This brings up more memories of how I got started listening to radio. My grandfather was an EE who worked in the coal mines, and he had all the latest gadgets. I was seven years old when he died, and
Agreed on all counts. Several years ago, an engineer in the Alpha booth told me they use Gigavac. I've been using Gigavac as replacements for my TenTec amps for about ten years. I bought them direct
NO! Headphone impedance is NOT critical. Audio power amplifiers are VERY different from RF power amplifiers. Virtually all audio amplifiers are low impedance sources, and are designed to drive any im
In general, shielding is FAR less important than careful control of signal return paths. What EMC guru Henry Ott calls "the hidden schematic lurking behind the ground symbol." 73, Jim K9YC
On Thu,8/25/2016 2:16 AM, Barry N1EU wrote: Point of information: when I owned an Orion 565, I also used Sennheiser HD280 headphones. I needed to crank AF Gain to maximum to get decent volume. I spok
The connector on the Herc II is standard Molex, so simply order the right shell and pins. Pinout is listed in the manual, but it isn't stated whether the band data is a positive voltage or a pull to
3-phase power is not the universal blessing that you believe it to be. The overwhelming bulk of the power delivered to today's homes is to electronic loads, which draw highly distorted current, resul
I'm not sure what you mean by "intelligent power management system." But think about the fundamentals of how this might be done. You've got to reshape the total load current in each phase to make it
Hi Gary, I've written extensively about this in tutorials written for hams, and also for audio/video installation contractors. They're on my website. IMO, an extensive discussion is WAY off topic of
No, it has nothing to do with the SMPS frequency. An SMPS starts with a transformer/rectifier/cap, then goes to the SMPS where filtering and regulation is done. 73, Jim K9YC
Bandswitching cables are NOT required to make the Hercules II work. It works just fine with the mechanical bandswitch. Band decoding is simply a convenience. 73, Jim K9YC
The KPA500 is a very nice amp, and it has the big plus of working 6M. It's what sits on my operating desk instead of my Herc II, which is in my closet. But I keep it because it works fine and runs on
KENWOOD TS-590SG HF / 50 MHz 100 Watt Multimode Transceiver $1,309.95 This one is the winner at the price point, and by a wide margin. N0AX (ARRL Handbook and ARRL Antenna Book editor, also an excell
Not necessarily -- it depends on your style of operation and what else you own. My Titans will get within a dB of legal limit with 50W drive. It takes only 28W to drive my KPA500 to its full power of
On Mon,7/18/2016 12:25 AM, rick@dj0ip.de wrote: Roger, then let's stay with resonant antennas. The feedpoint impedance is not only dependant on the impedance of the antenna but also on the transforma
NO! The feedpoint impedance is AT THE FEEDPOINT -- that is, up in the air where we connect the feedline! And THAT is determined by the antenna, it's surroundings (soil, mounting height, other objects
RIGHT! The usefulness of very low antennas for short distance work is a MYTH. Slide 19 in this link shows that an 80M dipole produces maximum radiation at high angles (70 degrees) at 60 ft, and that
Why does it "seem" that way? Here's some actual science specifically intended on choosing between various antenna options. http://k9yc.com/AntennaPlanning.pdf One thing it clearly shows is that a GOO
Hi Carl, Remember that power on 475 kHz is defined as ERP, so loss in the system is OK if we have enough power to throw into the feedline! N6LF has been working on this and published something in QEX