Yep, totally true. Same problem/effect as when someone uses way more
power than needed on a satellite transponder. Just be careful of your
ears. At 2.7 KHz [widest roofer I have], I never encountered a really
strong signal in the passband that I could hear, in the fairly short
time I was using JT-65. One approach from "way back in radio" is to
wear your headphones somewhat forward on your head when in these AGC-off
modes. CONFIG:AF LIM ON is also a really good idea.
73,
Fred K6DGW
- Sparks NV DM09dn
- Northern California Contest Club
- CU in the Cal QSO Party 7-8 Oct 2017
- www.cqp.org
On 11/27/2016 5:47 PM, Bob wrote:
Well, everyone is different I suppose, but I believe the intent of
WSJT-X and the JT65/JT9 modes is to open your RX filter wide, to 4 KHz.
That lets you see every JT65 AND JT9 signal in the bandpass. If you
narrow down the filter you will miss many of the signals.
Because of the wide bandwidth, you really need to turn your AGC OFF.
This will prevent a strong signal somewhere in the passband from
suppressing the RX gain to the point that weak signals are missed. Turn
your RF gain fully CCW, then turn the AGC OFF. Then advance the RX gain
until you see about "30" on the WSJT-x meter (left side - per the
manual). I drive my interface off the line output, so the AF setting in
not material.
When done this way, it is very common to decode 20 or more signals per
pass on 20 meters. And it is fairly easy to have DXCC within a couple
of weeks, especially if you use JT-Alert too.
Good luck!
Bob, WB4SON
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