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alias for: KK4JDO

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If you're coming to this page because we just had a QSO, this is probably where I was operating from.  This is my "shack" and my home office.  

I was probably opearting my Yaesu FT-840, which is constantly undergoing upgrades and mods to correct design flaws from the factory that cause the PLL to unlock and to add more features that should have been included from the factory.  So for, I have add or corrected the following:

  • I have relocated the R2213 3W resistor to the rear of the chassis and replaced with a 30W power resistor and added a much needed heat sink.  The resistor, as originally designed, always fails, and literally toasts the board as well.
  • I have replaced all of the electrolytic caps on the local unit, and a lot of them on the main unit as well.
  • I have added an internal Arduino based K3NG keyer with a paddle jack and command button on the rear of the chassis.
  • I have added a G4HUP high-impedence buffer and pre-amp board to tap the IF, giving me the ability to use an RTL-SDR dongle and HDSDR as panadapter, complete with "click-to-tune" to tune to signals on the waterfall just by clicking on them.
  • I have built a USB-to-Serial adapter that also monitors the CAT commands and illuminates a super bright green LED when receiving, and a super bright red LED during digital mode TX to make it easier to see whats going on with the rig while operating modes like JT65.  It also has a flashing green LED on the front to show when CAT commands are flowing.
  • I have built a KF5INZ "EZ-DIGI" soundcard isolation interface with PTT (not currently using the PTT since building the CAT interface).

Upcoming projects for the FT-840 are:

  • Route some lines from the mic connector to the rear of the case to allow for digital mode AF-in while the mic is still connected.
  • Make the current USB-to-Serial adapter an internal component with a USB connecton on the rear of the chassis for rig control.
  • Add multi-color LEDs to the front panel and S-meter.  Considering making the panel or meter backlight shift from green to red depending on the RSSI.
  • Considering adding some LEDs to make the buttons readable in a low light setting since they are not currently backlit.

Here are a few pictures of the FT-840:





My other interests are cycling and kayaking.


I also enjoy spending time with my family when they feel like spending time with me (those of you that have teenagers will understand...).


I also occasionally dabble (poorly) in woodworking, mainly to make things for the kids, like this planform replica of one of the guns used in the Halo video game.


Thanks for stopping by!






My meager collection of awards:



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7012901 Last modified: 2016-01-16 21:08:43, 4856 bytes

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QRZ Logbook Summary for - AA4IO
Latest Contacts for AA4IO at QRZ.com
dedateband mode grid Country op
YY7PMG 2016-08-24 40m JT65 FK81bb Venezuela Gonzalez G. Pedro M.
KB0PPQ 2016-03-08 17m JT65 EM29od United States CARY T HOUCHINS
VA3MIU 2016-02-14 20m JT65 FN25ej Canada Joe
WB4JWM 2016-02-10 160m JT65 EM83ji United States THOMAS S MILLS
EA3KU 2016-02-08 40m JT9 JN00jv Spain FERNANDO , MARTINEZ LIZAMA
I1RJP 2016-01-31 40m JT65 JN45bo Italy MARIO ROJATTI
KK2DOG 2016-01-31 40m JT65 FN24dd United States Michael E Elcsisin
VE2HJ 2016-01-26 15m JT65 FN46uc Canada Donald Bisson
KG6CIH 2016-01-26 15m JT65 FN42gs United States Christopher E Lumens
W8LMG 2016-01-26 80m JT65 EM98vd United States LIONEL M GRAY, JR (Mac)
W8LLL 2016-01-20 20m JT9 EN82kl United States LARRY J LA VASEUR
WL7CG 2016-01-19 40m JT9 BP61xb Alaska ALAN J SORUM
IT9CCB 2016-01-19 40m JT65 JM77pc Italy N.H.Cutrufo Adriano
K0ZRK 2016-01-15 40m JT65 EM36jx United States LYLE HODGES
KB3OZC 2016-01-15 40m JT65 FN20dg United States Joel R Rubincam

Book Totals: 341 qso's   155 confirmed Get a free logbook at QRZ.COM

Grid Squared Award#13046
Granted: 2016-07-12 17:10:02   (AA4IO)

World Continents Award#9791
Granted: 2015-07-19 21:25:02   (AA4IO)

  • 20 Meters Mixed
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