From: Patrick Jankowiak (recycler@swbell.net)
Date: Tue Mar 22 2005 - 18:11:03 PST
You may also find that once you have it set up, if yu use the
regular metal clamp type antenna tie-down, the SWR will change.
PJ
Vadim Kogan wrote:
> Well, now I have...
>
> Yes, moving C8 "up" seems to get things to be rather nice. However, a better
> report is to happen later, as I get to bring this whole setup to a HAM guy
> with a proper antenna analyzer (besides, he'd have more clue when it comes
> to making sure I'm not missing anything during the testing).
>
> I have rather stupid SWR meter (in RCI 2950). It does not give an SWR
> reading, but rather shows SWR as bars (less bars -> closer to 1). There
> seems to be quite some range (for the C8 adjustment) where I get no bars.
> Also the antenna seems to have a rather good bandwidth (I get no bars on 1,
> 19/20, and 40).
>
> However, whether the setup is grounded to the vehicle or not does make a
> difference. As you go up on that capacitor adjustment, you bring down the
> SWR when the setup is grounded to the vehicle, but then you start increasing
> the SWR for the "ungrounded" case. This is somewhat expected, but I was
> hoping that for a vertical dipole it wouldn't be that critical.
>
> I'd also like to mention that my testing is definitely bad, this was just a
> bit of playing around to see the effects of C8 tuning. I was actually doing
> this in the garage (with the antenna on the vehicle, but still indoors).
> Obviously, the real tuning will be outdoors (and with a real analyzer).
>
> I'd also like to figure out what are the parameters of that capacitor. The
> only thing I can read off it is:
>
> SGE (3|8)739 PC(5|S) 0H230
>
> (x|y) means that it's either 'x' or 'y' (I couldn't read it too well).
>
> I put a meter on it, but it didn't give me a usable reading :-( If anybody
> could tell me what kind of capacitor it is, I'd really appreciate it. I have
> a gutted base (everything was rusted) and it seems if I have a similar
> capacitor, it's all I need to make that base usable for CB.
>
> Vadim.
>
> On Fri, Mar 18, 2005 at 06:57:33AM -0500, Stu Ellis wrote:
>
>>Hi Jim!
>>Has anyone tried it??
>>
>>From: "prcradio" <km6ab@p...>
>>Date: Wed Aug 27, 2003 3:31 pm
>>Subject: Re: Modify an MX-6707 with AS-1729 for use on CB?
>>
>>Here are some instructions I gave someone a while back, don't know if
>>they did it or how it worked but it's worth a try:
>>
>>Take the bottom cover off the 1729 and look at the bottom of the ant
>>with the coax cable/connector facing you. Find the 5th tuning
>>capacitor
>>(small screw driver adjustment) counting from the coax cable in a
>>counter-clockwise direction. This capacitor (C8) tunes the lowest band
>>30-33mhz on the antenna and will probably allow you to match the
>>antenna at 27mhz. You will need to have the whip attached and
>>preferably mount the antenna on the vehicle. If not mounted, tune the
>>antenna on a wooden ladder, away from any large metal objects. This
>>antenna does not require a ground plane.
>>Hope this helps.--
>>
>
>
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This archive was generated by hypermail 2.1.4 : Sat May 07 2005 - 20:41:24 PDT