[Elecraft] K4D for bargain price on eBay

[Dave (NK7Z)]

Alan,

You are correct, 100%!!  If you want to dupe that kit, buy three 
FT-240-31 cores, and wrap 12 turns of RG-400 around two core.

The cores are around 6 bucks each, and the RG-400 is around $1.25 a foot...

Put one core at the feedpoint of your antenna, one at the rig, (probably 
won't need that one), and then take the third one and wrap 10 to 15 
turns of your 12 volt power around it and put it close to the K4.  That 
will end most of the common mode issues...

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 3/12/24 08:12, G4GNX wrote:
> It’s a no-brainer. That ad is for an RFI kit only. My question is: Are 3 toroids and some bits of wire worth $150?
> 
> Unless I was severely disabled, blind or exceptionally lazy, I’d be ashamed to buy that item!
> 
> 73,
> Alan - G4GNX
> South Coast UK
> Elecraft K4D / KPA500 / KAT500 / IC-9700
> 
> 
> 73,
> Alan - G4GNX
> South Coast UK
> Elecraft K4D / KPA500 / KAT500 / IC-9700
> 
> 
> 
> 
>> On 12 Mar 2024, at 13:42, Kurt Pawlikowski <kurtt at pinrod.com> wrote:
>>
>> Petr,
>>
>>      Looking at the only listing for anything "K4," I found this <https://www.ebay.com/itm/204318009997?itmmeta=01HRSE265CV1YJX0XQ8K8HAGRW&hash=item2f924d6a8d:g:bzEAAOSwiatkSVBn&itmprp=enc%3AAQAIAAAA0JHSyyPQ1ljDZDKiIlX2UrjAtz%2BoiTfl74GzI6wJx0HUam1ARJ9Bwh9q7x0TfNhQeA1rBlInkrAPU6E2bEy5%2BSblGHLv6flCWtN5k5hLWLjCkWWLRQHSJxN9SxPqwibj0a1qfu%2FDhguwza7YsjNhNg%2Bkwb077Dm%2BxB1bw0i0Yg07EneSyp3Ea5R8f%2FLltGGy0yxXcOP%2Bk5mL8MIlC3Y%2BhHUgH3mpQHc%2Fno6vxRgxpc5WCBkMrdBmxZnke5pMRsQjfYfnjJzJcjKM9PR11H4uavs%3D%7Ctkp%3ABk9SR-jiiK7GYw>. If that's what you're looking at, it's an "RFI Kit" for a K4, I don't think it includes the K4 itself! {'-)
>>
>>      kurtt WB9FMC
> 
> 
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to dave at nk7z.net