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Rain Gutter Antenna, Part 2

The rain gutter antenna is up and running.

A-B testing against the attic dipole shows that it is best on 40M and 80M.  It is quieter and the signals are stronger.  On 20M, both the signal and the noise are both down, but the noise is down more than the signal.

I’m tuning it using an SG-230 SmartTuner and it’s fun to watch the SWR-meter as it is working. When I go key-down the SWR-Meter needle dances around for a second or two and then BAM! the SWR goes to almost 1:1.

Thinking About Low-Noise Receiving Antennas

I’m considering installing some sort of low-noise receiving antenna.  The static on 20M here is sometimes S9.  The past few days I’ve heard some European stations but they were too far buried in the noise for me to pull them out. Even my TS-590’s DSP NR circuits are not enough.

My house is at the back of my subdivision and there is a vacant area behind me that extends eastward for 5-6 houses, or approximately 240 feet – enough for a beverage antenna.  My TS-590 has a separate jack on the rear panel for a RX antenna.

Time to order some magnet wire.

Kenwood TM-D710A APRS – Getting Started

I recently bought a Kenwood TM-D710A to use at the VHF/UHF radio here at the home QTH, I’m slowly dipping my toes in the APRS pond.

GEtting it to receive and display APRS packets was a no-brainer:

  1. Turn radio on.
  2. Tune the left side (‘A in 710 parlance) to 144.390.
  3. Push the TNC button a couple of times until ‘APRS12’ appears at the top of the display.

Today I decided to take the next step and see of I could get it to ‘beacon’.   I configured the settings (NOTE: I do not claim these to be optimal settings.  This is simply what I used initially that worked):

Basic Settings (Menu 600)

  • My Callsign : WB7OBG
  • Beacon Type : APRS

Position  (Menu 605)

  • Name: Home
  • Lat/Lon : transcribed from a hand-held GPS (I do not have a GPS unit attached to the radio.  It’s a base station)

Beacon Information (Menu 606)

  • Speed: Off
  • Altitude: Off
  • Position Ambiguity: Off

Position Comment (Menu 607)

  • In Service

Status Text (Menu 608)

  • 1 Text: Home
  • 1 TX Rate: 1/4

Station Icon (Menu 610)

  • The little House symbol

Beacon TX Algorithm (Menu 611)

  • Method: Auto
  • Initial Interval: 10min
  • Decay Algorithm: Off
  • Proportional Pathing: Off

Verifying that it is Working

To verify that I was actually transmitting something intelligible, I went to:

http://aprs.fi

and entered my callsign in the ‘Track Callsign’ field and clicked search. Shazam!  There I was!

 

 

 

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