DAREN of WV News March 26, 2017 (.C90)
WA8LLM (304) 679-3470 wa8llm@yahoo.com
WOOD COUNTY EMERGENCY COMMUNICATIONS, 319 COMMUNICATIONS DR, WAVERLY, WV 26184
www.wc8ec.com or www.wc8ec.org
DAREN News, are articles and information about the Digital Amateur Radio "Emergency" Network of WV, which operates on 145.69 MHz. Anyone having any information about DAREN, or Amateur Radio in general, and would like to share it with others, may send it to WA8LLM @ PKBGWV on 145.69 MHz, or to my E-Mail: wa8llm@yahoo.com. A State Wide DAREN NET is operated every Saturday from 7:00 pm to 10:00 pm, and lately, before and after those hours. The DAREN Net Announcement, showing the MAIN NCS, ALTERNATE NCS, NODEs accessible to both, and the previous week's check-ins, are posted by Thursday on most of the Main county DAREN PBBS'. The DAREN News can also be found on the www.wc8ec.com and www.wc8ec.org websites.
On our way back from the Charleston Hamfest yesterday, my wife Dot, KC8HAI, and my Nephew Sammy Mercer, N8SVX, stopped by the Jackson County NODE/PBBS of JACKWV/RPLYWV. For some reason the radio reset itself back to 145.000 MHz. We changed to the frequency back to 145.69 MHz, and the station is working again.
(continued from last week)
(12) Wire a 10K Ohm trim pot between one of the Black (Ground) wires and one of
Yellow (+12) wires, one on each end of the trim pot. You might want to
mount or secure the trim pot somewhere on the PCB. Be sure you can adjust
the trim pot.
(13) Connect a wire to the Wiper (center pin) of the trim pot. Make it long
enough to reach Pin 1 of the TL494 or KA5700B.
NOTE: Be careful on the next few steps, since there are high voltages in
the power supply.
(14) Apply 110 Volts to power supply PCB.
(15) Measure the voltage between the Wiper of the trim pot and one of the Black
(Ground) wires. Adjust the trim pot to the same voltage as was read in
Step 10.
(16) Now remove the 110 volts from the power supply.
(17) Remove all connections going to Pin 1 of the TL494 or KA5700B. Remove
resistors, cut Printed Circuit Board traces, or what ever it takes to make
Pin 1 have NO connections.
(18) Connect the wire coming from the trim pot wiper to Pin 1 of the TL494 or
KA5700B. If you are careful, you can solder the wire to the top of Pin 1.
Or, you can connect it to Pin 1 under the PCB.
NOTE: Be careful on the next few steps, since there are high voltages in
the power supply.
(19) Apply 110 Volts to power supply PCB.
(20) Measure the voltage between one of the Yellow (+12) wires and one of the
Black (Ground) wires. The voltage should be around 12 Volts.
(21) Adjust the trim pot to 13.8 Volts.
(22) The Black (Ground) wires and Yellow (+13.8) wires can be connected to
whatever terminals you want to use.
The rest of the modifications and changes are up to you. Here are just some suggestions. Place an 8 Amp Slow Blow fuse in the +13.8 lead. Use Anderson Power Pole plugs for terminals. Add a power switch. Trying to convert the +5 Volts 20 Amp output would take too many changes. We tried to get 12 or 13.8 Volts out of the +5 by doing the same thing as we did with the +12 Volts, but the highest voltage we could get was 11 Volts. To get the +5 Volts to go to 11 Volts we had to remove a Zener Diode to let it go past 6 Volts. When we loaded the 11 Volts down with power resistors the voltage dropped to 10 Volts, not very well regulated. If you're not going to use the +5 Volts you've still have a cheap power supply. Besides, if you figure the wattage on the +5 Volts at 20 Amps is 100 Watts. When you figure 13.8 Volts at 8 Amps, you will get 110 Watts. So why do all the work to modify the +5 Volts to 13.8 Volts. (end)
There were 32 check-ins to the State Wide DAREN Net this week. Ken "Cappy" Caplinger, WV8KDC, needs only one more check-in to make 50.