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the total length of a half wave dipole should be a half wavelength. so for 437.8 MHz, the total length (both sides) is 32.7 cm, and from center to one end is 16.3 cm. the short antenna fully extended has a total length of 32 cm, which should be close enough. the attached vna plot of the short antenn...

was able to decode Meteor M2 lrpt up until a month ago. now, its signal bandwidth has increased from about 100 kHz to 250 kHz, and the constellatiion has changed from 4 dots to more of a donut with a dot in the middle. unable to decode. am running dde client v1.2, demodulator v 2.3, and decoder v 5....

If you use a tripod for your v-dipole, you may have read that it should be 1 meter above ground. in my case, 92 cm gives nearly noise free reception above 15 degrees elevation. you should try varying your antenna height by 1 or 2 cm for your location. the ground reflection changes the antenna patter...

what program (e.g., sdr#, sdr console, hdsdr, sdruno) are you using for your radio? for step 1, when you run your sdr radio, look for a configuration menu (like a gear) that shows "quadrature sampling". if you click on the drop-down box, you should see something like "q branch". step 2 is the noaa w...

i don't have a mac, but you may be able to figure out how to do it by seeing how i do it on a pc. 1. you can tune your sdr below 28 MHz by direct sampling the Q branch. on sdr sharp, this means changing the sampling mode from quadrature sampling in the configure source menu. 2. go to https://www.nws...

you may have inadvertently created a ground loop and induced 60 Hz power into the system. try disconnecting the ground to the shield. i need to crank up the volume all the way in sdr# for a green signal of 75% in wxtoimg. if i lower the volume in sdr#, the level in wxtoimg also drops up to the point...

just reduce the volume in sdr sharp.

you're right about overloading causing the problem, since i live within a mile or two from am, fm and tv transmitters. am using both am and fm filters, but apparently they are overwhelmed by the strong interference. found that i get best results by using the am and fm filters without an lna, and by ...

recording of noaa 18 satellite pass with 67 deg max elev was unsuccessful. started off with fm trap to rtl-sdr LNA to rtl-sdr dongle running sdrsharp at 0 rf gain and got nothing but noise. looking at the attachment, the pass starts at the top. the black strip is when i turned off sdr sharp temporar...

managed to get bias_tee_on.bat and bias_tee_off.bat to work by changing -d 0 to -d 1 as suggested by github on mar 2, 2018. must be a windows 10 thing. i'll try to get a satellite picture again tomorrow. may have had the rf gain raised and overloaded. now see that raising the rf gain on the dongle d...