Tag Archives: NN4SA Station

Plenty of room for new members

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We’ve turned in some of the “junk” excess that was littering the club.

 

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HF Amplifier Progress

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The HF Amplifier beside the Yaesu FT-950.

The power switch is located on the West wall.  The box (actually a pill bottle) to control TX switching of the amplifier has been built to link it to the Yaesu transmitter.

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Gallery

Photos from the Antenna Raising

This gallery contains 30 photos.

A photo album of photos I took last week Wednesday (October 7).  We attached the new HyGain TH-11-DX beam antenna to its mast on the tower, and completed assembling the last antenna segment. With much care and attention to safety, … Continue reading

Antenna put to the test.

Finishing Touches

Finishing Touches

Connecting the ground rods.

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Hard Labor

Rob taking his turn cranking up the tower.

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Rotor Controller in place

Rob installed the PL259 and we made the connection to the rig.

Next we checked the tower manual to see what limits the tower travel.  There was no mention of cranking up the tower other than what to do if travel binds up.

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The Old and the New

Just imagine what field day would be like if the antenna on the old 90′ tower was functional.

September antenna work continues

For our work-play session on September 16th, we assembled the antenna elements of the TH-DX-11.  We were visited by KS4UA, who took the photos.

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Matt KA0S applied a paste on parts of the antenna rod elements where they were to be inserted and clamped inside an adjacent rod. Gary WA2JQZ then connected the rods to the correct dimensions and clamped them. [Photo by KS4UA.]

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Don N4MSN (left) and Rob KB5EZ (right) checking dimensions in the antenna manual. [Photo by KS4UA.]

During lunch on September 28, Don N4MSN met up with Stephen Duncheskie KK4IBB and his post driver at at the club.  Within minutes they finished installing two ground rods adjacent to the tower.  They are hard to identify in the pictures so Don circled them.  [Photos by Don N4MSN]

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Stephen KK4IBB using his fence post driver to drive two ground rods for the new antenna tower by the base. [Photo by N4MSN]

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The ground rod locations, indicated by the red circles.  [Photo by N4MSN]

Lunchtime progress, 9/22/2015

TH-DX11

TH-DX11

This Beast is Screaming

“FEED ME!”

Retuning the 160 meter OCF

Redoing our 160 meter OCF antenna. Our group changing the length at the northeast side.

Redoing our 160 meter OCF antenna. Here our group took down the northeast side of the antenna, and soldered a different length extension.

At our last Work-Play session on August 12th, we tried to retune our 160 meter Off Center Fed (OCF) antenna.

We had been using it as our primary multi-band HF dipole antenna.  It worked well on a number of bands: 80, 40, and 30 meters, portions of 17, 15, and 10 meters, and the upper half of the 160 meter band.  We could not, however, tune our transceiver on the lower portion of 160 meters, including the CW portion, without using an extra antenna tuner. Now we have dedicated dipole antennas for most of those other bands.   And so, led by the Station Operation Committee team, we decided to try to retune the 160 meter OCF, to make it usable on the rest of the 160 meter band.

Our first attempt was to change the lengths of the antenna wire at each end.  We removed earlier extensions at the ends and soldered different lengths.

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Temporarily removing the southwest end of the 160 meter OCF antenna from the fence post.

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Michael KG4OZK, Emily KM4LLT, Rob KB5EZ, and Matt KA0S. Rob attached an extension to the southwest half of the OCF antenna.

Emily and Rob soldering an extension to the southwest half of the OCF antenna.

Emily and Rob soldering an extension to the southwest half of the OCF antenna.

View along the OCF antenna from the southwest to northeast.

View along the OCF antenna from the southwest to northeast.

Dave KK4IKR reattaching the southwest end of the OCF.

Dave KK4IKR reattaching the southwest end of the OCF.

Matt KA0S tested the 160 meter OCF with his antenna analyzer. He also checked the other dipole antennas that have replaced the OCF on the other bands, to make sure we have the capability on those other bands.

Matt KA0S tested the 160 meter OCF with his antenna analyzer. He also checked the other dipole antennas that have replaced the OCF on the other bands, to make sure we have the capability on those other bands.

The antenna analyzer results looked good.  That is, we had resonance now at a lower frequency on the 160 meter band.  However, later testing with our rig showed we still had a high Standing Wave Ratio (SWR) with the rig grounded.  Time for more Sherlocking.

After working on the OCF antenna, we reviewed how to use our radio and software for meteor scatter.

After working on the OCF antenna, we reviewed how to use our radio and software for meteor scatter.