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Post by thelegacy on Sept 13, 2017 14:59:50 GMT
This is the result I wanted to find out about. At first when I didn't know that the Landlord would eventually give in and allow an outside antenna which eventually became a ground plane so long as I didn't drill holes I almost bought that antenna and was going to hang it right in the window to allow my signal to reach outside. Being I have an SWR meter on top of the suggested length for my chosen frequency I was going to also do my own SWR check on that frequency to see if it was matched.
I'm curious however to see if the antenna has better performance than just a standard telescopic whip antenna. Is the range more stable or is it all over the place with variable signal levels.
A better design for that antenna (especially for the price) would be to make it so it could be used for either outdoor or indoors. But it is what it is.
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Post by Deleted on Sept 13, 2017 15:41:01 GMT
Morning On Campus
Here at home school college the weather people say we are getting the remnant of Hurricane Irma, which is slightly misty, cool, cloudy. Fine time to fiddle indoors.
The GPL32 Decade Antenna is pleasant to handle... neatly built, rated for a maximum of 75 Watts. At first I wondered why anyone would use that much power indoors but then I realized that up in the attic it could make sense.
The input connector is a UHF type and I can't find my adapter to allow using BNC or F-cable, but I'm looking through boxes. If necessary I will either make or order a proper cable.
Of course that means I haven't tried it yet, but I'm slow.
Because it forms a full dipole it will probably be better than a common whip, which is only 1/2 of a dipole.
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Post by Deleted on Sept 20, 2017 17:46:04 GMT
Large Antenna Discovery
We mounted the Decade GPL32 FM Antenna on the high-up woodwork spanning between two windows, not far below the ceiling, and lengthed the two whips to the sizes specified in the tuning instruction.
The transmission line is a sufficient BNC coax plugged into the EDM FM Transmitter down below on a surface 30" from the floor.
The resulting FM signal throughout the building is completely solid with no dead spots or multipath.
We are so impressed by the performance with the GPL32 Antenna that we shall equip all our FM transmitters with these antennas except for any outdoor installations that may be done in the future.
Right now I will be making dBu measurements throughout the interior and around the exterior of the building.
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Post by Druid Hills Radio on Sept 21, 2017 12:51:53 GMT
Large Antenna DiscoveryWe mounted the Decade GPL32 FM Antenna on the high-up woodwork spanning between two windows, not far below the ceiling, and lengthed the two whips to the sizes specified in the tuning instruction. The transmission line is a sufficient BNC coax plugged into the EDM FM Transmitter down below on a surface 30" from the floor. The resulting FM signal throughout the building is completely solid with no dead spots or multipath. We are so impressed by the performance with the GPL32 Antenna that we shall equip all our FM transmitters with these antennas except for any outdoor installations that may be done in the future. Right now I will be making dBu measurements throughout the interior and around the exterior of the building. I noticed that the spec sheet says the antenna exhibits 0 dB gain. Not sure how they arrived at that since a dipole is around 2dBi.
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Post by Deleted on Sept 21, 2017 14:17:45 GMT
Aircraft Band
Even with the clean signal report given by Tim in Bovey in his review on the EDM FM Transmitter, I scanned the aircraft band between 118 and 137 MHz to determine if my EDM was spewing spurs.
At 118.750 there's a blast of racket I call "fush" but it is not coming from my transmitters.
At 120, 125 and 135 MHz are various complex tones and digital transmissions, not mine.
The receiver is a Grundig SATELLIT 750.
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Post by Druid Hills Radio on Sept 21, 2017 14:50:08 GMT
Aircraft Band The receiver is a Grundig SATELLIT 750. Maybe the tones you are hearing are from space since you are using a Grundig Satellite receiver.
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Post by Deleted on Sept 21, 2017 14:55:23 GMT
It's Getting Crowded Up Here
Druid Hills Radio surmises: "Maybe the tones you are hearing are from space since you are using a Grundig Satellite receiver."
Many of our part 15 stations broadcast from space.
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Post by Druid Hills Radio on Sept 21, 2017 15:12:39 GMT
It's Getting Crowded Up HereDruid Hills Radio surmises: " Maybe the tones you are hearing are from space since you are using a Grundig Satellite receiver." Many of our part 15 stations broadcast from space. In many cases small spaces.
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