rf probe

[Fred (FL)]

When bringing "inner conductor" thru the braid, it
can as said - be done by either un-weaving the braided
layer, or arching over the inner conductor - and
pulling it thru the braid via a small opening you make
in the braid itself.

One word of caution - using either method, especially
the "hole in braid" method - make sure that the
braid itself is not wound or formed too tightly
against
the insulation of the inner conductor.  If it is too
tightly wound - there is risk that when you solder the
braid, the heat will conduct back thru the braid, and
melt the inner conductor's insulation layer.

This was a construction trick learned after many
Heathkit projects of past. (HW-32, HW-13, HW-101,
.......)

Cheers, 73's
Fred N3CSY

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[Geoffrey Mackenzie-Kennedy-2]

When I lived in Luxembourg I found a solid plastic cased thing that has two
banana plugs which mate with a DMM and a BNC jack. With a BNC male connector
suitable for a probe's RG-174 cable it is easy to change probes without
moving banana plugs, and soldering to banana plugs is not an issue. Having
the BNC connector and banana plugs in series has not caused any problems,
even at millivolt levels. I don't know who made it unfortunately.

73,
Geoff
GM4ESD



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[Sam Morgan-2]

Geoffrey Mackenzie-Kennedy wrote:
> When I lived in Luxembourg I found a solid plastic cased thing that has
> two banana plugs which mate with a DMM and a BNC jack. With a BNC male
> connector suitable for a probe's RG-174 cable it is easy to change
> probes without moving banana plugs, and soldering to banana plugs is not
> an issue. Having the BNC connector and banana plugs in series has not
> caused any problems, even at millivolt levels. I don't know who made it
> unfortunately.
>
googled for 'bnc to banana plug adaptor' and got lots of hits.
thanks for the idea Geoff.

--
GB & 73's
KA5OAI
Sam Morgan
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[Ron D'Eau Claire-2]

Geoff GM4ESD wrote:

When I lived in Luxembourg I found a solid plastic cased thing that has two
banana plugs which mate with a DMM and a BNC jack. With a BNC male connector

suitable for a probe's RG-174 cable it is easy to change probes without
moving banana plugs, and soldering to banana plugs is not an issue. Having
the BNC connector and banana plugs in series has not caused any problems,
even at millivolt levels. I don't know who made it unfortunately.

----------------------------

The quality of some of those adapters varies a lot, both in their mechanical
and electrical design. One that many Hams have reported works very well is
made by Pomona Electronics in the USA. They are also available in other
countries. Warwick Test Supplies in Warwickshire there is one I've seen
listed. Here in the USA, digikey and many others carry their line.

I don't have that adapter, but I have a lot of Pomoma adapters and
connectors and find them first-rate.  

Ron AC7AC


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