From: Garey Barrell 
Subject: Re: [drakelist] B-line cables ?


Garey Barrell  made an utterence to the drakelist gang
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Jim -


The original Drake supplied cables were all standard "microphone" 
shielded wire, with the exception of the "INJ" cable.  All but the INJ 
cable were similar to what is used in audio patch cables today.

All cables were 38" long tip-to-tip.

The INJ cable used a foam inner dielectric and phono connectors with a 
white insulation.  This cable measures 60 pF total capacity.

All other cables used the standard for the day clear polyethelene inner 
dielectric and phenolic (brown) insulated phono connectors and measures 
~100 pF.

Original Drake INJ Cable = 19 pF/ft = .160" o.d. (foam poly)

RG-62 = 93R = 13.5 pF/ft = 0.240" o.d.
RG-59 = 75R = 14.8 pF/ft = 0.242" o.d.
RG-6 = 75R = 16.2 pF/ft = 0.270" o.d.
RG-174= 50R = 30.8 pF/ft = 0.110" o.d.
Mic Cable (Belden 8410) = Hi-Z = 33 pf/ft = 0.160" o.d. (foam poly)
Mic Cable (Belden 8421) = Hi-Z = 16 pf/ft = 0.180" o.d. (foam poly)
R/S Audio Patch Cable = 28 pF/ft = 0.165" o.d. (poly)

The best choice is the Belden 8421 Audio cable from their "Brilliance" 
line.  It looks just like the other cables, and is very flexible.  The 
RG-62 is OK, but it is 50% larger and far less flexible.  RG-62 is also 
prone to shorting if bent over too small a radius.  The only pertinent 
factor is the total capacity, impedance and "loss" are not important.

Actually the standard R/S audio patch cable will work ok in the INJ role 
as long as the Injection alignment is done with the R-4 and T-4X cabled 
together.

The C-Line can use the same cables, except there are two cables (INJ and 
CAR OSC) that need to be low capacity.  The ANT lead should probably be 
RG-58 coax, but it's really not long enough to be significant.

73, Garey - K4OAH
Atlanta

Drake C-Line Service Manual
http://hr99.home.mindspring.com/R-4C_Servicez/>



Abqcooks{at}aol.com wrote:

>Abqcooks{at}aol.com made an utterence to the drakelist gang
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>I know this has been covered before but I cant seem to find it.
>On the interconnect cables for the B Twins is the 'inj' cable
>supposed to be rg-62 ?  rg-62 is what I have in my fuzzy organic memory.
>I also assume that the RF (antenna) connect between the Twins
>should be 50 ohm coax instead of the twin lead phono plug 
>cable that I found it with ?
>Also, what is the current Drake Net time and freq ? 
>Thanks .... NM is a very rainy desert today. jim  N5KY
>
>  
>
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