[FQP] [FCG] FQP Mobile antennas

Sun Apr 8 10:06:35 PDT 2018

Jeff:
A type 31 mix will do.  Depending upon how many cores you have 
available, I would put 1 or 2 cores at the base of the antenna. Put as 
many turns as possible through the cores; someplace in the neighborhood 
7-8 would be good.  If you have enough cores, put another 1 or 2 at the 
radio with a similar number of turns.  Yes, you will need a bit more 
than 6 feet of cable!  The point is to choke off the currents flowing on 
the shield as close to the antenna as possible.

73 charlie, k1xx

On 4/8/2018 12:55 PM, Jeff Clarke 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> 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, Georgia
>>> http://www.ku8e.com
>>> https://www.linkedin.com/in/jeffrey-clarke-ga
>>>
>>> -------- Original message --------From: Christopher Blake <cqdenx4n at gmail.com> Date: 4/8/18  6:40 AM  (GMT-05:00) To: Edward <edkn4y at embarqmail.com> Cc: k1knq at aol.com, Florida Contest Group <fcg at kkn.net>, FQP <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> 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>
>>>> 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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