Anyone else have this rig? I started with the 705 and added this for my base. I have a question on 80m interference that I didnt see on my 705.
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ICOM 7300
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I have had one since before covid, what kind of interference are you getting? are you powering the radio from a different PSU? some switchers have RFI problems.
ETA: does the interference follow a pattern? like every X khz? sometimes you can use that to narrow down what might be causing it.
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Cross spectrum. Only happens on 80m, I never saw this on any band with the 705. I may connect the 705 again tonight to see if it's showing now.
I am using this power supply. MFJ MFJ-4230MVP MFJ 4230MVP MightyLite 30 Amp Switching Power Supplies | DX Engineering
These shoot across the entire spectrum pretty regularly. I assuming it's something in the house causing it, if so does anyone know how I find it?
ToddDubya
NES Member
When you say "these shoot across the spectrum" do you mean like they sweep across? If they do, I think those are chirps used to test propagation. That doesn't explain why you'd see them on one radio and not another though, and only on 80m.
I literally took out my 705 and put in my new 7300. Same antenna. The 7300 is powered by the MFJ, the 705 was powered by the ICOM power supply that looks like it was for a laptop.
Mike, I wouldn't say it's regular intervals, but its frequent, I dont think I can go more than 5 seconds or so without seeing a full line of noise across the spectrum.
I've seen those once in a while, these fill the spectrum, shoot or sweep it was probably the wrong choice of words because I know what you're talking about.
yes
Im going to hook back up the 705 tonight and see if I can replicate this on 80m. I'll also try running the 7300 on a battery to try and rule out the power supply.
Good to know. It has to be something in the house. It's odd I never saw it with the 705, I'll find out tonight when I swap them.
one-eyed Jack
Manufacturer
I once had a problem with a fish tank with a heater in it. Jack W1FKG.
ToddDubya
NES Member
Time intervals or frequency intervals?
Are you talking about static crashes? May even "kill" your audio while the AGC catches up?
ToddDubya
NES Member
Just did some image searches.
I get this kind of noise, although primarily on 15m, where it's every x KHz.
And this is a big static crash across the whole band (and then some). These seem worse on lower bands.
I couldn't find a picture of the propagation scan chirp, but it looks like someone was tuning up while sweeping the VFO quickly across the band.
I get this kind of noise, although primarily on 15m, where it's every x KHz.
And this is a big static crash across the whole band (and then some). These seem worse on lower bands.
I couldn't find a picture of the propagation scan chirp, but it looks like someone was tuning up while sweeping the VFO quickly across the band.
still working on reducing the b.s. in the house for the 7300. I found out the nice little lamp I have on my desk creates a lot of noise. It sucks because I liked it alot. ![[smile]](/xen/styles/default/xenforo/smilies.vb/001.gif "Smile [smile]")
Still have some offenders but until the house is empty and I can cut the power it will take some time to square it all away.
Still have some offenders but until the house is empty and I can cut the power it will take some time to square it all away.
At least the noise is local which allows you to fix it. It's a different story if some a**h*** with cheap chinese pot grow lamps that leak RFI is two houses down from you and they don't care, lol.....still working on reducing the b.s. in the house for the 7300. I found out the nice little lap I have on my desk creates a lot of noise. It sucks because I liked it alot.
Still have some offenders but until the house is empty and I can cut the power it will take some time to square it all away.
Hopefully I dont find that. Its fine during the day on 80m. I was on it a lot today testing winlink. Something is happening at night.
still working on reducing the b.s. in the house for the 7300. I found out the nice little lamp I have on my desk creates a lot of noise. It sucks because I liked it alot.
Still have some offenders but until the house is empty and I can cut the power it will take some time to square it all away.
Hook the radio up to your power pack and flip the breaker. Then you will know if it house related.
CHA EMCOMM III BASE
The EMCOMM III Base antenna, is an effective multi-band High Frequency (HF) antenna specially designed for short to long range base station HF communications. Due to configuration and installation flexibility and low visibility design, it is ideal for home use even in developments with a Home...
chameleonantenna.com
11' off the ground, straight from the house out to my range.
Cool, thank you. I have been considering their MPAS 2.0 kit as well.CHA EMCOMM III BASE
The EMCOMM III Base antenna, is an effective multi-band High Frequency (HF) antenna specially designed for short to long range base station HF communications. Due to configuration and installation flexibility and low visibility design, it is ideal for home use even in developments with a Home...
11' off the ground, straight from the house out to my range.
fshalor
NES Member
Make sure you're in bypass mode... I never got the tuner to work for me on my g5-rv or 80m dipole (homebrew flavor)
Worked very well on a new MFJ versatune. (Can't remember which model number, but around $220 from HRO)
I *do* run mine setup for PSK31 almost exclusively. So some of my noise/notch/filter settings are geared for digital.
