Hi Alan and other Rx stations, The audio frequency is unimportant, but please make note of the expected center frequency and sideband, as I don't have a good way to search for these signals. Unless t
Hi Jim and Wolf, Many thanks for the offer. One more request -- if it's perfect copy, please reduce Tx power so that there are some errors :) Data from other Rx sites will also be greatly appreciated
Hi all, I am looking at possible decoding algorithms for Jason or for future M-ary FSK systems. I'd very much like to test them on real world data. Does anyone have recordings of Jason signals that t
The typical Doppler at end-of-life of a GEO satellite is about 40 meters per second. That translates to about .02 Hz at 136 kHz. I don't know what can be expected at midlife, perhaps an order of magn
Hi Wolf and all, The SNR of the LORAN lines in the receiver's passband makes it difficult to track them, and as I understand it I need two of them separated by a couple of Hertz to use them to calibr
Hi Wolf and all, With some additional programming, it should be possible to eliminate most or all of the special hardware. That might let you get a number of folks to participate in reception. One po
Hi Stewart, This is a Motorola TTL dual 4-input mux, originally from Fairchild. The 9300 series is same spec, except only 0 to 70 degree temp, probably adequate for your purpose, and much easier to f
Hi Johan and all, does your Jason decoder try to keep track of symbol timing or does it only wait looking for the next transition (as the native decoder)? It averages over the last 16 or so symbols (
Hi Jim and all, BTW, when watching the decoder in action, "G4JNT" first decoded correctly, then the decoder retrospectively blanked out the "G" - On the whole, I think it would be useful if the decod
Hi Jim and all, I suspect that the aliasing problem may not be in the sound card, but rather in the driver's software sample rate conversion. Most recent Windows systems are set up to always run the
Hi all, An S&H with 1 us sample time and 100 us hold time is very easy for today's parts. The state of the art is several orders of magnitude better for both parameters. Take a look at this A/D with
Hi Alan and all, Virtually all modern sound cards do sigma-delta (sometimes called delta-sigma) A/D conversion. See http://www.rmsinst.com/dt3.htm for a good introduction and http://www.innovative-ds
Hi Peter and all, Although a FET normally "blows" shorted, if the circuit that it is in permits a huge current to then flow, the internal bonding wire will act as a fuse and the final result is an op
Hi Alan and all, Hi all, it would seem that though not being sent through the Reflector, some reflector member's PC has been infected and is sending out quanties of infected mail. The message mention
Hi Hugh, You don't say what other instruments you have available, but here are a few suggestions: 1. Measure the RF voltage across the dummy load with a scope. Determine current by knowing or measuri
Hi Andy, Jim and all, This is a great question, because it tells a lot about the background of the person answering, even if the answer is "correct". The engineer will say that most of the "missing"
Hi all, The infected message certainly has nothing to do with Rik -- the From: address is forged. Hugh is also correct about the fen-net.de origin. There are three things about a Bugbear message that
Hi Steve and all, I suspect that these propagation peaks that last two hours or more are accompanied by relatively stable phase delay. If so, coherent detection using a carrier recovered by e.g. an h
Hi Jim and all, Well, I admit to not having any solid data on the subject, and was hoping to get some feedback from the propagation experts here. The HBG signal would not be used to predict the absol
Hi all, I believe that you have all the elements here to make a system that can work at "any" SNR, i.e. a QSO could be completed even when propagation is poor, it would just take longer. The basic id
