Using another radio as a monitor...BUT...

[45 North Florida]

So this is probably simpler than I think, but it has always had me stumped. My Yaesu FTDX-10 is the transmitter in this situation, hooked to a dummy load...my Icom 7300 is the receiver/monitor, as I'm setting the eq in the Yaesu. Even with the Yaesu turned all the way down to 5 watts, and only an s8-s9 signal on the 7300, the audio sounds horribly distorted. I can take my 7300 out into my field 100 yards away on my side by side and have my wife give me some audio, or have her play a recorded test message, and it's as clean as a whistle, just by getting out of the house with the 7300. Is it RF from the dummy load possibly? Even transmitting on my vertical 60' up the tower sounds bad with the 7300 right beside me, or even in another room of the house. Am I still over loading the front end of the 7300 even though it only has an s8 signal from the Yaesu?

 

[Crawdad]

Had a similar issue with Xmit on FT-710, RX on IC-718 til I backed the RF Gain way back on the 718 (which is for sale BTW).

 

[sp5it]

What is AGC setting on 7300?
I was listening myself a lot of times on 7610 which is almost the same regarding front end and it was clear.
Mike

 

[45 North Florida]

What is AGC setting on 7300?
I was listening myself a lot of times on 7610 which is almost the same regarding front end and it was clear.
Mike

I've actually tried all speeds/settings for AGC and it's still a little wonky sounding while in the house.

 

[brandon7861]

Does the receiving radio have anything connected to the antenna jack? If not, connect a dummy load. It doesn't have to be a high power resistor, even a quarter watt resistor should work.

I often have this problem when monitoring on a second CB. If I had to guess, I think the pre-select LC filter rings too hard when there is no load connected to the radio. Again, that's just my guess.

 

[45 North Florida]

Does the receiving radio have anything connected to the antenna jack? If not, connect a dummy load. It doesn't have to be a high power resistor, even a quarter watt resistor should work.

I often have this problem when monitoring on a second CB. If I had to guess, I think the pre-select LC filter rings too hard when there is no load connected to the radio. Again, that's just my guess.

That sounds like a very good possibility...I'll try that tonight.

 

[nomadradio]

We have a similar problem with base station radios. When they transmit into a properly-shielded dummy load, the strongest signal in the room radiates from the radio's AC line cord. Tends to impose an AC hum on the modulation. Got in the habit of putting a coax jumper on the monitor radio and placing it inside the wattmeter. Eliminates the power-cord hum.

Makes me wonder if this has something to do with your issue. Distortion from front-end overload should not be an issue with a receiver that new and sophisticated.

Or maybe I'm overthinking this?

73

 

[Mustang 131]

It might takes some trial and error testing, but you'll get it to work.
I've used separate receivers for 30+ years specially to hear exactly how I sound on the air.
(SDR's will give you headache do to the latency)
Try to keep the transmitter and transmitting coax as far away as possible from reciever..
Isolate the receivers power supply from your xmitter...a UPS works wonders.
And finally the further the gooder the antenna..
but to be frank I've run 10,000's on a groundplane 40' on top of me. And it still works. That might take a little more time tho.