| Author |
Message |
    
Doctor
New member
Username: Doctor
Post Number: 7
Registered: 8-2018
| | Posted on Monday, October 08, 2018 - 8:28 pm: | 
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I see where some ops use this on 40 meters, where do they hook on to it for 40 meters and the length of the add-on, presume a wire or 109 inch whip or?
CEF795 |
N8fgb
Intermediate Member
Username: N8fgb
Post Number: 132
Registered: 5-2002
| | Posted on Wednesday, October 10, 2018 - 8:44 pm: |
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Doubt it will do anything 40 meter. Usable on 10,12,15, and 17. |
Doctor
New member
Username: Doctor
Post Number: 8
Registered: 8-2018
| | Posted on Wednesday, October 10, 2018 - 8:44 pm: |
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I found in reading some OPS HAVE attached /removed the 11 meter top and screwed in the mobile whip in it's place and it works good, will report if I have time this weekend to give it a try.
CEF795 |
N8fgb
Intermediate Member
Username: N8fgb
Post Number: 133
Registered: 5-2002
| | Posted on Thursday, October 11, 2018 - 7:18 pm: |
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If your whip is about 25 long. The A99 is half wave on 11 meter, to get that 40 meter, do the math. |
Doctor
New member
Username: Doctor
Post Number: 9
Registered: 8-2018
| | Posted on Friday, October 12, 2018 - 4:40 pm: |
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REORT
I removed the whip on top and screwed in the mobile 40 meter whip..one from MFJ, it tuned up 1 to1 swr, and talked to CLEVELAND, OHIO 5/9 running 60 watts, it works good.
I also tried the 102 inch whip, NO luck on it at all.
CEF 795 |
N8fgb
Intermediate Member
Username: N8fgb
Post Number: 134
Registered: 5-2002
| | Posted on Tuesday, October 23, 2018 - 11:45 am: |
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Compare it to the MFJ by itself at the same height with a counterpoise. |
Raya
New member
Username: Raya
Post Number: 2
Registered: 6-2017
| | Posted on Thursday, February 14, 2019 - 5:28 pm: |
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Not possible. 40 Meters/7 Mhz quarter wave length is about 33 feet long. 10 meters perhaps. Perhaps maybe 15 meters if you push it. But 40 Meters nahhh |
Tech833
Moderator
Username: Tech833
Post Number: 2427
Registered: 8-2002
| | Posted on Sunday, February 17, 2019 - 1:39 pm: |
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This is aimed mostly to OP "Doctor":
I wonder how adding a 40m mobile whip to the top of an A99 got you low SWR and performance on 40m. That is very interesting!
The internal series capacitor inside the A99 between the matching network and the antenna wire would look like an open circuit at 40m. Also, the few turns of parallel inductance at the feedpoint would look like a dead short at the coax connector on 40m. Something either very special or very wrong happened here. Please tell us more.
Your radio 'Mythbuster' since 1998
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Doctor
Junior Member
Username: Doctor
Post Number: 18
Registered: 8-2018
| | Posted on Monday, February 18, 2019 - 8:46 am: |
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WELL only thing I did was just attach the mfj whip, and used my auto tuner on it, and your right it should not work BUT it works still today.
CEF795 |
