[time-nuts] Don't use cheap cables -- a cautionary tale

DaveH info at blackmountainforge.com
Sun Mar 3 16:41:30 EST 2013


Fahnestock clips? 

> -----Original Message-----
> From: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] On Behalf Of Robert Darlington
> Sent: Sunday, March 03, 2013 11:04
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Don't use cheap cables -- a cautionary tale
> 
> Alligator clips,  of course.
> 
> -Bob
> 
> 
> On Sun, Mar 3, 2013 at 11:50 AM, Henk ten Pierick 
> <henk at deriesp.demon.nl>wrote:
> 
> > Hi,
> >
> > The use of double shielded cables does raise the question 
> to what type of
> > connectors to use?
> >
> > Regards,
> >
> > Henk
> >
> > Op 3 mrt. 2013 om 17:30 heeft Jim Lux 
> <jimlux at earthlink.net> het volgende
> > geschreven:
> >
> > > On 3/3/13 8:00 AM, Kevin Rosenberg wrote:
> > >> On Mar 3, 2013, at 7:59 AM, John Ackermann <jra at 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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