A bit more work, but I break the trace from the relay's switching transistor collector and bring it out to the amplifier keying jack. In some cases, I've replaced the switching transistor with a hig
$1699." I think Barry is right. The IC-7300 is now selling for $1350, TS-590SG at $1280; FTDX-3000 and FT-991A at $1480. Some of the ANAN product line has seen a significant drop in price. It's a ve
I think there's been some very valid points made in this discussion. Either go head-to-head with price/performance of the SDR competition, or offer a very high-end analog rig and promote it as such.
Ladder and Cohn IF filters are easily made with 6-8 common HC-6 or HC-49S crystals. In production quantiles, these should be no more expensive than the original Ten Tec IF filters modules. https://ww
And make it LDMOS with an external, optional 48V supply. LDMOS devices using "bolt-on" machine screw blocks onto the PC board -- no de-soldering when replacing. The buyer can then select a mating TT
bring both companies back from the brink. The important thing for Ten Tec is for the sales of new equipment to resume. And the same for Alpha." FWIW - I had an Alpha parts order fulfilled a few week
6+, which has perhaps the best front panel EVER. FWIW, I've owned them both for many years." In eight years of using a K3, I still cannot get the band and mode pushbutton sequence correct. 8/10 time
that is 140 dB signal above one LSB using a 16 bit A to D." You're incorrectly applying bit strength based on strictly on voltage. We cannot use the classic format for dynamic range where DR = 20 lo
"Alas, no schematics so no chance to pick their brains without buying one. This I will not understand. If someone is going to copy your product, they will not be deterred by lack of a schematic." The
Jim, Good points, although as I look at the HEROS passpand plot -- and although it may first appear wide on the graph, it looks reasonably close to the preselector response we see from Collins 75S or
become an overnight success." Far from overnight. Prior to the formation of Elecraft, they began with club projects for NorCal. As far as I can recall, Wayne started with the design of the Safari-4
Allan, Switchcraft makes a 1/4-inch jack with a long bushing. The stereo (tip/ring/sleeve) version with N.C. contacts for a speaker is the model L114BX: http://www.mouser.com/ProductDetail/Switchcraf
Jim, If you're interested in a premium T/R relay, Gigavac makes the GH-1 model and is identical to the Kilovac HC-1 and Jennings RJ-1, all of which have been time-tested over several decades. Gigavac
Rick, et. Al... The HF115F-H-012-1Z relay has a substantial max. make time of 15 msec., whereas the GH1/HC1/RJ1 are rated at 6 msec. maximum and are typically 1-2 msec. Even if the typical make time
"Many years ago, I carried around a set of crystal headphones in my toolkit when I worked on troubleshooting audio systems in buildings. " Jim, for this reason I still use a Harris telco "butt" set i
Rick, Nice discussion on your website. I'm presently using a symmetrical switch-L tuner at my home QTH. It's mounted outside the shack in a pressurized NEMA enclosure. A 1:1 choke is placed on the in
Shortest lead lengths. This concept closely approximates a single coil plug-in jack bar. B&W once made a similar device for PA output networks in the pre-WWII era when just about every stage from os
Commonwealth Office for use in overseas embassies - this was one of the plug-in coils: http://www.karinya.net/g3txq/temp/coil.jpg. Steve, Looks like it used BC-610 coil sets? If not, they appear nea
It may model that way but at 475 kHz, surface wave propagation will likely dominate and the vertical may be the better performer, especially with a large top hat. IOW, feed that 1000 ft, 50 ft high