RCA phono jacks on Heath gear

Ian Webb ian_webb at PACBELL.NET
Sat Oct 31 15:57:22 EST 1998


I'd agree with Bob that RCA plugs and jacks are a potential problem.  However
they ARE easy to solder on to all types of small diameter cable.  I'd also
suspect that the difference between 50 and 75 ohms is insignificant at the
frequencies we're talking about and for the uses that we're thinking of.

However, the F-connectors are made for solid center conductor cable, thus RG-58
presents a problem.

Ian, K6SDE


Jim Berry wrote:

> Hello Group,
>
> Bob Miller said:
>
> > interconnects  are 50
> > ohms and not a good match for F systems.
>
> Help me on this one folks.  Is the impedance of a connector determined by
> the pin diameter or the spacing between the pin and the connector outer
> body?
>
> Is there really that much difference between 50 ohm and 70 ohm?
>
> Does anyone know what the impedance of a RCA phono plug really is?  Does it
> really matter?
>
> I have been using and making up all kinds of jumpers using type F connectors
> and RG-6 (70 ohm coax).  What if I was to use F connectors and 50 ohm RG-58?
> That is if it can even be used with F connectors.
>
> 73 Jim K7SLI (Getting ready for all the gremlims and goblins to arrive)
>
> While I am at it, anyone got a manual for a Heath IM-13 VTVM?
>
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