Signal overload?

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G0DJA
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Last seen: 4 years 1 month ago
Joined: 2008/04/20 - 16:42
Signal overload?

I'm starting to see a situation where strong signals appear to be causing overloading of the receiver.

On 60M at the moment there are some very strong stations which, if I don't back off the RF gain a bit, show up twice in the same transmission period, the two decodes being 100Hz apart. As per decodes shown below.

1518 8 -0.5 5.288663 0 G0HNW IO93 37
1518 -25 -0.6 5.288762 0 G0HNW IO93 37

1526 7 -0.4 5.288662 0 G0HNW IO93 37
1526 -24 -0.3 5.288762 0 G0HNW IO93 37

1532 -3 -0.1 5.288636 0 G3YSX IO91 37
1532 -27 -0.2 5.288737 0 G3YSX IO91 37

1542 -5 -0.5 5.288616 0 G4MD IO82 30
1542 -3 -0.4 5.288636 0 G3YSX IO91 37
1542 -28 -0.5 5.288716 0 G4MD IO82 30
1542 -27 -0.4 5.288736 0 G3YSX IO91 37

At this point I backed off the RF gain and the decodes were a lot cleaner.

1546 -13 -0.4 5.288787 0 LA3JJ JO59 37
1548 -6 0.2 5.288693 0 G4WGE IO91 37
1550 -4 -0.3 5.288636 0 G3YSX IO91 37
1550 -4 1.4 5.288676 0 G3ZPD IO84 37
1552 -2 -0.6 5.288627 0 G0PPM IO81 37
1552 2 -0.5 5.288663 0 G0HNW IO93 37
1552 -4 -0.5 5.288787 0 LA3JJ JO59 37
1554 -27 -0.4 5.288616 0 G4MD IO82 30
1554 -27 -0.5 5.288646 0 G4CAO IO91 23
1558 -5 1.5 5.288677 0 G3ZPD IO84 37
1558 -5 -0.4 5.288787 0 LA3JJ JO59 37
1600 6 -0.5 5.288627 0 G0PPM IO81 37
1600 -1 -0.4 5.288663 0 G0HNW IO93 37
1602 -2 -0.4 5.288636 0 G3YSX IO91 37
1604 -27 -0.3 5.288646 0 G4CAO IO91 23
1606 -12 -0.2 5.288663 0 G0HNW IO93 37
1606 -7 0.3 5.288693 0 G4WGE IO91 37
1606 -28 -0.1 5.288729 0 G0KTN IO81 23
1606 -15 -0.4 5.288787 0 LA3JJ JO59 37
1608 5 -0.6 5.288627 0 G0PPM IO81 37
1610 -9 -0.4 5.288646 0 G4CAO IO91 37
1612 -3 0.1 5.288636 0 G3YSX IO91 37
1612 -16 -0.3 5.288786 0 LA3JJ JO59 37
1614 -12 -0.6 5.288646 0 G4CAO IO91 37
1614 -18 -0.4 5.288662 0 G0HNW IO93 37
1616 -26 -0.5 5.288630 0 G0PPM IO81 33
1622 -20 -0.4 5.288662 0 G0HNW IO93 37
1622 -6 -0.5 5.288787 0 LA3JJ JO59 37
1628 -27 -0.4 5.288620 0 G0PPM IO81 33
1632 -20 -0.2 5.288662 0 G0HNW IO93 37
1632 -26 -0.3 5.288752 0 TF3HZ HP94 30
1632 -3 -0.5 5.288787 0 LA3JJ JO59 37

So I slowly increased the RF gain until this happened.

1638 -25 -0.4 5.288688 0 LA3JJ JO59 37
1638 1 -0.5 5.288787 0 LA3JJ JO59 37

This is the first time I've seen this effect using WSPR.