[FQP] [FCG] FQP Mobile antennas

Sun Apr 8 10:04:19 PDT 2018

Hi Jeff,
I suggest placing the ferrite chokes as close to the antenna as possible;
run the coax along the roof after that until it connects to go inside the
cab.
Chokes also can help at the power supply (near the output) particularly if
it is a switching power supply.
I also have more chokes handy in case we need them near the PC's power
supply.

Hope this helps.

vy 73,
Chris, NX4N

On Sun, Apr 8, 2018 at 12:55 PM, Jeff Clarke <ku8e at ku8e.com> wrote:

> Jim,
>
> What type of ferrite core do you use for your common mode choke? I have a
> bunch of the DX Engineering snap-on ferrite beads (Type 31). Will those
> work? Do you put it near the antenna or the coax that goes into the radio?
> We have about a 6 foot run of RG8X from the actual antenna to the radio.
>
> Every year it seems like we have always have problems on 40 meters with
> the computer locking up at some time from stray RF.
>
> Jeff
>
>
> On 4/8/2018 12:22 PM, Jim Stahl wrote:
>
> Does the antenna check out normally on an antenna analyzer? Can you run low power without the radio going crazy?
>
> You might also consider, if you haven’t already done so, a common mode choke at the antenna feedpoint. That is, wrapping several turns of coax around an appropriate ferrite core. K9YC has written extensively on this. It may be more of a bandaid (sorry, bad pun) than the real fix, but it might get you the few db edge needed to make the radio happy.
>
>
> 73  -  Jim   K8MR
>
>
>
>
> On Apr 8, 2018, at 10:17 AM, Jeff Clarke <ku8e at ku8e.com> <ku8e at ku8e.com> wrote:
>
> Might be your grounding. If you are using Hustler mobile whips they are very sensitive to this. John is coming over my house today and we are testing ours out.
> Jeff
>
>
> Jeff ClarkeInformation Technology Professional Ellerslie, Georgiahttp://www.ku8e.comhttps://www.linkedin.com/in/jeffrey-clarke-ga
>
> -------- Original message --------From: Christopher Blake <cqdenx4n at gmail.com> <cqdenx4n at gmail.com> Date: 4/8/18  6:40 AM  (GMT-05:00) To: Edward <edkn4y at embarqmail.com> <edkn4y at embarqmail.com> Cc: k1knq at aol.com, Florida Contest Group <fcg at kkn.net> <fcg at kkn.net>, FQP <fqp at kkn.net> <fqp at kkn.net> Subject: Re: [FQP] [FCG] FQP Mobile antennas
> Ed- Yikes!
> Perhaps it's the mount itself?  Maybe you can try moving the 20m resonator
> to a different mounting spot?
> Can't imagine the thought of no 20m!!!
>
> please keep us posted; good learning opportunity for all of us.
>
> GL OM/73,
> Chris, NX4N
>
> ps- any fixed/portable station projects out there?
>
>
> On Sat, Apr 7, 2018 at 11:55 PM, <edkn4y at embarqmail.com> <edkn4y at embarqmail.com> wrote:
>
>
> I feel the pain, I installed my resonators on the van. transmitted on 10,
> 15, 40, 80 but when I transmitted on 20 meters the radio went crazy. I
> ordered a new resonator to be here Monday. I hope this is the problem, or I
> do the QSO party on 10,15 and 40. Never had this problem before, might be
> the new GMC van. Hope not.
> Ed KN4Y
> ----- Original Message -----
> From: K1KNQ via FCG <fcg at kkn.net> <fcg at kkn.net>
> To: fcg at kkn.net, fqp at kkn.net
> Sent: Sat, 07 Apr 2018 13:13:36 -0400 (EDT)
> Subject: [FCG] FQP Mobile antennas
>
>
> Ok, I get it, the Gods of mobile operation just don't like me....
> Worked yesterday and today putting my mobile antennas back on the car.
> Same position and same antennas as last few years.
> Everything nicely matched last year.
> Completely  different this year. 1 to 2 inches shorter on the whips!!!
> Same everything including coax lengths, switching etc.
> It must be the either car or operator is getting old.
>
> Anyway Done...
>
> 73
> Jack K1KNQ
> aka K4FCG/M
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> --
> *Jeff Clarke*
> Information Technology Professional
> Ellerslie, Georgia
>
> My LinkedIn Profile <https://www.linkedin.com/in/jeffrey-clarke-ga>
>