Below is a bunch of various articles, which probably should have gone to a different page each, but I chose to combine them into one. I recovered the articles from the wayback machine as were previously published, but not much was left of them.
Actually, I had difficulties getting something meaningful from the site as I had earlier intended, but this was the best that I managed. Anyhow, I will be working to collect more useful information about the below topics, but in the meantime I hope that what I recovered is a good read.
Linear Amplifier: 6 AND 2 Meter Amplifier
There are lots of different 2 meter low-power rigs in use out there, ranging from hand-helds for FM, older multi-mode transceivers, and even the newer all-purpose types like the FT-817 or the Elecraft 2M transverters. QRP operation can be fun, but if you’re like me, you probably have the occasional need for a bit more power.
Below are graphics which detail the instillation of the amps in the best way to enhance there performance.
The article below was written byby N7ART. It details the Diagonal Waveguide Feed which can be used by most dishes. There was a PDF having the whole guide step-by-step, but I’m yet to recover it from the archives as was previously uploaded here. When I get it, it will be available on this page.
Dipole Assembly Front View
Diagonal Dipole Side View
Installation of Diagonal Feed
Weak Signal Generator: Boosting Weak Signals
This is a Schematic for a very simple Weak Signal source that I used for years. It work FB up to and including 10.368Ghz (432nd harmonic). Have not tried 24Ghz ( ;o}
I recommend 5VDC full size Computer TTL Osc rather than the CMOS versions that are now available. The TTL version produces stronger harmonics than the CMOS version.
Using a precision attenuator on the output it can be used connected directly to the DUT (device under test).
Microwave Power GaAs FET: MITSUBISHI SEMICONDUCTOR (GaAs FET)
Mitsubishi is one of the a leading supplier of high-performance gallium nitride (GaN) and gallium arsenide (GaAs) microwave devices that operate in S, C, X, Ku and Ka frequency bands. The company’s power products are used in wireless applications such as, SATCOM (SSPA/BUC/VSAT), microwave link (PTP, PTMP), RADAR, medical equipment, and industrial applications.
Mitsubishi recently introduced the development of Ka-band high power GaN HEMTs to support SATCOM applications and new efficient, high-gain power GaAs FETs, MMICs, and modules.
Millimetre Wave CW Exchanger
The Millimetre Wave CW Exchanger program was originally developed for the first EME 47 GHz QSOs, however it can be very useful in other situations when the signal spectrum is widened for reasons of the propagation (aurora, rainscatter) or if there is deep and frequent QSB signal fades (EME libration QSB, troposcatter on SHF etc.).
The program uses standard CW code and allows up to a ten times (10 dB) reduction in the threshold of readability for a signal buried in the noise. The program is based on the noncoherent averaging of repeating messages. More technical details about the program can be found in the MWCW Exchanger description document.
The installation is very simple. Install the program and start it from the directory of your choice. You should see a screen display similar to that shown in figure.
There are three (3) parts to the main screen. The upper part of the screen contains an oscilloscope. It allows viewing of the output signal after processing.
Below this in the middle of the screen is the multichannel signal strength indicator section. It contains an array of 90 large square pixels or “LEDs” with 18 LEDs in a row and 5 LEDs in each column. To the right of the LED array is the message panel, and every line of the LED array corresponds to a message line. Every column corresponds to the energy in a particular input frequency filter “window”.
The lowest section is mainly for the setting of schedule and signal processing parameters.
Operation & Use
There are three modes of operation within this program. The first mode is the processing of a received signal from a saved wave file. The second mode is the real time processing of a received signal and creation of a corresponding wave file. The third mode is the generating of a one tone or two tone CW signal for transmitting. The second and the third modes can be used the same time (Echo Test mode). This allow to get own echoes from the moon.
Processing of Wave File
This mode allows the analysis of signals previously saved as a wave file. The wave files can be created from real signal data or generated by the MWCW Simulator program. The MWCW Simulator program is able to test the decoding system for operation at various levels of signal to noise ratio.
In the Signal Source area of the lower window, switch the input from Sound card to Wave file. The Transmit button will disappear, and instead of the Receive button there will be a Load File button.
Before processing a file, it is necessary to do the following things:
– Type into My Call, the callsign of the first station;
– Type into To Radio, the callsign of the second station;
– In the middle window, just below the LED display, select BFSK mode if the saved signal is two-tone CW (normal mode for best weak signal operation);
– Select the proper Signal BW (frequency shift generated for BFSK by this program is equal to three x Signal BW);
– Set CW speed (12 WPM on default);
– Set Audio on to play the processed signal.
Click Load File and choose the file you want. Please see the result of processing a file with the real 47 GHz EME signal from VE4MA (Apr 12, 2005) shown in figure 2.
A bright “LED” indicator will appear in the LED matrix after processing the file. This shows the frequency “channel” (150 Hz wide for the selected 300 Hz signal BW) where a signal has been found. The LED will be brighter for higher signal strength. Click on the brightest LED and the output of the channel will be displayed in the oscilloscope section. The SNR (signal/noise ratio) of the signal in this channel is also displayed.
Component Cost and Source for new S/M Linear Optical Encoders to 16Bit Parallel Data DECODER Board
Qualities Shown for Major Components are for 1 (one) board
|SN74HCT573DWR —X 3||296-1210-1-ND||$0.50 X 3||DigiKey||Tri State Latch|
|CD74HCT14M96 —X 1||296-14548-1-ND||$0.44||DigiKey||Hex Inverter|
|CD74HCT02M —X 1||296-12825-5-ND||$0.44||DigiKey||NAND Gate|
|LN80C31BH1SF88 –X 1||809475-ND||$5.00||DigiKey||80C31-BH 44PLCC|
|11.0592Mhz —X 1||300-6024-ND||$0.88||DigiKey||HC49US11.0592MABJ|
|Varistor (MOV)— X 1||BC1500CT-ND||$0.39||DigiKey||
|$1.58||DigiKey||LINE RCVR DUAL EIA-422/423 8-SOIC|
|KT11P4CM –X 4||Part# 149948CL||10 / $2.60||Jameco||http://www.jameco.com/|
|DS1992-F5 –X 1||http://www.maxim-ic.com/quick_view2.cfm?qv_pk=2831||$2.78||Maxim Semi||Touch Memory|
|http://www.maxim-ic.com/quick_view2.cfm?qv_pk=2831||$1.50||Maxim Semi||Touch Memory Holder|
|Part# 232485CL||3 Pair Shielded Cable||$25.70||tp://www.jameco.com/||100′ reel .$25.70 Fully Shielded|
|EDC346442-ND||CONN CARDEDGE 44POS .125 X .250||$3.22||DigiKey||Card Edge Connector|
|399-1567-1-ND||T491B685K010AS||$0.24||DigiKey||CAPACITOR TANT 6.8UF 10V 10% SMD|
|10 / $ 0.94||DigiKey||CAP CERAMIC 18PF 50V NP0 0805|
|311-10KECT-ND||10 / $0.78||DigiKey||RES 10K OHM 1/4W 5% 1206 SMD|
|5.6K 1206 Resistors||311-5.6KECT-ND||10 / $0.78||DigiKey||RES 5.6K OHM 1/4W 5% 1206 SMD|
|929974-01-36-ND||$1.87||DigiKey||For Field Board|
Lastly this are the images of the previous owner of the site as well as those who contributed to this site in one way or the other through articles as well as sharing their immense experience about ham radios. Bravo to these heroes!
In the memory of Wayne Mills (center), who passed away in Dec 2011.