From: Garey Barrell 
Subject: Re: [drakelist] Drake cables info


Pietro -

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

Pietro Lapiana wrote:
> Hi net,
> anybody in this extremely interesting net knows the characteristics of the
> Drake cables used between r4 series and t4series especially for the
> injection one that looks to be the more critical one?
> I suppose that it could be replaced with a RG59 video cables with dual RCA
> jacks used for video signal today. I suppose that also the other cables
> could be replaced with the current audio shielded cables.
> I am telling "horrible things"?
> 
> Tnx in advance
> by
> IOKPL, Pietro
> 
> 

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