Richard -
Two different discussions under one Subject..... :-)
These were referring to the alignment of the Injection Couplers in the
TR-4. They're double-tuned circuits, and the manual recommends an
"Alignment Load" of a 1000 ohm resistor in series with a 0.005 uF cap,
used to "detune" the opposite section. Seems like many have come to the
same conclusion that I have, that it's just not necessary given a few
iterations of the two adjustments.
The Calibrator problem was the OP didn't have a receiver to cover 10 MHz.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
<www.k4oah.com>
Richard Knoppow wrote:
----- Original Message ----- From: "Garey Barrell" <[email protected]>
To: "Gary Poland" <[email protected]>
Cc: "drakelist" <[email protected]>
Sent: Thursday, February 25, 2010 8:09 PM
Subject: Re: [Drakelist] Crystal Calibrator Alignment TR-4
Gary -
That's good to hear! I've had the same opinion for years, but I hate
to tell someone to ignore the "factory" procedure. Kinda sets a bad
example...... :-)
I've seen it in other procedures, other than Drake gear, but I've
found that with two-three-four iterations I come out the same.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
<www.k4oah.com>
Gary Poland wrote:
For the record I used the cap/resistor load on the first two or
three TR-4's I aligned and forgot it after that, it didnt make a bit
of difference I could see and after a few cracks, pops, sparks, and
ozone I felt it wasnt worth it. A tech at Drake once told me the
same, dont worry about using the load.
73, Gary W8PU
http://home.roadrunner.com/~w8pu <http://home.roadrunner.com/%7Ew8pu>
I must be missing something. At least on the R-4B and C the
calibrator is connected directly to the antenna jack. All one has to
do is to hang a bit of wire on the jack and use a general coverage
receiver to zero-beat the calibrator wtih WWV or an accurate local
source.
--
Richard Knoppow
Los Angeles
WB6KBL
[email protected]
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