This is especially when HF bandpass filters should be used. Dedicate one radio to 20m, another to 40m, etc. while using the respective filter. I have had no problem using a 7300 with other radios when filters are used with close proximity of the antennas. One could even make stub filters on the cheap, but it was worth the money to me to buy filters. During Field Day, or just out operating with friends, the filters keeps things amicable.
We had filters. The same filters we've used on every other radio there for several years now. We've tried multiple different radios there and the 7300 was the only one that was rendered useless. Substituted a Yaesu 991a and carried on just fine.
I'll have to check with the field day coordinator, I don't recall off hand. We had them for 10,15,20,40 and 80 if I remember the sheet board correctly. Has to mark what band we were on and take the correct filter. I was on voice and the CW station kept killing my receive so we switched radios and I was back in action. I'll check in the morning and get back to you
I can only tell you what our club has experienced, we know what we saw and what happened. Last two years ago we tried one and substituted it with a 991A and that worked much better, this past year we tried again, and decided within an hour to just go ahead and use a FT-710 which honestly was one of the better ones we had tried in multiple years.
Thanks! This is the kind of info needed! I'll get with the owner of the 7300 we were using (we use members radios on FD) and get this to him! Again, thanks!! 73I reworked the receive input of my 7300 and brought the coax from the T/R relay to the rear panel to an SMA IN and OUT where I can install filters and things in the receive path. I have a tiny 160-6m band pass filter that I sometimes put in line that really reduces high level out of band signals and makes my 7300 play at least as nice or better than my 7610 for out of band signals.
I think this is the filter I use but maybe an updated version.
Multi Band Pass Filter HF+6m for HAM Transceiver Receiver | eBay
High quality Multi Band Pass Filter board with 2x SMA connectors. PCB size: 73mm x 55mm. Insertion loss 1dB - 2dB. 2x SMA RF connectors. Input-Output 50 Ohm AC coupled.www.ebay.com
You will need a couple of surplus internal RF cables, I forget what the connectors are called but they are used in many different amateur radios. I bought two cables like this then cut off one end and installed chassis mount SMA connectors with small hex nuts instead of a square flange. I mounted the connectors on upper rear right side when looking at the rear of the radio. You basically unplug the cable from the T/R relay to the receiver and install the two cables with SMA and drill two holes in the back of the radio. You will need a short SMA male to SMA male to jumper the connectors when not using an external filter. I would take a picture of the setup but the radio lives at another place at the moment.
Unfortunately, it's not generally the RF rich environment on HF, rather the solar, Cheap Chinese LEDs, and other consumer devices, which just spew crap everywhere these days. I have a friend who lives in a similar environment, and all the filters in the world wouldn't help. And he's not using a 7300...he's using a Kenwood 590. We tried everything we possibly could. Go to a park a few blocks away (but away from the houses) and everything is fine.
