[Boatanchors] Drake cable question

[Richard Knoppow]

----- Original Message ----- 
From: <bonddaleena at aol.com>
To: <rayfrijr at msn.com>; <1oldlens1 at ix.netcom.com>; 
<boatanchors at mailman.qth.net>
Sent: Saturday, June 07, 2014 2:34 PM
Subject: Re: [Boatanchors] Drake cable question


Thanks to all who have responded. I'm gonna do a simple 
experiment....
I have several lab quality cap meters/bridges. One is 
traceable to NIST standards.
When I finally find my RG-62, I am going to measure the 
capacity of it and every other coaxial cable I can get my 
paws on.
I think a 3 foot sample will be OK.
Comments??

ron
N4UE

    Be interesting to see what you find.  In general, the 
capacitance of coaxial cable is related to its impedance 
(lower impedance = higher capacitance) and the dielectric 
constant of the dielectric, again the higher the greater the 
capacitance for a given thickness. The capacitance per foot 
is usually given in the catalog characteristics of the 
cable.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com





-----Original Message-----
From: RAY FRIESS <rayfrijr at msn.com>
To: Richard Knoppow <1oldlens1 at ix.netcom.com>; bonddaleena 
<bonddaleena at aol.com>; boatanchors 
<boatanchors at mailman.qth.net>
Sent: Fri, Jun 6, 2014 8:02 pm
Subject: RE: [Boatanchors] Drake cable question



You are probably thinking of the Heathkit rigs.  Heath did 
recommend RG 62 for some of the connections between the sb 
300 and 400.



> Date: Fri, 6 Jun 2014 16:28:17 -0700
> From: 1oldlens1 at ix.netcom.com
> To: bonddaleena at aol.com; boatanchors at mailman.qth.net
> Subject: Re: [Boatanchors] Drake cable question
>
>
>
>
> -----Original Message-----
> >From: Ron Bussiere via Boatanchors 
> ><boatanchors at mailman.qth.net>
> >Sent: Jun 6, 2014 3:43 PM
> >To: boatanchors at mailman.qth.net
> >Subject: [Boatanchors] Drake cable question
> >
> >I finally found a 'rough' but complete T-4XB transmitter 
> >to go with my beloved R-4Bs.
> >I have a lot of Drakes and the CDs, etc.
> >
> >Just wondering about the cables to connect the xmitter 
> >and rec. I know that RG-62 is 'recommended', and I 
> >actually may have some, In fact, I'm sure I do.
> >However, just wondering why that 93 ohm cable was picked. 
> >Was it a matter of capacitance/foot, loss, resonance, 
> >what?
> >That was a LONG time ago, and I have lots of the new 
> >low-loss RG-6, RG-59, RG-58. For such a small length, I'm 
> >wondering how much difference it makes on HF....
> >
> >Just an old timer trying to learn.........
> >
> >ron
> >N4UE
>
>     I double checked the handbook for both RX and TX and 
> see nothing about recommended cable.  I use good quality 
> hi-fi cables on my twins and they seem to work fine.  I 
> have some memory that the injection cable should have 
> relatively low capacitance but have not had any trouble 
> the plain hi-fi hook up cables.  I am not sure if Garey 
> Barrell, the maven from the Drake list monitors this list 
> but if so I will defer to his opinion on this.
>
>
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