[FQP] [FCG] FQP Mobile antennas

Sun Apr 8 11:25:48 PDT 2018

Tuning of my antenna was very "tricky" and I had a lot of RF in the cabin
until I installed a common mode choke right at the base of the antenna. I
used two cores of mix 31 and two turns of the coax. I based my choke on
info from this YCCC article
<http://www.yccc.org/Articles/W1HIS/CommonModeChokesW1HIS2006Apr06.pdf>

There is a new mix (75) out but right now the cores are much more expensive
than 31. I bought a couple to put on some USB cables but have not tried the
larger ones I would need for coax since the mix 31 cores are working fine.

Also from reading K9YC I think he would recommend twisted pair rather than
zip cord for the power supply connection. I have not actually tried his
recommendation however.

73/Chuck/NO5W

On Sun, Apr 8, 2018 at 12:11 PM, charlie carroll <k1xx at k1xx.com> wrote:

> Chris:
> I agree with your comment about putting chokes on the 12 volt line.
> However, type 31 is not the best material in this case.  I actually use
> the chokes advertised on the N8XJK super booster web site for the 12
> volt application.  Made a huge difference in getting rid of noise coming
> in on the dc line.
>
> 73 charlie, k1xx
>
> On 4/8/2018 1:04 PM, Christopher Blake wrote:
> > 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>
> >>
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