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Author Topic: Huster 5BTV: Good performance on 40m/75m...nothin  (Read 377 times)
KI4ABS
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Posts: 7




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« on: February 16, 2006, 09:58:42 AM »

After almost a year layoff on HF hamming, I recently decided to jump back on.  My first decision was to move my 5BTV and install ground radials to improve perfomance.  Due to being a working college student, my funds are limited, so I purchased a TS-520s to compliment it.  Anyways, I installed it and was pleasantly suprised to find that the 5BTV can really hold its own on 40m.  On nets, I can hear almost everything station transmitting across the country.  However, 20m is very weak...I can only hear the strongest stations.   15m and 10m is a joke...I hear NOTHING but static.    What is going on?  My radial system is currently 12 33' radials going around.  I'm not finished...I have about 10 more cut to add on and will be cutting more and will finished at about 30 33' radials.  My coax run is 100ft of RG-8x from Cable Xperts.  I've tuned the antenna with an MFJ-259b and SWR is perfectly fine across all bands, and resonance (X= on the 259b) is between 1 and 15 across the bands.  It seems like the setup is great, but it's not working on the higher bands.  Thanks for any help in advance.
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RobertKoernerExAE7G
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Posts: 1435




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« Reply #1 on: February 16, 2006, 10:15:47 AM »

Sounds normal for bottom of the sunspot cycle.

You can try making a delta loop for 20 meters, feed it around .25 from the top for vertical performance.  It might be a little better 20 meter distance, when the band is open.

73
Bob
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N0AH
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Posts: 12




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« Reply #2 on: February 16, 2006, 10:17:56 AM »

If 40M is working, then you have no problems with the antenna with the traps below this band.  Sunspots-
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N0AH
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Posts: 12




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« Reply #3 on: February 16, 2006, 10:18:16 AM »

If 40M is working, then you have no problems with the antenna with the traps below this band.  Sunspots-
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W1NK
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Posts: 426


WWW

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« Reply #4 on: February 16, 2006, 10:31:39 AM »

Sunspots....definitely sunspots.

BUT, I'm willing to bet you'll hear activity pick up in the next 24 hours and last about 48 hours as the ARRL DX Contest (CW) kicks off at 0000Z, Saturday.
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W9GB
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Posts: 2600




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« Reply #5 on: February 16, 2006, 02:53:59 PM »

Some 1/2 vertical antenna basics:

1/4 wave vertical needs ... 1/4 wave ground radials.  Think of it this way:  You have a 1/2 wave dipole .. 1/2 of it is vertical and the other half is spread along the ground (got it?).

Now your radial system is currently 12 radials of 33' in length (perfect 40 meter radial length) ...
no wonder your 40 meter recpetion is great ...
now lay down the same number of radials of proper 1/4-wave length for 20 meters (that's about 5 meters - right?) - should see an improvement!

gb
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W9GB
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Posts: 2600




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« Reply #6 on: February 16, 2006, 02:55:55 PM »

You want to add 10 more radials - THEN make them the proper 1/4 wavelength for 75 meters OR 20 meters ...

gb
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K5DVW
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Posts: 2193




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« Reply #7 on: February 16, 2006, 06:34:22 PM »

IF your radials are ground mounted, it really doesnt matter if they are tuned or not. Longer and more are better, but twelve x 33' radials is a fair ground system for the BTV series of antennas for all band operation. The book "Low Band DXing" has a good deal of information about ground systems for verticals.
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N6AJR
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Posts: 9891




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« Reply #8 on: February 16, 2006, 08:47:24 PM »

also 20 meters is a daytime band, and 40 comes on in the evenings. plus the last couple of days the bands have been in and out of the toilet, so hopefully its just time and conditions..
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