On Apr 14, 2020, at 4:56 PM, Paul Bicknell <paul@...> wrote:

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Hi Steve

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You say the front panel connector is not just a feed through, it has a DC block built into it ?

This is new to me is this only for the 3.5 mm or for all including the N types

Alternatively is it to protect the attenuator

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Paul

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From: [email protected] [mailto:[email protected]] On Behalf Of Steve - Home
Sent: 14 April 2020 14:19
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] hp8350b/hp83595a front panel mod

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Hi Jan,

The semi-rigid is standard .141 with precision stainless steel SMA connectors. It is L-shaped with a bit of an offset in the leg that goes to the front panel connector:

<image001.jpg>

Please note that the front panel connector is not just a feedthrough, it has a DC block built into it. If you substitute a straight bulkhead connector you lose that DC protection. I would recommend removing the rear panel connector and using it instead. You can always revert to rear panel output if you need to. There's precious little room in the plug in to add a relay to allow switching back and forth. If you use your 3.5mm bulkhead connector I'd recommend a connector saver and an external DC block. Better yet go to an SMA bulkhead connector instead of the 3.5mm as I'd bet you'll be using SMA for everything else as 3.5mm connectors are expensive and fragile.

Since you will be mating 3.5mm to SMA do be aware that those connections should be torqued to 5 in/lb, .57 N/m, not the usual SMA to SMA or 3.5 to 3.5 value of 8 in/lb, .9 N/m

If amplitude accuracy needs to be within specs you'll need to do an RF amplitude calibration once everything is in place as you've made changes to the RF output path.

Good luck with the project and let us know how it goes. I've switched an 8340B from rear to front panel output but my 83595A's came with front panel output so I've not needed to modify them.

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Cheers,

Steve K.

WB?DBS

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On 4/13/2020 11:27 AM, Jan de Jongh wrote:

Hi all,

I'm trying to get my RF output on the front panel instead of at the rear on an hp83595a (26.5 GHz), while leaving the rear-panel option intact. I already have the front-panel connector from ebay and need to make a semi-rigid with 3.5mm connectors to (I guess, need to verify) the 55 dB attenuator.

Does anyone know what type of semi-rigid is used by HP in the hp83595a for the RF output and/or has suggestions for sourcing the connectors? (Sorry, complete semi-rigid noob here...) BTW, the front-panel connector I have is an APC3.5 feed through.

Thanks,
Jan

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