>
> Hi gang,
>
> I am back with an observation and another source of wonderment.
>
> If I set my antenna coupler for minimum SWR (Drake MN75) I use a
> certain setting to effect this. If I use my antenna noise bridge
> set for X = 0 R = 50 ohms, I get a slightly different setting on
> the MN75. Could it be the output impedance of the xmitter is
> slightly different from 50 ohms? It leads me to wonder which
> tune-up procedure to use. I seem to trust the noise bridge
> setting as I get out like I am running 100 watts. If I can hear
> them, I can work them. Just curious. Us qrpers need to pursue
> all electrical phenomena and explore all possibilities because we
> refuse to make up for slop with power.
>
> de vic ad8k . .
>
Vic:
There will always be a certain amount of variation in your measurements,
due to component tolerances, calibration accuracy, design flaws, etc.
Don't sweat any differences between the settings, unless you're seeing
*grossly* different measurements. Besides, as Walt Maxwell shows us
in _Reflections_, minor ( even major, for that matter ) variation in SWR
usually don't make a measurable difference on the receiving end, anyhow.
- Rich
[
QRP-L Archive |
]
[
1993 |
1994 |
1995 |
1996 |
1997 |
1998 |
1999 |
2000
]