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Mobile Antennas and mobile.exe

Jul 24th 2011, 16:40

KQ4B

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
I have been exploring the mobile.exe program from the ARRL Antenna Book CD and comparing the results with some published Bugcatcher designs.

I wonder if anyone has used this program to design and build a mobile antenna and if the "as-built" results are close to the design.

Anyone?

73,

Larry
KQ4B
Jul 25th 2011, 12:45

w1rfi

Super Moderator

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
I'm curious, Larry, how did the mobile.exe results compare with the Bugcatcher designs? IIRC, the Bugcatcher designs require some matching at the base, at least on the low bands. This is always a good sign with mobile antennas, as a simple HF mobile antenna with a 50-ohm base impdeance at the base with no matching is generally going to be inefficient.

73,
Ed Hare, W1RFI
ARRL Lab
Technical forums moderator
Jul 25th 2011, 20:34

KQ4B

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
I have sent you one example via email.

I assume the process is get an initial design and then add the base matching. Note that mobile.exe does produce a capacitor value which I assume is to be used as shown in Figure 20D, Page 16-14, Antenna Book (20th ed.)..

Thanks for the assistance..

73,

Larry
KQ4B
Jul 29th 2011, 20:19

K0BG

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
Mobile.exe works fine, but to a point. Once the overall electrical length exceeds about .16 wave length, the calculated figures aren't very accurate. THe ARRL Antenna book has all of the formulas you need (they're in the Mobile Chapter). They take a lot more work, but the results are very close to real world.
Jul 31st 2011, 14:20

KQ4B

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
Quote by K0BG
Mobile.exe works fine, but to a point. Once the overall electrical length exceeds about .16 wave length, the calculated figures aren't very accurate. THe ARRL Antenna book has all of the formulas you need (they're in the Mobile Chapter).

Tnx!

I will do moe comparisons. I have already started looking at the antenna Book method.

73,
Larry
KQ4B

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