MFJ-4416B Battery Booster RF sensing

[Kenneth Christiansen]

Hi to the group.

I had a good time working field day QRP Battery and made 119 5 watt CW contacts using a solar panel for charging etc.

I plan to go on vacation in about a week and bought a MFJ-4416B battery booster to use with my KX3 and KPA100 in my camper. I see a SO239 jack on the booster that needs some RF to turn the unit on during transmit and off during receive. I tried letting it run during receive but it makes a low level nasty interference on 20 CW. Does anyone have experience feeding RF to that jack? I feel it would be undesirable to have a branch off my feed line that would act as a tuned stub. I feel the RF switching would be desirable but need to know the best way to do it.

Thanks in advance. And 73

Ken.  W0CZ
w0cz at i29 dot net



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[Bill Frantz]

I have a N8XJK boost regulator which has RF switching like your
booster. I use a UHF "T" connector -- 2 female and 1 male. I
connect the male plug directly to the booster and then use coax
jumpers to connect the radio and the antenna. That way the stub
is so short that it doesn't have a noticeable effect on the
antenna match.

73 Bill AE6JV

On 6/26/16 at 7:51 PM, [hidden email] (Kenneth Christiansen) wrote:

>I plan to go on vacation in about a week and bought a MFJ-4416B
>battery booster to use with my KX3 and KPA100 in my camper. I
>see a SO239 jack on the booster that needs some RF to turn the
>unit on during transmit and off during receive. I tried letting
>it run during receive but it makes a low level nasty
>interference on 20 CW. Does anyone have experience feeding RF
>to that jack? I feel it would be undesirable to have a branch
>off my feed line that would act as a tuned stub. I feel the RF
>switching would be desirable but need to know the best way to
>do it.

-----------------------------------------------------------------------
Bill Frantz        | Truth and love must prevail  | Periwinkle
[phone]      | over lies and hate.          | 16345
Englewood Ave
www.pwpconsult.com |               - Vaclav Havel | Los Gatos,
CA 95032

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[James Bennett]

Bill and Ken -

I too have the N8XJK boost regulator and mine made some trash on a few bands. This was very easily resolved with a 2.5 inch mix 31 ferrite core with several turns of the supply line wound through it. LOTS easier than messing with the RF sense stuff on the unit. I have zero garbage coming from the regulator with the ferrite on the line.

Jim / W6JHBH

> On   Tuesday, Jun 28, 2016, at  Tuesday, 3:40 PM, Bill Frantz <[hidden email]> wrote:
>
> I have a N8XJK boost regulator which has RF switching like your booster. I use a UHF "T" connector -- 2 female and 1 male. I connect the male plug directly to the booster and then use coax jumpers to connect the radio and the antenna. That way the stub is so short that it doesn't have a noticeable effect on the antenna match.
>
> 73 Bill AE6JV
>
> On 6/26/16 at 7:51 PM, [hidden email] (Kenneth Christiansen) wrote:
>
>> I plan to go on vacation in about a week and bought a MFJ-4416B battery booster to use with my KX3 and KPA100 in my camper. I see a SO239 jack on the booster that needs some RF to turn the unit on during transmit and off during receive. I tried letting it run during receive but it makes a low level nasty interference on 20 CW. Does anyone have experience feeding RF to that jack? I feel it would be undesirable to have a branch off my feed line that would act as a tuned stub. I feel the RF switching would be desirable but need to know the best way to do it.
>
> -----------------------------------------------------------------------
> Bill Frantz        | Truth and love must prevail  | Periwinkle
> [phone]      | over lies and hate.          | 16345 Englewood Ave
> www.pwpconsult.com |               - Vaclav Havel | Los Gatos, CA 95032
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
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>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

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