On Tue, 12 Feb 2019, 05:58 Patrick Manning <pbmanning@... wrote:
Just to be certain things don't get crossed up, the 85046A is a 50 ohm, 300 kHz to 3 GHz test set, and uses APC 7 connectors to interface with the DUT.? The 85047A is similar, but goes up to 6 GHz.
The 85046B is the 75 ohm version; it goes from 300 kHz to 2 GHz and uses 75 ohm N female connectors to interface with the DUT.
Yes, my error. I got the 85046A and 85046B transposed! The A is the 50 ohm version with APC7 connectors.
I doubt the RF source, A, B or R receiver N connectors would get damaged as they are rarely used.?
?
B
-Pat
Dave.?
On Tue, Feb 12, 2019 at 12:00 AM, Dr. David Kirkby from Kirkby Microwave Ltd wrote:
On Tue, 12 Feb 2019, 04:04 Reginald Beardsley via Groups.Io <pulaskite=[email protected] wrote:
One question I have is how difficult is replacing the N connectors? on a 8753B with an external test set if they are worn out.? Part of what I'm trying to do is is acquire a self sustainable bench.? I want to have tools to fix things.? I can't do anything about the problem of sourcing parts? ?But first of all you have to have the tools to identify the fault.? I've done it with "flint knives and stone axes'" but that is *very* tedious.
To my knowledge all 50 ohm 3 GHz test sets (85046B) have APC7 connectors, not N connectors. If the test set has N connectors then it is almost certainly an 85046A which is a 75 ohm test set, and best avoided.?
Changing the connectors on the test set is unlikely to be practical without changing the complete bridge, although the collets in APC7 connectors can be easily changed if you get a collet extractor, which you could pick up cheaply. It is most unlikely the APC7 connectors are worn out. Most people put APC7 to N adapters and so the APC7 connectors are rarely used.?
