Yes, we all have to learn that lesson...
At the time I use bedea RG-223 and Belden H155 with soldered and crimped
Telegaertner BNC connectors as general purpose cable (up to 2 GHz).
Above that frequency I wouldn't use BNC. If you simply connect your
tracking generator with the spectrum analyzer by using such a BNC cable
there's not one that is absolutely stable when stressing the connector.
I tried several manufacturers, HP, Suhner, Radiall, Rosenberger, it's
always the same.
To make precise measurements I prefer screwed connectors like N or SMA.
Volker
Am 03.03.2013 17:30, schrieb Jim Lux:
On 3/3/13 8:00 AM, Kevin Rosenberg wrote:
On Mar 3, 2013, at 7:59 AM, John Ackermann <j...@febo.com> wrote:
Lesson learned -- use only double-shielded cable in the oscillator
rack (and in any RF measurement path) from now on.
I've learned that lesson as well. John Miles said that RG-58 is
occasionally referred to as 'soaker hose'.
RG-58 (which by the way, is a spec that officially no longer exists as
part of MIL-C17-28, ditto for RG-8, RG-213, etc. The military
apparently doesn't use PVC insulated wire any more.) comes in myriad
forms all of which bear a passing resemblance to each other. (leaving
aside the RG-58A, RG-58, RG-58C differences).
The term seems to be used for any 50 ohm single shield coax that's
about 0.20 inch in diameter with solid polyethylene insulation. You
really need to look at the specific model number to know what the
shielding looks like. It could be anything from a very loose weave of
thin copper strands to something nice and dense.
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