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6 votes
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Is the ground on the back of the Icom IC-7300 an electrical or RF ground?

It's all of the above: an RF ground a 12 V power ground a lightning ground, for what it's worth a chassis ground to prevent "buzz" on the chassis if your shack 0V is not earthed The manual says to ...
tomnexus's user avatar
  • 11.4k
4 votes
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After upgrading the firmware on my IC-7300, there's a new preset in a language I can't understand, what is it?

It says 通常 ("tsūjō" or "tsuujou"), which means "ordinary" or "normal". As for why it's showing up on yours, I'm guessing something funny happened in the update ...
hobbs - KC2G's user avatar
  • 12.5k
3 votes
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Can I splice a random wire antenna?

A spliced joint makes very little difference to an HF antenna electrically, but if you do solder it then you should protect the solder joint from the weather, because the solder will corrode faster ...
rclocher3's user avatar
  • 9,242
2 votes

How do I set the spectrum scope gain on the Icom IC-7300?

To access "Spectrum Scope" Settings Menu : (press and hold) EXPD / SET. The manual entry on this page is on page 71 (https://www.manualslib.com/manual/...
Paul Brennan's user avatar
2 votes

Is the ground on the back of the Icom IC-7300 an electrical or RF ground?

It's merely a bolt through the case. Under normal operation it shouldn't carry any current, so insofar as grounds come in neatly categorized "kinds", I'd say it's for safety. It is not part of the RF ...
Phil Frost - W8II's user avatar
2 votes

What did I just do to my rig? Audio went crazy and had to reboot

I think it's highly doubtful you could break anything by turning those knobs. At worst, you just end up with horrible clipping and distortion as you experienced. The IC-7300 is a direct-sampling SDR. ...
Phil Frost - W8II's user avatar
2 votes

Can I splice a random wire antenna?

Ham radio is about experimenting, Wire antennas are relatively cheap to make. Go ahead and try it and see how well it works. I am not sating you should not read about various antennas and ask other ...
Jim's user avatar
  • 1,778
2 votes

Can I splice a random wire antenna?

Splicing the wire is just fine electrically, but if you're using multistranded cable you probably won't want to solder it. Soldering makes a stiff section which concentrates the stress at the joint, ...
Phil Frost - W8II's user avatar
2 votes

SWR of 1.5 -- use internal antenna tuner or not?

If it is convenient to reduce the swr by fixing the antenna, that would be a more effective solution. But, as you say, 1.5 is not that bad, and likely you would like to continue using the antenna in ...
user10489's user avatar
  • 6,485
2 votes
Accepted

Why is IC-7300 transmitting at zero power in "Rig" split mode with WSJT-X and FT8?

Short version of the answer: VFO B was USB, not USB-D. After manually changing VFO B to USB-D it worked. Longer version: I went back to testing this again and finally noticed that the mode indicator ...
QuantumMechanic's user avatar
1 vote

IC7300 soundcard issues

Concerning how the Windows may connect the inputs ("Recording" channels) and the outputs ("Playback" channels), there are some ways you can hear the input channels in the output ...
ha3flt's user avatar
  • 111
1 vote

IC-7300 internal tuner failing when before tuning I have a 1.5:1 SWR?

It may be only tuning when deemed necessary. The tune light may light up only while the inductors/capacitors are actually in use. The 1.5:1 SWR might not be deemed dangerous by the algorithm inside ...
AI7OW's user avatar
  • 324
1 vote

Can I splice a random wire antenna?

Yes, you can. If you want it to stand up physically for a long time, you should Make a good, strong splice. To make a "lineman splice" you strip several inches of each wire, overlap them, and closely ...
hobbs - KC2G's user avatar
  • 12.5k
1 vote

Is an Icom radio’s model ID info available via a CI-V command?

ICOM uses "other" CI-V commands to interrogate the radio. If you have any of the radios which use their "Cloning Software" you will notice that there is an "Information" ...
guitarpicva's user avatar
1 vote

SWR of 1.5 -- use internal antenna tuner or not?

If you do not use the tuner, you are getting some power (another answer here says around 4%) reflected back into the final stage of the power amplifier (PA) of the radio. This will cause the final ...
Scott Earle's user avatar
  • 4,619
1 vote
Accepted

SWR of 1.5 -- use internal antenna tuner or not?

For transmit, compared to a perfect SWR of 1:1, an SWR of 1.5:1 will give about 4 % loss of power radiated by the antenna due to reflections at the antenna / feed line junction. All other things equal,...
Andrew's user avatar
  • 3,693
1 vote

Icom 7300 low frequency broad-spectrum noise

I've had similar noise multiple times - I've had three sources. One was a light dimmer in another room. Another was the charging circuit in a UPS under the radio bench. The third was a seemingly ...
John's user avatar
  • 156
1 vote

Is the ground on the back of the Icom IC-7300 an electrical or RF ground?

It is primarily an RF ground. Connecting that to an earth ground can invite damage from a lightning strike. See http://w8ji.com/station_ground.htm. I used to have lots of annoying audio and CW feed ...
Mike Waters's user avatar
  • 8,071

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