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According to the QST article, 24 pins. Two 10-pin and one 4-pin were called out, but other combinations have been used.

Another note on the QST article, you don't actually need the 100K resistors if you have the (most common) early Digital Control board. They duplicate resistors on that board.

73

-Jim
NU0C

On Sun, 4 Feb 2024 19:09:12 +0000
"Clint VE3CMQ" <ve6cmm@...> wrote:

Actually, I would need enough to populate 2 boards. I'm not sure how many the boards take.

73, Clint, VE3CMQ

-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Jim Shorney via groups.io
Sent: Sunday, 4 February 2024 12:10
To: [email protected]
Subject: Re: [DRAKE-RADIO] Searching for AUX-7 boards…


Yes, they do still carry them under different part numbers. Look for Molex KK series 156. Here is one example:





73

-Jim
NU0

On Sun, 04 Feb 2024 09:16:06 -0800
"Dale Parfitt" <PARINC1@...> wrote:

I have a bag of the Molex edge connectors used in the TR-7/R7 if anyone is interested. Looks like Mouser no longer carries them.
Dale W4OP

Complete, working C-line for sale. I am the only owner. No mods. R4C includes all filters and 4NB noise blanker. Includes Drake cables and original boxes with packing materials and manuals. $1500 cash obo plus shipping. Selling as a complete package only. Prefer local pickup. Melbourne Florida area.

OK. I was unable to find what I was charging for the cable years ago.? It was most likely 10 cents an inch.? I sold it by the inch as I was getting all kinds of odd lengths.? I will sell off what I have left at 15 cents per inch plus what it costs me to mail it out.? SO, a 38 inch piece would be $5.70 plus actual cost to mail it.? I don't know how much is left on the spool but there is still plenty left, I think, to cover anyone who need any.?
I am good in QRZ. ? I hope this helps anyone who need to make a new injection cable.? Per Gary the actual length was 38 inches? tip to tip.?

Al, n7ioh
Payson, AZ USA

Actually, I would need enough to populate 2 boards. I'm not sure how many the boards take.

73, Clint, VE3CMQ

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I still have a partial roll of the Belden 8421 left.? The original length of the injection cable was 38" TIP to TIP.? I haven't sold any in a long time and forgot what I was charging for it plus the shipping.? I'll have to go back and see what I was selling it for and let you know.
Al, n7ioh
Payson, AZ, USA

Confirms it many times. :D

Here is the original source.

/g/DRAKE-RADIO/message/28549

73

-Jim
NU0C

On Sun, 4 Feb 2024 09:39:21 -0800
"VE7PS" <ve7ps@...> wrote:

Paul:

A quick search of the group posts confirms Belden #8421.

73
Peter
VE7PS

On Sun, Feb 4, 2024 at 9:33?AM Paul Kraemer <elespe@...> wrote:

Excuse the interruption.

Elderly mind forgot---was the cable recommended for 4 line injection
cable Belden 8421?

Or something different?

Thanks

Paul K0UYA

--

73

-Jim
NU0C

Yes, they do still carry them under different part numbers. Look for Molex KK series 156. Here is one example:





73

-Jim
NU0

On Sun, 04 Feb 2024 09:16:06 -0800
"Dale Parfitt" <PARINC1@...> wrote:

I have a bag of the Molex edge connectors used in the TR-7/R7 if anyone is interested. Looks like Mouser no longer carries them.
Dale W4OP

--

73

-Jim
NU0C

I think I fingered out. I now have my 2 mostly used freq's programmed. It has been many years since using BCD, but I am definitely relearning now.? Thanks for the pointing me in the right direction.

73? Bob

That is correct. Rob, NC0B

Excuse the interruption.

Elderly mind forgot---was the cable recommended for 4 line injection cable Belden 8421?

Or something different?

Thanks

Paul K0UYA

I have a bag of the Molex edge connectors used in the TR-7/R7 if anyone is interested. Looks like Mouser no longer carries them.
Dale W4OP

It's really not that hard but I can see how someone can feel intimidated if they have never worked with BCD before. Binary Coded Decimal. Each of our base-10 digits 0 through 9 is encoded as its 4-bit binary equivalent. That is the reason the switches are treated in groups of 4. The weighting (value) of the switches is 8, 4, 2, 1 reading from left to right. Obviously zero would be 0000 (all switches off). One would be 0001, switch one is on. Simple enough. But what is two? If you said switch 2 on you would be correct, 0010. Since the most convenient way to get to three would be to add 2 + 1 that would be switches one and two on, 0011. Four is just switch 4 on, 0100. And so on up through nine, which is 8 + 1 or 1001. Alert readers may note that if we used three bits instead of four we would have to stop at 7 (111) which would not work very well for us.

