Re: [IC-7000] Re: RF getting into rig screen shows distortion

Colin Christie

Hi Perry,

I have a choke in place but have not tried ferrite on the leads yet.

 For what is promoted as the Rolls Royce of headsets I should not have to do r&d on a product to get it to work when I have payed a fair sum of money.Got on to Bob Heil very disappointed with his suggestion to swap power supplies

I have checked for ground loops and even disconnected the earth to the rig.
RF still gets into. The rig.

Please I need help.


On Mon, 7 Nov, 2016 at 1:55, k4pwo k4pwo@... [ic7000]

Do you have a common mode choke on the antenna coax?  Have you tried fferrite on the mike cable?

Perry K4PWO 

Sent from my Sprint Samsung Galaxy S7 edge.

-------- Original message --------
From: "Colin Christie colin.christie34@... [ic7000]"
Date: 11/6/16 7:52 AM (GMT-06:00)
To: ic7000@...
Subject: Re: [IC-7000] Re: RF getting into rig screen shows distortion

Thank you ; this has been done. Junior office girl suggested change leads? Waiting on a more technical answer/ reply.



Might I suggest that you write or email to the Heil company to ask for assistance?  It might be possible that a cable has a problem. 
73 de Mac, K2GKK/5 in OKC, OK

On Nov 5, 2016, at 19:02, Colin Christie colin.christie34@... [ic7000] <ic7000@...> wrote:

Hi Steve,

I have  now inspected and checked each point you raised in your reply.I did not find any problems.
Sadly ,I still have a problem with Heil Pro 7 Ic headset/microphone. 
The standard Icom microphone HM-151 does not cause any problems withe display.

I now can only assume the problem rests with headset/microphone having some sort of  a shielding problem. Strange other owners of Icom IC7000 and PRO 7 headsets have not experienced any issues.

Perhaps the next question I should ask.


Colin vk2jcc


The first thing I would check is ALL of the coax connectors.  If the connectors aren't screwed in and the notches lined up, enough RF can leak onto the outside of the shield to cause RFI in the shack.  

Next check your ground rod connection for tightness and no corrosion.  I assume you have the AH4 tuner case grounded also, along with lightning suppressors ground at the entry point.  Your RF ground rod should be bonded to the electrical panel ground rod, but that is more for lightning protection than RFI.

The shack ground wire has too much inductance to be a good RFI eliminator.  A common-mode choke near the feed point is always the best solution to stop RF on the outside of the shield. 

Baluns can fail and result in several problems that aren't always obvious when an auto tuner is in the path.  Checking the SWR at full power between the tuner and antenna will usually show if the balun is failing.  Visual inspection of the balun coils, ferrite and connections occasionally is a good idea.  Loop antennas require a 4:1 CURRENT balun.  Many hams buy a less expensive 4:1 voltage balun, which doesn't provide common-mode isolation.

Have you run any new feed lines into the shack recently.  They may be the source of RFI.  Also, try moving other cables that connect to the radio (power, rig control, sound card, etc.) to see if the symptoms change.  If the antenna is near the shack it doesn't take much of a change in the location of nearby conductors to create an RFI problem.

I assume the display is attached to the radio chassis, but in case you are using the remote cable, make sure the cable's grounding screw is tight.  Also, the screw must have the correct head diameter so it contacts the metal shield, not just the plastic connector housing.

I had an 80M loop as my first antenna and all of the above are based upon personal experience....

Steve, W3AHL

---In ic7000@..., wrote :


Thanks for viewing.

Running a IC7000 as a base station now for 4 years and have never had an issue with RF getting into the rig.

On transmit the screen shows RF distortion on 14mhz and 7 mhz HF only.

Recently purchased a new HEIL headset/microphone and while using it noticed the problem. I was ready to blame the new headset/microphone until I plugged in the hand microphone and found the same issue . Its the first time I have every had this problem.

Running a AH4 ATU 4:1 balun into a 40m loop. Power output 100watts

Up until now had absolutely no problems running this arrangement. I have the rig grounded outside.

I would be interested to hear from you if you have any theories of what the problem might be and how to address the problem.

cheers  73

 Colin VK2JCC

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