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2300khz radio show?
With my newly and properly grouned transmission line to my 13 meter
test random wire, I can now hear the lower frequencies like never before. Whats the religious radio drama on 2300khz at 0330 UTC? could it be a new pirate or WWCR/WUN? Should be USACE on that frequency. mike |
mike wrote: With my newly and properly grouned transmission line to my 13 meter test random wire, I can now hear the lower frequencies like never before. Whats the religious radio drama on 2300khz at 0330 UTC? Sounds like a strange signal for that freq. Could it be a harmonic (or rx overload) from an AMBC? |
Next time you hear it, check your loudest local AM stations ... maybe overload
from your superduper antenna. jw wb9uai |
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A passive preselector between your antenna and radio would be better, that way
you're not throwing away 20db for hearing the good stuff. Now 0645z and 4845.0 MAURITANIA is peaking S9+40 db !! WOW ! jw wb9uai milwaukee |
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Cool, that beats my picking up 50 kw Radio Orbita 3 from Russia or the African channels (Botswana and Nigeria) booming last night. Not bad for a sony 7600GR portable eh? I figured out the image problem. I think it's the voltage limiting diodes I place yesterday across my antenna input to ground. mike That is exactly what it is assuming yor RX uses a 455 kHz IF. 3210 -(2X IF)=2300. Diodes across an antenna are always a bad idea. Dale W4OP |
take half the HF frequency, and tune to the corresponding am station - it
might be them s. |
Mike,
Having some form of Antenna Input Protection is a Good Idea. - - - Instead of a Single Diode: *--|--@ * = Ground -and- @ = Antenna # 1. Good - Try a two sets of Double Diodes. *--|--|--@ *--|--|--@ # 2. Better - Use a Gas Discharge Tube (GDT) for EMF shunting and a 10K Ohm Resister for Static Electricity Bleed-Off to Prevent Static Electricity Build-Up and Discharge. *----(o----@ *--\/\/\/--@ # 3. "Best" is an Improvement to #2 would be to replace the 10K Ohm Resister with a with a 10K Audio Taper Potentiometer. + One Leg/End goes to the Antenna. + The 'other' Leg/End goes to Ground. + Then the Center of the POT goes to the Radio. + The Radio's Ground is also connected to the common Ground. NOTE: The 10K POT now acts as a Bleed Resister and also an External RF signal Attenuator. *----(o----@ *--\/\/\/--@ *====^=====@ *====| *====R R = Radio iane ~ RHF .. .. = = = mike = = = wrote in message . .. Sony 7600GR portable I figured out the image problem. I think it's the voltage limiting diodes I place yesterday across my antenna input to ground. mike |
*cough* NE-2 bulb *cough*
;-) -- Gregg *It's probably useful, even if it can't be SPICE'd* http://geek.scorpiorising.ca |
Dale Parfitt schrieb:
Cool, that beats my picking up 50 kw Radio Orbita 3 from Russia or the African channels (Botswana and Nigeria) booming last night. Not bad for a sony 7600GR portable eh? I figured out the image problem. I think it's the voltage limiting diodes I place yesterday across my antenna input to ground. That is exactly what it is assuming yor RX uses a 455 kHz IF. Which, btw, it does. And it doesn't have too great an image rejection either (~40 dB). When using a big antenna with a 7600G(R), I'd advise a passive preselector / antenna tuner, not only for better image rejection but also against IM products (here in Central Europe signals are strong enough to produce IM products on the whip alone). It's a lot of receiver for the money, but in no way an AR7030+... (Except for AM demodulation, that is - this sounds rather crappy and distorted on the AOR, but that's what the excellent synch is for.) Stephan -- Home: http://stephan.win31.de/ | Webm.: http://www.i24.com/ PC#6: i440LX, 2xCel300A, 448 MB, 18 GB, ATI AGP 32 MB, 110W This is a SCSI-inside, Legacy-plus, TCPA-free computer :) Reply to newsgroup only. | See home page for working e-mail address. |
On Wed, 24 Sep 2003 15:47:10 +0200, Stephan Grossklass
wrote: Dale Parfitt schrieb: Cool, that beats my picking up 50 kw Radio Orbita 3 from Russia or the African channels (Botswana and Nigeria) booming last night. Not bad for a sony 7600GR portable eh? I figured out the image problem. I think it's the voltage limiting diodes I place yesterday across my antenna input to ground. That is exactly what it is assuming yor RX uses a 455 kHz IF. Which, btw, it does. And it doesn't have too great an image rejection either (~40 dB). When using a big antenna with a 7600G(R), I'd advise a passive preselector / antenna tuner, not only for better image rejection but also against IM products (here in Central Europe signals are strong enough to produce IM products on the whip alone). It's a lot of receiver for the money, but in no way an AR7030+... (Except for AM demodulation, that is - this sounds rather crappy and distorted on the AOR, but that's what the excellent synch is for.) Stephan Hmmm...guess the diodes are not such a hot idea after all. Easy enough to desolder and remove them. That would leave my 2.2k ohm resistor as a bleed off inside my antenna tuner. I will order a gas arc breakdown tube for major voltage impulses and be done with it. Or alternately, should I run into a pile of cash sometime soon, buy an ICE model 197 RF limiter/arrester. mike |
"mike" wrote in message ... he,he Yes, I think the antenna has something to do with it. It was WWCR on 3210 causing a harmonic (?) on my sony. Thats nearly 1khz off. This happened several times tonight with those domestic based powerhouses. It could be mixing with a local AM station. 3210 - 2300 = 910 khz. Of course if that's the case you should probably be able to hear the programming from both stations at the same time, as I have with local AM stations. -- Tom Sevart N2UHC Frontenac, KS http://www.geocities.com/n2uhc |
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