From: Garey Barrell 
Subject: Re: [drakelist] R4 and T4X injection issue, transceiving


Ken -

If you have the "low capacity" INJ cable, (all that I 
have seen have white insulators in the RCA jacks,) they 
should show only minimal drop-off between "Separate" 
and transceive either way.

Two things.  Have you tried doing the injection trimmer 
alignment with them cabled together.  The procedure in 
the manual is an attempt to "compensate" for the cable, 
assuming you don't have the "other" unit.

When switching to transceive with the early units, and 
some later ones, you may have to repeak the Preselector 
and RF Tune controls slightly for maximum 
sensitivity/output.

If you have the capability to measure the capacitance 
of your INJ cable, it should measure less than 60 pF as 
opposed to the typical 100-110 pF of a standard audio 
patch cable.

73, Garey - K4OAH
Atlanta

Ken Sands wrote:
> Hello again my fellow Drake mavens,
> One final issue concerning operation of my "new" twins (R4 and T4X) 
> using the "regulation" Drake RCA
> "injection" jumper.... I cannot get the R4 to be up to snuff in
> sensitivity (down almost 4 "S" units) when selected to Xmtr
for frequency
> control (I have tweaked up the injection trimmers according to the
> manual)
> and the T4X drops to 60% power when transceiving off the R4 VFO ( I
> tweaked the T4X too).They both work normally off their own VFO/injection
> circuits!....any ideas you wizened old guys???
> 73, Ken K8TFD
> Ken Sands
> Audio/Video Engineer
> ken.sands{at}juno.com
> 734-453-7658
> 734-564-0316 cell
> 

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