected on 11 May 1967 by 'WF' -- could have been Bill Frost :-)
The serial number is 13307B (yes, there is a letter on this one!) and is the second latest T-4X in Ron's database. Aside from the dust, it looks almost new.
I suspect that the change in the function switch occurred around the same time that the addition of the crystal characteristics and could have been Drake using up the last of the front panels and chassis before rolling out the B Line.? The mic jack is still on the front panel, the PLATE AMPS meter still goes to 0.4 and it completely appears the same as a T-4X, otherwise.
I will attach a photo of the function switch in a reply to this, as I'm composing this on my computer and took a photo with my phone (it's just easier...).
In the meantime, can any of you who have later T-4X's take a quick look at your transmitters?? In particular, the fastest way to see if it has the later function switch is to try transmitting SSB with a plug in the KEY jack.? If you can get modulation, it's the later version.? Also note the serial number.? This was a functional upgrade to the transmitter that is not really practical to retrofit..
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
|
WTB Excellent TR-7 Cabinet
Looking for the above shipped to 99645. I can send a shipping label
Tnx!
KL7AM
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Bill
Gary WB6OGD
W6MQI
Jim Shorney
