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September 21st, 2016 Comments off

Katy Amateur Radio Society (KARS), Katy, Texas

Recurring Events

Event Time Location Notes
KARS Net Every Tuesday, 8:00 PM KARS Repeater KT5TX 147.200(+) MHz Repeater, PL 141.3
KARS Monthly Meeting 2nd Monday of Every Month, 7:30 PM Memorial Hermann Katy Hospital – Tiger Room A 23900 Katy Freeway, Katy, TX  77494
KARS VE Session (Licensing Exam) Saturday, March 11, 2017, 9:30 AM HCESD Fire Station #4 No Pre-registration Required
KARS Coffee Every Wednesday, 7:30 PM Starbucks 547 S Mason Rd, Katy, TX 77450
KARS Breakfast Every Saturday, 8:00 AM Luby’s 485 S Mason Rd, Katy, TX 77450

Katy Amateur Radio Society (KARS) is an active club in Katy, TX, just west of Houston, dedicated to the fascinating hobby of amateur radio.

Please come and join in the fun!

Categories: Club Info

April ’16 Meeting – K1N Navassa Island DXpedition

April 6th, 2016 No comments
The April 2016 Meeting will be at 7:30 on April 11 at HCESD Fire Station #4, 22855 Franz Rd, Katy, TX 77449.
Bob Bently WB3EWP will give a video presenation on the K1N, Navassa DXpedition. This should be a very interesting presentation.
Categories: Club Info

March 2016 Meeting Minutes

April 6th, 2016 Comments off
Categories: Club Info

March ’16 Meeting – Power Supplies, Linear and Switching

March 3rd, 2016 No comments

The March 2016 Meeting was at 7:30 on March 14 at HCESD Fire Station #4, 22855 Franz Rd, Katy, TX 77449.

Summary of Presentation by Brian AF5IT:

Sooner or later every ham wants or needs to set up a mobile radio in a base station configuration.  Doing so will require a power supply which converts the 120 volts AC power to 12 to 14 volts DC power.  There are primarily two types of regulation used in today’s commercially available power supplies:  Linear and Switch Mode.  The linear regulation supply constantly draws AC current and regulates on the DC side of the step down transformer by using a transistor as a variable resistor.  Output current draw adjusts base bias on the transistor allowing for constant voltage output.  Any unused power is dissipated off as heat.  Advantages:  less parts, easier to troubleshoot.  Disadvantage:  not too efficient

The switch mode supply regulates by rectifying AC power, using that filtered, but unregulated, voltage to power an oscillator IC chip whose output drives a switching transistor.  In the transistor collector circuit is the primary of a transformer.  The on and off action of the transistor causes current to go and stop through the transformer, resulting in a magnetic field which is felt by the secondary and creates current flow in the secondary circuit.  This waveform is a square wave running at around 15Khz.  The wave is rectified and filtered and sent to the device needing power.  Output voltage fluctuation is detected and feedback to the IC chip which adjusts its output frequency and/or duty cycle, adjusting the voltage across the transformer primary.  Power is only drawn for the AC supply when needed.  Advantages:  Highly efficient, cooler running.  Disadvantage:  many parts and may be victim of domino effect failure.

Categories: Club Info

February ’16 Presentation – Software Defined Radio

February 9th, 2016 No comments

Monday, February 8, 2016 , at 7:30 PM
West I-10 Fire House at 22855Franz Rd, Katy, TX 77449

SDR Clip

KF5CZO gave a presentation, a high level overview of SDRs, software defined radios.

KARS – Software Defined Radio Presentation.pdf

Categories: Presentations

January Presentation – RF Propagation, Introduction and Overview

January 20th, 2016 No comments

RF Propagation, Introduction and Overview

Monday, January 11, 2016 , at 7:30 PM
West I-10 Fire House at 22855Franz Rd, Katy, TX 77449

 

IMG_1156

 

WB5KVV gave a presentation on RF propagation.  He covered different types of propagation, considerations and special cases.

RF Propagation 101 Jan2016.pptx

handout RF Propagation 101.doc

Categories: Presentations

December Monthly Minutes

December 14th, 2015 No comments

KARS MONTHLY MEETING MINUTES DECEMBER 2015

December 14, 2015. Special Christmas Dinner meeting.
Spring Creek Barbeque, I-10 & Westgreen Blvd., Katy, TX

Meeting called to order by President Bob WB3EWP at 7:32 PM.

Twenty members and sixteen visitors were present. Everyone introduced themselves. All enjoyed a fine barbeque dinner as served by the Spring Creek folks.
One visitor, Mark Lorie, KG5JBJ submitted an application for membership. This will be placed on the January meeting agenda.

Motion by Mark N5YUS and seconded by Tommie KG5FMY to accept the minutes of last month’s meeting as posted on
the website. Motion passed.

The Treasurer’s report was given by Mike KA5OXA. Motion by Mark N5YUS and seconded by John AK5AK to accept the treasurer’s report. Motion carried.

There was no Board of Directors meeting in November to report on.

Old Business
Our weekly net continues on Tuesday evenings at 8:00 PM on our repeater, 147.200 Mhz, +600KHz offset, and PL tone of 141.3Hz.

A date to install the new VHF/UHF antenna and replace the 450 ohm ladder line is needing to be set. District 48 fire department has just received delivery of its ladder truck which would be very helpful in doing this activity.

The KARS club repeater has been successfully moved to a site on top of the Memorial Hermann Katy Hospital. The antenna is approximately 140 above ground and offers a much larger coverage area. A big “Thank You” goes out to Darrell KK5LG for working with ESD 48, the West I-10 fire department, the attorneys and the court to get our repeater out of station #2. The KARS treasury funded the cost of the move and is accepting donations to offset the costs. See Mike KA5OXA if you can help.

New Business
A vote on two applications for membership as previously submitted to the club:
Ben Keel KF5ZRN and George Graves KG5KOB. Motion by Mark N5YUS and seconded by Scott KT5SR to accept these applicants into membership of the club. Motion passed.

KARS is offering several Technician level ham classes throughout 2016 using the Ham Test Online curriculum. Access to the online class is $15.00 through the club instead of the regular cost of $24.95 per student. We do need a minimum of five student per session. Optional classroom work will be one to two hours of mentoring and clarification for four weeks on Saturday mornings leading up to the test. Have a family member, friend, neighbor interested in becoming a licensed amateur radio operator, then invite them to attend the class. Mike KA5OXA is heading up this training.
A nomination committee has been formed in advance of 2016 club officer elections. We will be electing a new President, Vice President, and Secretary for 2016. Voting is during the March meeting.

Announcements
The next Board of Directors meeting is set for Tuesday, December 22, 2015 at 7:30PM at fire station #4 on Franz Rd.
The next club monthly meeting is Monday, January 11th at 7:30 at fire station #4 on Franz Rd.

Hearing no further business to conduct, President Bob closed the meeting at 7:54PM.

Entered into record this 14th day of December 2015 by Brian Havran, recording secretary.

Categories: Club Info