Hi Jim:
You may want to try and add bandpass filters to the
antenna lines, also add a coax balun, (a 8 to 10 turn coil of RG8U coax
or similar, do not use foam filled coax though). this is wound on a 4 to 6
inch diameter
plastic pipe, placed in each antenna lead close to the transmitter.
Look at http://www.qth.com/dunestar/filters.htm
Ed 73 K7DXV
----- Original Message -----
From: "Jim Reid" <jimr.reid@verizon.net>
To: <tentec@contesting.com>
Sent: Sunday, September 02, 2001 1:09 PM
Subject: [TenTec] Simultaneous Keying Question
> Hi,
>
> I am now keying three TT rigs simultaneously; an Omni VI+,
> on either 20 or 15 meters feeding a C3; a Triton IV (544)
> on 40 feeding a F12 rotating dipole mounted on the SAME
> boom with the C3, and a Corsair II operating on either 30
> or 17 meters feeding a doublet wire inverted V, the apex of
> which is about 10 or so feet below the boom holding the C3
> tribander and 40 dipole (F12 C4 set up).
>
> Purpose is putting out CW practice on three bands at the
> same time (similar to W1AW). Now what I am seeing and
> possible problems. I presume each rig is transmitting within
> very few milliseconds of one another as the same keying
> signal goes to each. All seems to be operating as intended,
> I have gotten good reports from across most of the US
> mainland.
>
> What I see: the S/vswr meter on the Triton moves significantly
> on transmit. It should not, the vswr on it's transmission line is
> 1.1:1; and it if is keyed independently, the meter needle
> moves not a whit. But if the Omni is keyed on 15 meters at
> the same time (remember both radiators are on the same boom)
> the Triton S meter jumps to a couple points, so the Triton rcvr is
> "hearing" the Omni signal, I presume. If only the Triton and
> Corsair are keyed (Corsair on 17 meters, say), the Triton
> S-meter does NOT move a bit.
>
> Second, I notice after the rigs have been keying away for
> an hour or so, the digital readout on the Corsair begins to
> behave erratically -- indicated frequency jumps up a kHz or
> so occasionally, again when the Omni is keyed along with
> it. This does not occur on initial turn on for awhile. Is
> the Corsair actually changing the transmitted frequency,
> or is this indicator instability?
>
> I will be doing this again today at 2200 and 0030 UTC in
> about 3 hours and 5 1/2 hours from now. Would appreciate
> any signal reports on what you might hear at 18097.5 kHz
> and 21067.5 kHz. Doubt if the 7047.5 signal will be
> heard on the mainland at either time; it is for KH6 land
> practice.
>
> Thanks in advance for reports or thoughts on this situation.
>
> 73, Jim KH7M
>
>
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