For most of us, learning to identify and mitigate RFI and EMI "noise" is probably only second to understanding antenna systems. Some operators just get use to it. Some try to understand it and resolve it the best they can. It's one aspect of Amateur Radio that new hams are often surprised or dissapointed by. Thanks for the video !
and i still managed to order BNC to PL259 rather htan RCA to PL259 :( its a bit hard to make out from this video as they look like coax cables just coming out of the RX7300 and i assumed they was BNC not RCA. Still, amazon to the rescue :)
i have moved my main antenna from a vertical to an end-fed 80m and now pick up more noise than before. I have the MFJ-1026 and the IC-7300, so i really enjoyed your clear explanation of how this all works, i've used the MFJ-1026 on my Kenwood before and it worked well with my vertical, but will look foward to trying it out with the way you have your setup on the IC-7300 where I am picking up a lot of interference from VDSL which is transmitted on the telephone wires here in the UK. Will post a video on my channel once its all setup, more people in the UK need to know how to do this as VDSL is really impacting amateur radio where DSL is delivered over copper telephone lines.
Nice video but would of been nice to see a signal come in in the 160 Meter band that you could not otherwise hear without the MFJ-1026. As it is the video makes it look like all signals were canceled out. I read on another forum that some people use external selectable LPF's BPF's using that same Inrad cable to help the 7300 keep out QRM n all bands. Have you any experience with those?
You need 2 antennas for receiving. One being your main receiving antenna, usually also your transmit antenna and the other being the noise receiving antenna. So the answer is yes and no but. ..... IOW... If you are using the efhw for rx and tx then you still need another antenna to feed in the noise. This is call the "n o i s e" antenna. It needs to do a good job of picking up the noise but a lousy job of picking up the desired signal. the 1026 takes that big noise signal, adjust the phase and level then blends it with the noise on the main antenna so as to cancel only the noise and not the desired signal. Hope this makes sense.
Hi Steve, Many thanks for this video, i'm in the process of building this out as the components arrive - can i ask how you have got your end-fed long-wires setup ? Do you have one North/South and the other East/West or do you run them the same polarization ? I going to experiment as my power levels are limited to 50W currently, but I'm looking forward to see how this works out.
Unfortunately my highest noise receiving antenna is also my best transmitting antenna, which is on my "main" port. I've tried numerous other dedicated noise antennas on the aux side in every shape and size but the main antenna always picks up far more noise and I can't get good cancelling. Very frustrating.
Hi, Steve! Thanks for this wonderful IDEA (video) using the Rx7300 and so not connect the TX output of Icom7300 directly to the MfJ-1026. Question - If I can still access the plastic connector (set aside for the Rx7300 at rear), can I still connect say the AH-4 tuner to the Icom 7300? As I understand, the TX line is completely independent from the Rx7300... The RG5000 is a MUST (this is similar to RG5000HD, I guess). So I will have the Rx7300, the MFJ-1026, the RG5000 and then the AH-4 tuner all at the same time? 73s Gerry DU7EYG
Hi Gerry Yes you can use the tuner jack as you stated. I saw where one guy even cut the notch in the 7300 rear panel deep enough to hold both the RX7300 jack and the Molex jack. I might do that myself.
Can anyone tell me what causes the horizontal lines across the waterfall after the powerline noise is gone? I have the exact same thing and with a wider span it becomes clear that the interference is about 5khz wide at about 60khz intervals and appears on most, if not all bands. I have powered down the entire house with no change.
Basically yes. Both antennas are transmit capable however. One can use a single antenna also. The rx7300 can be used to feed the rx signal from the main rig to the slaves rx input assuming both rigs have the rx7300. Lots of neat possibilities.
@@n4lq I figured as soon as I seen it. very quiet even at full speed, and will last quite a while. I built a gaming PC with 7 of them, three of them are 120mm Chromax black, and four of them are their 40mm their brown color. I want to do that with my Astron 30A PSU as it's fan is not what I'd call quiet. The fan on that PSU seems like it's one of those server grade Delta fans that have a very high RPM, and move a lot of air, I'm not sure if Noctua has a fan that small that can move that much air.
Yes if you have the DXE receiver guard in line. The RX antenna will have a strong signal on it. The MFJ 1026 has a light bulb inside for protection but that isn't enough if you are running QRO and that RX noise ant. is near the TX antenna. I also placed back to back diodes across the RX antenna input on the 1026 so we have even more protection. There is a built in TR relay that can be keyed by your key line. This disconnects the RX antenna entirely and provides ultimate protection to the 1026 if you don't mind the relay noise.
