Qex 1
heat sink which greatly reduced the case temperatures thereof. In addition, I heat sinked the driver transistor, Q404, to cool it down. Stability of the VFO was greatly improved by soldering one end of a short piece of wire I used a thin braided wire like Soder-wick to the frame of the variable capacitor C1 and the other end to the VFO shield. This was suggested in Refs 1 and 3 and it went a long way in making the HW-9 easy to tune especially when using the narrow filter. One very annoying...
Nkk Talks About Future Pacsat Pbbs Operations
AMSAT-NA Area Coordinator Jim White, WD0E, has asked some questions of interest to OSCAR satellite users about the PACSATs and AMSAT. Software engineer, Harold Price, NK6K, has responded with the following answers. WD0E Which PACSAT will commence PBBS operations first NK6K UO-14 is now about 80 functional with the PBBS software. AO-16 will be brought to that level, then LO-19. WD0E Will the TLM or Whole Orbit Data WOD format, frequency or any other parameters change NK6K This is more of a...
Networking Conference Proceedings Available
The ARRL CRRL Computer Networking Conference was held in London, Ontario, Canada on September 22. The proceedings of this ninth edition of the conference are available now from ARRL HQ for 12.00 plus 2.50 3.50 UPS for shipping and handling. The papers contained in this year's edition are 9600 Baud Operation by Phil Anderson, W0XI, and Karl Medcalf, WK5M Digital Regenerator Modification for the TNC-2A by William A. Beech, NJ7P, and Jack Taylor, N700 Considering Next-Generation Amateur Voice...
Amateur Television
Sensitive GaAsfet converter tunes 420-450 MHz with 25 dB gain Two frequency gt 1 watt p.e.p. transmitter properly matches linear amps with adjustable internal sync stretcher amp blanking level set Full 25 kHz dev. broadcast standard 4.5 MHz sound subcarrier 10 pin VHS color camera and RCA phono jack camcorder or VCR inputs, type N antenna input, and F TV output connectors Transmit video monitor outputs to camera and phono jack Small attractive shielded cabinet - 7 x 7 x 2.5, 11b 10oz. Just...
Info Nck
Gulf Coast Packet Assoc. Mobile. 205-476-4100 Arizona Ham Radio Outlet Phoenix, 602-242-3515 Ham Radio Outlet Anaheim, 800-854-6046 Anaheim, 714-761-3033 Ham Radio Outlet Burlingame, 415-342-5757 Ham Radio Outlet Oakland, 415-534-5757 Ham Radio Outlet San Diego, 619-560-4900 Ham Radio Outlet Van Nuys, 818-988-2212 The Radio Place Sacramento, 916-441-7388 Delaware Delaware Amateur Supply New Castle, 800-441-7008 Amateur Electronics Supply Clearwater, 813-461-4267 Amateur Electronic Supply...
Down East Microwave
Amateur Microwave Antennas and Equipment beam scatter redirection. One particularly interesting method of beam blockage is by use of a mirror cemented to the cone of a speaker the angle of beam reflection varies with the speaker drive both amplitude and frequency . Another interesting shutter is a chopping wheel a circular fan blade with periodic apertures, which can chop the beam into pulses. In fact, this method is the most used as the chopped beam can convey intelligence by small changes in...
Qex
The London Regional Art Gallery and Museum, overlooking the Thames River in London, Ontario, might seem like a strange venue for the ARRL CRRL 9th Amateur Radio Computer Networking Conference on September 22. It couldn't have been nicer. CRRL Vice President Harry MacLean, VE3GRO, and David Toth, VE3GYQ, were responsible for the hosting and moderating of the conference. If you attended, you might want to take the time to give them your personal thanks for a job well done. A list of the papers...
Cw 8-pole Crystal Filter
As mentioned above, I could not rely on the output meter to indicate the relative output power of the HW-9. The main difficulty with the output meter was a sudden jump of the meter to near full scale as the output power was increased. Correspondingly, the meter indication would not drop until the output power was nearly zero. The actual output power, as indicated on a watt meter, did not match the output meter's indication. This phenomena occurred mainly on the 80- and 40-meter bands. The...
Prod Det 1
Fig 4 Opposite page Schematic of the 8.8-MHz IF AF board Z5 . The trimmer capacitors must have 0.2-inch lead spacing to be used on the author's PC boards. C4, C6, C15 Ceramic trimmer, 9-50 pF Mouser 24AA024 . C35 Ceramic trimmer, 3.5-20 pF Mouser 24AA022 . L1 40t no. 26 enamel on Amidon T-50-2, center-tapped 8.6 fiH Q i 160 . T1 Secondary 40t no. 26 on Amidon T-50-2 primary 4t 8.6 H Q i 160 . T2 Secondary 27t no. 26 on Amidon FT-37-43 primary 9t. T3 18 turns no. 28, trifilar, on Amidon T-50-2....
Sarex Packetradio Logs And Qsls
There have been several questions concerning the logs and QSL cards for the STS-35 SAREX packet-radio robot. Stations making successful two-way contacts with the robot will know they are in the log when their call sign and QSO serial number is sent in the QSL beacon WA4SIR gt QSL , which lists the last 22 contacts. The QSL information for the last 600 contacts is saved in the TNC's RAM and these logs will be dumped frequently to the laptop computer in the orbiter. If you work the robot several...
Kantronics V Firmware Ready
Kantronics recently announced the release of firmware update version 3.0 for the following Kantronics KAM, KPC-2, KPC-4, KPC-2400 and KPC-1 TNCs. The firmware upgrade includes several major features Reverse-forwarding of personal messages, Host Mode, AMTOR-625 KAM only and NAVTEX AMTEX KAM only , and New commands that allow flexible use of command parameters. The PBBS in all units now supports reverse-forwarding of private and traffic messages. Enter your messages into your mailbox, then...
Complete Cm Atv Station
optional 50 watts RF out. Mirage D100TVN 319 optional 50 watts RF out. Mirage D100TVN 319
QEX Sbb
R349, and R351, it couples to the inverting input pin 6 of U304B. A 0.047- iF capacitor is added from the junction of R348, R349, and R351 to ground to achieve the second-order characteristic. The resulting low-pass filter has a cut off frequency of about 1.4 kHz. Note that capacitor C336 should be reversed per Ref 3 and the capacitance thereof increased to 3.3 xF or more for better low-frequency response. In Ref 2 an elaborate design is presented to remove an annoying audio thump when the HW-9...