[Boatanchors] DX-100

[James M. Walker]

Howdy folks,
Since I use several of the DX-100 units here, I thought I would chime in. 
So,
per the manual, select an empty crystal position, with the transmitter into 
a dummy
load or antenna, go to operate position, and adjust the clamper pot until 
the plate
current goes to zero then stop. Return the rig to standby. When you transmit 
into
a dummy load, I usually adjust the rig for 300 Ma of plate current, and 6 
Ma. of
grid current. Which is theoretically 3 Ma. per tube. My measured output into 
a
50 ohm load is 135 watts. Also the AC input is set at 115 VAC with a 20 amp
0 - 130 VAC Variac. The transformers live longer if the input voltage is NOT
exceeded. I run one "barefoot" on AM/CW and a different rig is a driver for
a single 4-1000A, class B amplifier, both work great. As usual YMMV.
Jim
WB2FCN

----- Original Message ----- 
From: "Bob Young" <youngbob53 at msn.com>
To: <heathkit at mailman.qth.net>; <boatanchors at mailman.qth.net>; 
<rharrington at killingly.k12.ct.us>
Sent: Wednesday, April 18, 2007 8:47 PM
Subject: [Boatanchors] DX-100


> Two questions:
>
> Some of you probably remember I bought a DX-100 and fired it up a few 
> months ago and couldn't get more than about 100 ma of plate current, and I 
> couldn't set the clamp control because nothing registered on the meter 
> when I put it to an empty crystal position (stayed below 0 plate current). 
> Someone mentioned setting it with the transmitter in operation (Glen Zook 
> I think and probably others). I hooked it up to a Marconi 100 watt dummy 
> load-wattmeter and was getting about 56 watts max. with my usual 100 ma. I 
> then turned the clamp control clockwise and the plate current advanced, I 
> stopped at about 250 ma and the Marconi meter was pegged, in fact this was 
> on pos #8 it was still putting out about 100 watts on 6 I think.
>
> My first question is, is this a good way to set this control, in other 
> words is it set close enough or should I check it some other way? When I 
> got to about 250 ma it seemed to stop advancing or at least at the same 
> rate it had been.
>
> Also the Marconi is a TF1020A/1 and when I bought it it was advertised as 
> a 75 ohm load, on the front it says 50 ohms and also measure 50 ohms on a 
> multimeter, is anyone familiar with this unit?
>
> Bob Young
> KB1OKL
>
>
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