Hello, my name is Mariusz. I was born in 1967. I have been licensed since 1990.
I'm a big fan of working QRP CW (with 5 Watts or less). Since July 2013 the power of my station is always QRP or QRPp.
The station is quite basic. I using homebrew simple wire and vertical antennas.
Member of SKCC # 14331 (Straight Key Century Club). I'm still learning CW, so PSE QRS :).
My primary transceiver now. I built K2 in November 2014. It really is the perfect QRP radio. Crystal filter works perfectly! Audio filter (KAF2) also works great.
I made only minor modyfications: Improved low frequency audio (C25, C26 0.1uF --> 0.33uF on the Control Board and C12, C13 0.22uF --> 0.33uF on the KAF2 Audio Filter Board) and K6XX CW Indicator (CW zero beat detector).
- Ten-Tec Century 22 - CW TRX (model 579 from 1984) with Crystal Calibrator (model 226). Power levels ranging from a few mW to 5 W out max (I reduced max output power from 20W to QRP 5W by the new ALC level setting). I love transceivers prior decades.
I love this transceiver! Very fast, smooth QSK/full break-in. Perfect 4 pole CW bandpass audio filter (Ten-Tec Century 22 has a direct conversion receivers). Filter is inside the AGC loop and filter action does also impact the AGC action. It works very well! I bought this transceiver in January 2013.
- OHR 500 - 5 Band QRP CW TRX (kit from Oak Hills Research). I bought this transceiver in August 2013. I confirm reviews from eham.net. Lovely radio!
- Elecraft KX1 - QRP CW TRX with KXAT1 internal antenna tuner (80,40,30,20m; ~3 W out),
- PIXIE 2 (80m) - homebrew QRPp CW TRX with sidetone and BCI filter (80m; ~300 mW out).
- PIXIE 2 (40m) - kit from China. Full QSK QRPp CW Transceiver. TX frequency is fixed at 7.023,04 MHz. 600 Hz frequency shift (adjustable). PWR is 228 mW out @ 9V (360 mW @ 12V; 422 mW @ 13.8V). RX current: 12 mA, TX current: 102 mA @ 9V.
My mod: I added a simple RC lowpass filter at the input of audio amplifier LM386 (R = 10k, C = 22nF, cut-off frequency = 723 Hz). Now Pixie is much more selective. Ears are not overloaded now :).
- Homebrew GP for 20m band. Monoband vertical for 20 m band (full size λ/4 ground plane antenna with 7 radials λ/4 sloped down about 35-40°). No traps, no losses :). Aluminum pipe (from λ/2 CB antenna) ~5.10m long and stranded copper wire 4mm2 (~11 - 12 AWG) 5.15m long. Highly efficient antenna.
- Homebrew Fan Dipole for 40m and 30m band. Stranded copper wire 6mm2 (~10 AWG). 2 x ~10.1m and 2 x ~7.1m. Balun 1:1 (Diamond BU-50) and additionally current balun (ferrite beads on coax at antenna feed point). Antenna sloping at an angle of about 20-25 degrees from horizontal (10m up side and 2m down side).
Previously, I had the T2FD antenna (Tilted Terminated Folded Dipole), but even though T2FD is super antenna for noise urban jungle (better signal-to-noise ratio than a vertical or dipole) was too not effective to work QRP .
I prefer electronic QSL via LoTW, eQSL.cc or QRZ.com Log.
Never add /QRP to my callsign.
"SP2SWI" --> Yes | "SP2SWI/QRP" --> No
It's just a source of potential confusion (on LoTW, eQSL and elsewhere). My power is certainly QRP or QRPp (since July 1, 2013).
My lovely dog :)
Adjustment and modification of Ten-Tec Century 22 (Model 579)
Sorry for my English. :)
- Adjusting the "TX OFFSET"
I had to adjust the "TX OFFSET" trimmer potentiometer on the "RX / Control Assembly" because it was badly adjusted.
- Greasing the Ten-Tec Century 22 PTO
I do not know when the PTO was greased, so I decided to dismantle, clean, greased and reassemble again.
To remove the knobs are needed Allen keys (hex keys): .050'' and 1/16''.
Very helpful in removing the PTO is a guide written by Dave (N5XL, VE5AEA) "PTO Rebuild and Dial Restring for the Ten Tec 579 (Century 22) Transceiver": ttc22pto.pdf. Thanks Dave!
The next steps:
All elements of the PTO should be cleaned with a toothbrush, cotton cloth and isopropyl alcohol.
I used all-purpose lithium grease "MULTIFAK EP 2" from Texaco, because that I found in my garage :). "MULTIFAK EP is a multipurpose grease family made from refined mineral oils and a lithium soap. MULTIFAK EP greases offer great shear resistance, retain their consistency under adverse service conditions and protect bearings and other metal surfaces from corrosion when exposed to wet conditions. MULTIFAK EP greases are non-corrosive to non-ferrous bearing metals as well as steel. MULTIFAK EP contain extreme pressure additives as well as rust and oxidation inhibitors. MULTIFAK EP are recommended for both automotive and industrial purposes as multipurpose lubricating agents for friction pairs operating." I think it will work well in the PTO.
PTO lubricated. Now PTO works very smoothly and precisely. I hope that it will be a long time :).
It's time to check whether the PTO oscillates at least from 6.0 MHz to 6.5 MHz.
Done. Everything works fine.
- Modification center frequency of audio filter
I rebuild bandpass audio filter (audio filter between the detector and audio amplifier). Ten-Tec Century 22 has a direct conversion receivers and the audio filter is very important to ensure good selectivity. For me, the center frequency was too low.
I made the measurement. The center frequency was 510 Hz (bandwidth was about 250 Hz):
Input data for calculations:
Result of the calculation:
Standard E96 1% tolerance resistors: 210k/1%, 422k/1%, 20k/1%.
The next steps:
Done. The center frequency is 600 Hz (bandwidth is about 250 Hz). The filter works well.
7570446 Last modified: 2016-09-15 08:06:21, 64921 bytes
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