From: "Gerry" 
Subject: RE: [drakelist] T-4x Alignment


I don't know about the others but the biggest pain for me is checking the
height of the ganged tuning slugs. They have to be set exactly per the
manual and I think the difference between some of them is only about 1/32
inch. Had an old one where the tuning mechanism had slipped a little and I
couldn't tell if the slugs were white or yellow. They looked somewhere in
between. Tried the alignment using the white settings and it didn't work.
Found out they were yellow after all. But it still never worked right on 10
meters. The trimmers were out of range and I couldn't neutralize the finals.
It worked as expected up through 15 but on 10 things fell apart. Turned out
to be the parasitic plate chokes. You wouldn't think it was important but
something must have happened to those 2 watt resistors over time. They went
up in value to about 62 to 68 Ohms. It didn't seem important but replacing
both of the chokes fixed the 10 meter problem. It became apparent when I
used a return loss bridge to check the final tuning circuit.

-----Original Message-----
From: owner-drakelist{at}www.zerobeat.net
[mailto:owner-drakelist{at}www.zerobeat.net] On Behalf Of George KB2Z
Sent: Monday, January 26, 2004 12:48 PM
To: drakelist{at}zerobeat.net
Subject: [drakelist] T-4x Alignment

Hi Again All;

Cleaning the switches appears to have corrected the intermittent tx 
problem, for now.

Not sure if more cleaning will help the output on 20 and 40M?

I was able to tune the rig on 80 thruogh 10M. The output is approx;
80M = 30W
40M = 140W
20M = 25W
15M = 100W
10M = 75W

I want to try aligning it per the manual and wondered if there were any 
hidden land mines to watch out for.

RF and mixer stages instructions 3 to 10 have you peak the inj with a sig
gen.
Steps 11 to 18 have you do the rf with the vfo. During steps 11 to 18 do 
you re-peak the inj with the rf in any particular order?

Can I use the rx to peak the 160M band? I dont have a 160M tx xtal. The rx 
does have a 160 xtal.
Does it matter if I dont peak the 160M band? Dont have an antenna for it 
anyway.
I have not tried the rx & tx as a pair yet. Want to get the tx up to snuff 
first.
I appreciate the help.

Thanks in advance for any suggestions or advice, George KB2Z



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