In the front is a 43 ft wire vertical hanging in a pine tree
and this is my remote tuner, a MFJ 929 auto tuner fed with T bias 12 V on the coax in a 50 cal ammo can.
I use this antenna primarily as a receive antenna on 160 80 40 and 30 since I can tune it from the shack. I can also cut the 12 v to get a broadband response by bypassing the tuner.
The 43 ft antenna was chosen for the Flex 6300 and the tuner was bypassed.
I ran the K-1 up to 0.2 watts and here is its spectra as seen on the 6300
Note the transmitted signal is about -40 dBm or about 33 over S9. It is here I loose the spitting (spurs) from the K-1 and I could easily carry on a contact with a station at -120 dBm (s1) The transmitted signal K-1 is 9 khz away.
I tuned up the band a bit further and at 20 khz up the band from the K-1 transmitter I can no longer hear the first hint there is a 33 over signal being transmitted 175 ft from my rx antenna.
Here is a shot of me listening to a station who is -117 dBm only 6 khz up from my K-1. He is 100% Q5 copy.
I had to go do a couple of operations to pay for my kids college so I didn't get to the second part of this rest till I got home. I had been scheming ways to get a stronger signal into my 6300's un-preselected front end. I cranked up the power to 7 W on the K-1.
As you can see the spectra is far dirtier. Note the signal is about -20 dBm or about 53 over s9. I put the K-1 through my alpha and got this
Same spectra but the signal in the 6300 is now about -5 dBm Now I'm up to 68 over S9 and this represents 40 W of transmitted power from the K-1 The band was dead so I looked for the first station that was tweaking my panadaptor
It was a SSB station about 100 khz up the band His strength was about -100 dbm or S4
I hit the key on the K-1 and was still able to copy him Q5, His signal was totally unaffected. I could not tell my K-1 was transmitting even though I was sending 50 w of CW on an antenna 175 ft from my rx antenna.
That's about as drastic of a test as I can muster right now. It none the less is I think a pretty amazing test. All of the RF from 30 khz to 54 mhz including a signal 68 over S9 only 100 khz up the band on SSB no less and the rx is bullet proof. Eventually I will get another rig on the bench capable of driving the alpha to 1500w. If I was at a 100 w class field day site: on 40 M I could easily work S1 stations on CW with a SSB station 150 khz up the band and as long as his TX was clean and I wasn't on a spur, no problemo. Given enough power I'm sure I could crush the front end BUT the loudest station I ever hear is Radio Havana on 6 mhz and the loudest I've ever heard them is - 37 dBm or s9 plus 37. This test gives a real world example of how the radio works
Not bad for a radio that ain't got no front end much less a friggin' roofin' filter!!
73 W9OY
Someone on eham didn't believe my band noise on 160 so I thought I would include a shot for the record. Look at the dBm reading in the flag. My antenna is a 66 ft resonant vertical.
