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baron von vulpes

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About baron von vulpes

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  1. Having several emails now, discussing with Tony Parks about using his small receiver for 20.1 MHz he will send me a a ready build one for evaluating. He have a moment only one x-tal for that specific frequency he can only make one at moment. But if more of you are will like to order from him later, he will sell them for $32.00 each, that is a very good offer. He will also sell kits, $22.00, but is it make uses of SMD components it is not for me. I think in combination with the active antenna Philip is experimenting with, this will make a "rock" good JOVIAN receiver. Best Regards Jogeir Lindse
  2. Philip. The active loop is a very good idea I think, haven't read about any body that have done this before, are use using it with the diamond shape as well? Measurement of the sides? And how high up from the ground do you plan to put it up, got interested in this one Post a picture when you get it up! SDR receivers, what about modifying a Soft Rock Lite II, change the x-tal and modify the band pass filter to center frequency of 20.1 MHz? "A crystal of about 26.8 MHz would give a 1/3 sub-harmonic sampled center frequency of 3* 26.8 / 4 = 20.1 MHz. For higher frequency use, 1/3 sub-harmoni
  3. Philip, yes you can have a lot of fun with those TV tuners, planing to have one more in the same box, an analog one. Will see what I will use it for, Antenna Analyzer? An ADC will go in the box as well, software I do not know yet, any suggestions? And the first target goal will be Cassiopeia A, the strongest radio source aside from the Sun in the sky. Will sooner or later need a LNA as well, did not find any good project so far. A nice SDR receiver is definitely on my wish list, but I have a couple of project going at the same time all ready now, so later. Guess you can call those
  4. Hello Everybody. While waiting for the parts for the new 30v power-supply I continue studies of those very interesting TV tuners. You can also make a Radio Telescope (wide band receiver, spectrum analyzer) by savage an analog tuner from an old TV set or a VCR. In a simple way it can be done like the attachment picture here. But in practice you will have to use two ten turn potentiometers, 10k coarse, and a 500R for fine tuning. IF out goes to the detector and a DC amp, ADC and then to you computer. Adding a sawtooth sweep generator to VT will make it a simple spectrum analyzer. There are pro
  5. Everybody! Well, I think I will scale down the Log Periodic antenna a bit, the tuner tunes from 55 MHZ to 860 MHz, but even that will be a quite big antenna. 18 element, Axial Length: 4.522049174202821, Longest element: 3.30444441. May be, as Philip suggested, an UHF TV antenna will do the trick? Even though it is not covering 408 MHz. Channel coverage:21-69 Frequency range: 470 - 862MHz Antenna gain: 14-16 dB Beam width (degrees): H30 / V33 Front - back ratio: 26 dB Impedance: 75 ohm Antenna length: 2210mm £ 49.00 from Maplin The uhfscan.bas program from MTM Scientific runs from 473 to 80
  6. David, frankly, I do not know what is best, so I have to start somewhere, can you tell me why you will prefere cross-polarized before a yagi or a log-periodic antenna. All the papers I have been reading they are using yagis, quagis or log periodic antennas, "The Mauritius e-CALLISTO Helioradiospectrometer" (phu) using the antenna I am planing to copy. See the link to the pdf file on my other posting earlier today. Frequency rage from 20 - 860 MHz. Umm, maybe I can use this for JOVIAN on 20.1 MHz too... Please keep on giving input and suggestions, that what this forums are for, teach what you k
  7. Derek, Philip Yes sure is fun to play with those things, especial this one as it is so many thing you can do with it beside using it as a Radio-telescope, you can use it for a Spectrum Analyzer to scan the frequencies of your interest. I am going to do both on the same unit, switch the PICAXE. The red wires are for the AGC, puting 12v to the SIF, VIF unit as shown, will disable the AGC, you can also use a potentiometer to make it stepless. As you can read from their homepage, there is not so much to it to reprogram the PICAXE for scanning or program it for an another frequency. Can do a lot o
  8. Everybody. The project is going slow and it have been changed from 408 MHz to 611 MHZ. The tuner board kit from MTM Scientific has arrived, time to plug the soldering iron. This is a nice and simple kit, it can be classified as a beginners kit, anyone with just a little soldering experience can put this together. Regards Jogeir Lindseth
  9. Hello every body! Looking now for a LNA to start my All Sky Survey project, anybody know of a circuit description, and what are other using? Regs Jogeir
  10. One thing is to calculate the resonant of a coil\cap, you have a clue where you maybe are, but measuring it would be better, as Philip say "They can have quite fine tuning these big loops...." Hook up yout Sinus generator, scope and frequency counter in parallel over you loop\cap and tune your generator until you see that you have resonant on you scope and read the resonant frequency on your frequency counter. Guess most of you are "optical" astronomers so you do not have those instrument, but all these is so cheep second hand now on eBay and othe places, so most hobbyist (including me) can a
  11. Philip, thank you for the information. Are you using polypropylene capacitors there. I saw some were how to find the resonant frequency of a loop/cap like this, but I forgot where and how. Link up a JOVE and a SID receivers like this seems like a good idea SOLAR RADIO TELESCOPE Regs Jogeir
  12. Philip, yes it sure is, like to do lot of this stuff. We do have a nice place (and 'electric noise' quiet, house, and the shack and tower for water tank, and a big 10' x 10' platform up there for antennas) in the Philippines, not 100% finished yet, but it soon will be. At present I am in London, as it is wet season in Asia, but going back soon. I do have a VLF-3 receiver, but would like to do some SID logging as well. Can you please post some details about your SID loop antenna, and how you connect it to you PC, isolation transformer, amp, ADC? I do have a FT-857 so i can use it for 408 mhz, a
  13. Hello all. I have been thinking of building a 20.1 mhz rx for JOVIAN for quite a wile now, been considering kits and the project that Philip is building now. But lately I have got more interesting in, as i study it, building a "408 MHz All Sky Survey" radio telescope, there are tons of material out there about this subject. Have any body here build a system like that? I came across this project: Link Amateur Radio Telescope Plans Can be build for a reasonable price for an hobbyist. Here is one that can do the most, more work, more expensive: Link Science Workshop Quoting: "YOU CAN ALSO USE THI
  14. And here is one more 20.1 Mhz receiver, kit or ready build. Looks nice, and have a build in frequency display too. Galileo:: 20.1MHZ Direct Conversion Radio Astronomy Receiver For Radio Jove Regards Joe
  15. Sky Beast, yes you can on any rx you can tune to 20.1 Mhz But all you guys how are interested in radio astronomy and have a little know a little about electronic, take a look at this one: Science Workshop Publications Department Build a radio telescope on any frq you like from this one. Here is yet another one, simpler: CATV Tuner Amateur Radio Telescope Plans Spectrum analyzers has been out of reach for me, very expensive, but now I can have one AND a great radio telescope for a nice price. Think i will go for this one. (science-workshop) Regards Baron von Vulpes
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