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HP8656B attenuator input and output connectors

 

In this unit the attenuator has input and output RF cables connected to it.. I would like to make a couple of test cables using RG316 cable with a BNC MALE on one end of both cables and the other end of the two cables with male and female connectors to measure the RF at the input and the outputs of the attenuator. I thought that these fittings,
to and from the attenuator, were SMC, MALE? and FEMALE, but I was wrong!? What kind of MALE and FEMALE connectors do I need to connect to these cables and sockets to/from the attenuator?
syd/wt1v
 

All the HP attenuators from this era that I have seen use SMA connectors.

Mark
 

The front connector required is definitely an SMA MALE the rear connector is definitely an SMA FEMALE. Direct adapters to BNC can be had on cheaply eBay, they are used for some Beofang Hand portables.

George G6HIG Dover UK
On Sunday, 11 October 2020, 00:16:03 BST, Syd via groups.io <nhuq1@...> wrote:


In this unit the attenuator has input and output RF cables connected to it.. I would like to make a couple of test cables using RG316 cable with a BNC MALE on one end of both cables and the other end of the two cables with male and female connectors to measure the RF at the input and the outputs of the attenuator. I thought that these fittings,
to and from the attenuator, were SMC, MALE? and FEMALE, but I was wrong!? What kind of MALE and FEMALE connectors do I need to connect to these cables and sockets to/from the attenuator?
syd/wt1v

 

Hi Mark

I actually wonder at just how few know the difference between an SMA, SMB and SMC connector. There is at least one HP signal generator that uses an SMC on the attenuator input and an SMA on the output, but it is arguable if it is from the same era.

George G6HIG Dover UK
On Sunday, 11 October 2020, 00:37:16 BST, Mark Bielman <mbielman@...> wrote:


All the HP attenuators from this era that I have seen use SMA connectors.

Mark

 

Hi George,

Good point. I work in the RF world so...

The units I have dealt with are (typically) both female SMA's on the body of the unit (rectangular shape) with the ribbon cable connectors for the solenoids.

Mark
 

Hi Mark

The two attenuator modules in a HP 8656B are not the standard HP rectangular ones, they use a deep drawn metal top hat soldered or spot welded onto a metal base, very possibly they are irreparable.

I hate to admit this but I have almost sixty years experience in the electronics/RF world, there are not many connectors that I cannot identify and have adapters to and from.

Hope you are keeping well and avoiding the Covid virus, stay safe

George G6HIG Dover UK
On Sunday, 11 October 2020, 01:42:35 BST, Mark Bielman <mbielman@...> wrote:


Hi George,

Good point. I work in the RF world so...

The units I have dealt with are (typically) both female SMA's on the body of the unit (rectangular shape) with the ribbon cable connectors for the solenoids.

Mark

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