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HP 8591 external reference connector (1250-1499)

 

Hi all,
I am working on getting an HP 89441A up and running (I am trying to measure the multi-path interference of received ATSC TV signals). Before I can dive into it, I need to gather the appropriate cables to interconnect the RF and IF sections. Most are straight forward (BNCs, a db-9 serial cable, etc) but the adapter needed to connect the reference output to reference input on the RF section is a bit, well, weird. According to Keysight Find-A-Part it is HP part number 1250-1499. Googling that part number brings up little in the way of sources, but indicates that it was also used on the 8590 series of spectrum analyzers. Taking a look at the back of my 8591, I could see that it indeed has one which is pictured below. Now the question is where can I get another one? Or, if I can't, will an ordinary BNC jumper work? Why does it need to be this special 1-piece adapter?




Thanks in advance,
Matthew D'Asaro

P.S. I bought the 89441A from a "reputable" surplus equipment dealer and paid $285 for freight service from LA to Seattle for it so it would arrive in good condition. It arrived strapped to a pallet but badly damaged because their ^*&#*&@ shipping department didn't bother to put a single bit of packing material around it. The RF and IF sections were literally placed upside down on top of each other in a bare cardboard box! The box arrived more or less intact, but the unit was not so lucky... I am working with the seller for a partial refund (I don't want to try to ship it back and neither does the seller) but really, people...
 

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A regular BNC cable will work fine.? It's just the "packaging" for? mechanical convenience.

Daun
Daun E. Yeagley II, N8ASB
On 3/7/2020 9:37 PM, medasaro wrote:

Hi all,
I am working on getting an HP 89441A up and running (I am trying to measure the multi-path interference of received ATSC TV signals). Before I can dive into it, I need to gather the appropriate cables to interconnect the RF and IF sections. Most are straight forward (BNCs, a db-9 serial cable, etc) but the adapter needed to connect the reference output to reference input on the RF section is a bit, well, weird. According to Keysight Find-A-Part it is HP part number 1250-1499. Googling that part number brings up little in the way of sources, but indicates that it was also used on the 8590 series of spectrum analyzers. Taking a look at the back of my 8591, I could see that it indeed has one which is pictured below. Now the question is where can I get another one? Or, if I can't, will an ordinary BNC jumper work? Why does it need to be this special 1-piece adapter?




Thanks in advance,
Matthew D'Asaro

P.S. I bought the 89441A from a "reputable" surplus equipment dealer and paid $285 for freight service from LA to Seattle for it so it would arrive in good condition. It arrived strapped to a pallet but badly damaged because their ^*&#*&@ shipping department didn't bother to put a single bit of packing material around it. The RF and IF sections were literally placed upside down on top of each other in a bare cardboard box! The box arrived more or less intact, but the unit was not so lucky... I am working with the seller for a partial refund (I don't want to try to ship it back and neither does the seller) but really, people...

 

On 3/7/20 9:37 PM, medasaro wrote:
I am working on getting an HP 89441A up and running (I am trying to
measure the multi-path interference of received ATSC TV signals). Before
I can dive into it, I need to gather the appropriate cables to
interconnect the RF and IF sections. Most are straight forward (BNCs, a
db-9 serial cable, etc) but the adapter needed to connect the reference
output to reference input on the RF section is a bit, well, weird.
According to Keysight Find-A-Part it is HP part number 1250-1499.
Googling that part number brings up little in the way of sources, but
indicates that it was also used on the 8590 series of spectrum
analyzers. Taking a look at the back of my 8591, I could see that it
indeed has one which is pictured below. Now the question is where can I
get another one? Or, if I can't, will an ordinary BNC jumper work? Why
does it need to be this special 1-piece adapter?
There's nothing particularly special about it, just use a short piece
of decent coaxial cable.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
 

Matthew:

Re: Connector for Ref Osc Intetconnect

It is not special other than being a low profile shape. A BNC - BNC cable will work fine.

If you want a work around - two BNC Male-Female elbows + one BNC Male-Male Barrel space out the same length.
The elbows come in two lengths. Use the shorter.

Hope that helps.

I also have one of these links available - contact me off list....

Dan in Chandler, AZ.
 

All - Thanks. I am glad to hear that a regular piece of short quality BNC (HP 10502A or similar I presume) will work fine. I figured that the special form factor is just for mechanical convenience, but thought I would ask.

Daniel - I sent you email.

-Matthew
 

Daun is right a bnc to bnc will work fine. Do it all the time. Any reasonable cable length will work.
Have fun
Regards
Paul
WB8TSL
 

Thanks all. I have the right piece coming.

-Matthew
 

I used these RA cables on a couple of my HP3325A Function Generators, until I can try to make my own version of the originals. I wonder if there is enough market? to try to sell them?

281414309052

Bnc-Male-RA-to-BNC-Male-plug-right-angle-type-Patch-Cable-Video-15cm-6inch-RG316/

On Sat, Mar 7, 2020 at 9:37 PM medasaro <medasaro@...> wrote:
Hi all,
I am working on getting an HP 89441A up and running (I am trying to measure the multi-path interference of received ATSC TV signals). Before I can dive into it, I need to gather the appropriate cables to interconnect the RF and IF sections. Most are straight forward (BNCs, a db-9 serial cable, etc) but the adapter needed to connect the reference output to reference input on the RF section is a bit, well, weird. According to Keysight Find-A-Part it is HP part number 1250-1499. Googling that part number brings up little in the way of sources, but indicates that it was also used on the 8590 series of spectrum analyzers. Taking a look at the back of my 8591, I could see that it indeed has one which is pictured below. Now the question is where can I get another one? Or, if I can't, will an ordinary BNC jumper work? Why does it need to be this special 1-piece adapter?




Thanks in advance,
Matthew D'Asaro

P.S. I bought the 89441A from a "reputable" surplus equipment dealer and paid $285 for freight service from LA to Seattle for it so it would arrive in good condition. It arrived strapped to a pallet but badly damaged because their ^*&#*&@ shipping department didn't bother to put a single bit of packing material around it. The RF and IF sections were literally placed upside down on top of each other in a bare cardboard box! The box arrived more or less intact, but the unit was not so lucky... I am working with the seller for a partial refund (I don't want to try to ship it back and neither does the seller) but really, people...

Attachments:
 

A very clean BNC jumper to replace the missing ones on the rear of HP equipment can be had by purchasing a couple of Amphenol 112614 right angle BNC connectors and a short length of RG-405/U semi-rigid coaxial cable.? The former can be purchased from several vendors and the latter from your favorite auction site.? Assembly is very simple requiring a couple of strips to the cable and soldering the shield and center conductor to the connector.? The cable has Teflon insulation so soldering of this small cable is a cinch without melting anything.

The BNC connectors have a threaded cover to access the center pin making assembly a cinch.

Greg

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