Once you have the magic number figured out by doing the math for the actual RF frequency you just set the switches accordingly - paying close attention to the switch layout diagram because things look backwards. You might need to twiddle the least significant switch group number a little to compensate for oscillator error in the rig but the formula should get you pretty darn close. Note that there an 800 Hz offset for CW mode, and the TR5 formulas are a little different so don't use those. :)

While you are bending your mind around binary stuff, think about this: What can we two with two bits? That gives is four numbers, 0 1 2, and 3. The filter switches on the TR7 are a two bit switch, giving us a choice of three optional filters. Where else do we see a two bit switch? The A and B buttons on the RV75! Without changing much at all Drake could have given us a third Fixed switch bank by using the case of both buttons pushed in just like the filter switches! And yes, I have thought about doing just that...

How about computer frequency control? I remember hearing of someone doing just that in the pre-CAT days. A relatively simple hardware interface connected in place of one of the switch banks and some custom software would make for a basic CAT interface. But that's a project for someone else.

73

-Jim
NU0C

On Sat, 3 Feb 2024 15:29:58 -0800
"VE7PS" <ve7ps@...> wrote:

Bob:

You are correct....the manual is a nightmare, especially for those of us
not familiar with programming BCD switches. I also believe there is an
error in the manual in one of the mathematical calculations they show.

You have two programmed frequencies available, A and B. A is the right
half of the entire BCD switch row on the back and consists of two 8 switch
groups and one of four. I found it faster and easier to just alter the
switches, starting with the most significant group of four (the 100's) on
the extreme right (as you look at the rear) and get it set right.....for
40m SSB you may want 200 khz. Continue working to the left with each 4
switch group (treat the 8 switch groups as two 4's) until you get down to
the HZ group. Repeat for Switch B on the left, again starting with the 4
switch group just left of the centre of that entire switch row, and working
to the left.

This is harder to explain than it actually is!

Once you get the hang of what the switches do to the numbers, it gets
easier fast.

Good luck!

73
Peter
VE7PS

On Sat, Feb 3, 2024 at 3:08?PM K6OXN Bob <bobk6oxn@...> wrote:

How do I set the Fixed A or B on the back of the RV-75. I am looking at 40
meter SSB frequencies. The manual is not very clear.

Help

73 Bob

--

73

-Jim
NU0C

How do I set the Fixed A or B on the back of the RV-75. I am looking at 40 meter SSB frequencies. The manual is not very clear.

Help

73? Bob

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There nothing at all complex to building the FAUX-7 Far Circuits board. Stuff a bunch of common diodes and some connectors onto a circuit board. Solder. Done.

Compared to street price for 2x genuine AUX-7 plus diode modules for the bands of interest you will save a bunch of money.

73

-Jim
NU0C



On Sat, 3 Feb 2024 11:57:26 -0500
"Joseph K4JNG" <jgraif1@...> wrote:

Unfortunately, I don’t believe I possess the required building skills. I’m going to ask the individual working on my 7-line equipment.



joseph n. graif

k4jng



From: [email protected] <[email protected]> On Behalf Of David
Sent: Saturday, February 3, 2024 11:55 AM
To: [email protected]
Subject: Re: [DRAKE-RADIO] Searching for AUX-7 boards…



The aux 7 from Fair Radio is the way to go.. the rest of parts you can get from Mouser or other supply houses.i have used about 10 of these with no issues.



David Assaf III
W5XU VP8RXU



On Sat, Feb 3, 2024, 10:49 AM Jim Shorney <jimNU0C@... <mailto:jimNU0C@...> > wrote:


You will pay a premium price for a genuine AUX-7. A workable substitute that gives you WARC and VLF coverage is what I call the "FAUX-7" board available from Far Circuits. It is a reproduction of a diode matrix AUX-7 replacement published in QST July 1982. You buy the bare board from them and you supply the diodes and connectors. There is also an article I think on wb4hfn.com <> on building your own AUX-7 board. Neither of these includes the provision for a fixed frequency crystal, but in all my travels I have only seen almost one person who used this.

73

-Jim
NU0C

On Sat, 03 Feb 2024 01:38:55 -0800
"Joseph K4JNG" <jgraif1@... <mailto:jgraif1@...> > wrote:

I am in the hunt for two AUX-7 boards, for my TR7 and R7. Please help if you are able…

Best 73,
joe
K4JNG

--

73

-Jim
NU0C

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