Articles with tag “Antennas”

APRS SATCOM base antennas

Years ago, Bob Bruninga, WB4APR, talked about a "good" antenna for APRS SATCOM applications.  It was a 19-inch vertical antenna that would function on both the 2m and 70cm bands, and had lobes that were up around the 30-degree mark.  Looking for information on that antenna last night I found …

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J-Pole antennas for SAR

[caption id="attachment_1055" align="alignleft" width="169"]Image of fibreglass mast with two VHF j-pole antennas affixed. Fiberglass mast with two VHF j-pole antennas affixed.[/caption]

I recently started working with Calvert K9 Search, a local SAR team that specializes in using dogs to search for people.  In an effort to improve communications between the command post (base) and teams …

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N6NB VHF/UHF Quad Antenna

N6NB VHF/UHF Quad Antenna drawingI'm interested in VHF and higher bands.  Unfortunately my current home doesn't permit me to really dive into these bands like I'd prefer (with LOTS of big antennas!).  So, to get my fix, I'm hoping to build a rover station that I can use go catch some new grids and …

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Now on medium wave!

160m on Kenwood TS-2000XYears ago I purchased a 40-80-160m dipole antenna in hopes of getting a good signal out on the lower bands. Unfortunately the antenna ended up being too large for my yard and I didn't use it.  Fast forward to now and I've got plenty of room for antennas.  When I …

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Breaking the Arrow Antenna's diplexer

The Arrow Antenna for satellites has an optional diplexer that allows easy operation of 2m and 70cm from a single feedline.  I've used this configuration for over ten years with no problems.  I'm not sure, exactly, what happened but the diplexer failed.  After ordering a new one I started digging …

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Parabolic antenna beamwidth calculations

Okay, I'm thinking about parabolic antennas right now.  I created a spreadsheet that would take care of all the formulas some years back but I can't seem to find it now.  I'm trying to find all the formulas that I need to get the information I need to make my …

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Antenna maintenance

[caption id="" align="alignleft" width="320" caption="Harlan helping with antenna maintenance."]Harlan helping with antenna maintenance.[/caption]

The weather was nice enough for me to get some of my antenna maintenance done that I couldn't do during the cold winter months.  First on the list was to completely remove the 23cm (1.2GHz) antenna …

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All antennas up in the air.

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All antennas are up. I now have 11 elements on 2m, 22 elements on 70cm, and 25 elements on 23 cm. I was able to trim a couple of branches out of the nearby tree and now my antennas swing nearly free through space.

I've also noted that the only …

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New antennas up in the air.

image0It was hot this afternoon but I was able to get two of the three planned antennas up. Tomorrow is the ARRL UHF Contest so hopefully I'll be ready (still have to trim a limb or two out of a tree).

Top antenna is 23cm (1278MHz) and the lower one …

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Received 23cm antenna

Came home to find a long box on the doorstep. Opened it up to find my new 23cm (1.2GHz) antenna ready for assembly. In less than an hour I had my twenty-four element loop yagi put together and ready for talking. Now I just need to get some N …

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