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This home brew SO2R controller project follows the “old-n-busted” theory, and is based on the design by N6BV in the ARRL Handbook, as well as some input from K4QPL. In summary, it is built around the use of an LPT port for computer control of the CW, PTT, Radio A/B, and band data. As previously [...] After building the 80m/160m splitter, it seemed like the signal levels from the K9AY were down a bit, probably from losses in the filters. So after looking around at pre-amps, and procrastinating on buying the Ar2 preamp, I again landed on the W7IUV site. W7IUV has updated his preamp schematic, and it looked easy enough. Building [...] Some suitable and inexpensive parts for future projects. A continuing aggregated list of Stuff I Use To Play Radio. Small signal DPDT relay: (For K9AY et al, & 12v control switching) Axicom V23105A5003A201 TX Antenna switch relays: P&B RTB14012F(SPDT, 12A), RTD14012F(SPDT, 16A) edited and amended11/02/2009, kaz Here is a small project that will work along with the K9AY RX antenna, and solve a minor SO2R problem in the KazShack. Currently theK9AY feedline comes into the KazShack directly to the RX input for one of the transceivers. I wanted to have a way to share the antenna between the two [...] Part 5 of the W4KAZ filter project series discusses filter losses, an idea for getting a very rough S-meter calibration, and trying to estimate the out of pass band attenuation provided by the filters. The Losses: The filters do have losses in the pass band. This is known as the insertion loss, and is reported in db. [...] Part 4 of the W4KAZ filter project series comments on the process leading up to the integrated box full of NVARC Ugly filters for use in the KazShack. The quest continues. Notes: Link to photos of the project at bottom of this page. If you want to read about the project from the beginning, go [...] So, a long hiatus between band pass filter musings. In Part 1, I laid out several reference sources for band pass filter projects. Part 2 details the decision process, plus some notes on what happened with initial attempts at reproducing the K4VX Filter and NVARC filter projects. Here I have a bit more detail on [...] A little look at some interesting remote switch projects. Far Circuits has the KO4NR project from QST, April 05antenna switch project. It is the circuit board and a full set of the required Zettler relays(az755-1c-12DE). A six position remote switch for only $36 plus shipping. Not bad. It is listed under “Repeater, Controller, and Station Accessories”. Also [...] Obtained a third hand Array Soultions SixPak from N4YDU. The control box needed a wee bit of refurb. The LED indicators were not all working, although the switch itself is functioning well. One LED was cracked, three others blown, along with four of the resistors. So, heating up the soldering iron and pulling a few parts [...] The shack is still in disarray but there is light at the end of the tunnel. The acorns are raining down like hail, so the leaves are not far behind. It is time to wrap up the shack re-assembly before leaf raking(and contesting!) season arrives in earnest. I need to keep the leaves from carpeting [...] |
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