[ARC5] T-19 Real World Antenna Matching Problem

[Mark K3MSB]

Hi Dave --

Common ground between the transmitter and power supply via the HB
interconnect cable.

Can't ground the analyzer when making the measurement;  I remove the PL-259
from the WV-4 and plug it into the analyzer, verify flat 50 ohm SWR at
3.550 MHz, then plug the PL-259 back into the WV-4 wattmeter.

Yes, same feed line and feed point.

The coax shield is floating though, it's not connected to the chassis.

OK on your photos Dave.  I don't have any toroids available though.
However,  sometime in the past I picked up an multi-tap UNUN, and it's
around here somewhere, and it will do 12 to 50 ohms.   I don't know why I
didn't remember that until now.  I'm going to hunt for it.....

73 Mark K3MSB

On Sat, Dec 29, 2012 at 8:36 PM, David Stinson <arc5 at ix.netcom.com> wrote:

>
> ----- Original Message ----- From: "Mark K3MSB" <mark.k3msb at gmail.com>
>
>
>  This is what has me stumped.  If my analyzer is showing a proper match
>> with
>> 50 ohms impedance, I should see no difference when changing from the dummy
>> load to the antenna, or a minimal change at best.   I'm seeing a radical
>> change.
>>
>
> How is your chassis and power supply grounding?
> Is the analyzer sharing the same ground as or grounded to
> the transmitter chassis when making the measurement?
> Same feedline and feed point?
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