As far as stable … iv seen the signal stay some what stable … it does not drift 100Khz but more like 20khz over time.
There would be no Doppler shift … antenna and HB100 were stationary.
HB100 antennas are pair of dipoles (radiating squares?) with no reflector … the signal did drop some, just not as much as i thought it should – as you too – but i think there is also reflections from around the room being picked up. — with that comment, i really, really really need to modulate the signal with SOMETHING to know for sure the source …
I threw away a walkman couple of days ago (been cleaning out the garage as you can see in the video) … need to dig it out and use that with a pot and place a resistor in series with the 5V source …
No … seems stable as long as hte temp stays constant and you dont bump/vibrate the HB-100 !!!
Big note on “DONT BUMP/VIBRATE” … you’ll see …
I had problems at first … dead car battery, pulse noise from the battery charger , vibration from the CD spinning around making the HB-100 jump around 15Khz …
I did a bit more testing today. I separated the signal source from the LimeSDR by 20’.
Using just a WR-90 transition in to the Lime, I can see a signal about 20 dB out of the noise. At this level, I’m just starting to see the phase noise on the edges. The CW does sound OK.
I then changed out the transition for a 25 dBi 10 GHz Flat Panel. MTI MT-9010. Signal level jumped about 20 dB, but so did the phase noise to the point that the CW was no longer clean. Raspy. I was able to clean it up by reducing LNA gain on the Lime. No way this would survive on a Mountaintop during a contest.
By comparison, I used my $7.95 Avenger PLL321S and was able to see a clean signal over 70 dB louder easily. I used the LimeSDR as an IF.
Using the LimeSDR for receive on 10 GHz is an interesting experiment, but I don’t see me using it for 10 GHZ receive. It would be better utilized as an IF at 618 MHz on the output of an Avenger or real 10 GHz rig.
Is the I/Q balance good with your setup @ 10Ghz …?
I still need to see if there is a way to manually set I/Q calibration … at about 1.5Ghz the I/Q starts to show that it needs better adjustment and DC hump is no longer removed.
I wonder if the noise floor and phase noise would be cleaned up any too.
Lots of information in it … but nothing about the internal parts/schematic. nothing of what value the DC blocking cap to the LNA is thats reducing the overall 100Khz performance nor the equal part ## used in the LNA or its S parameters (not that i can deduce anything from “S” parameters anyways)
I think i asked those questions awhile ago and were un-answered (i think)
N1JZE Double check that LPA …
I have 4 now … im not saying its junk … but the take off angle seems to be at ~25deg … so putting the waveguide to coax transition directly inline will not get you anything …
I built a ltc5508 power detector and took me a while to figure out the PLA pattern is NOT pointed off of the front of it …
Had an idea … , i can still detect 10ghz signal with no antenna … my lime is not shielded
Thought I might play around with this little bit again now that I’ve settled down after my wife telling me she wanted a divorce … that’s probably going to happen in about 12 days . I’m praying that my marriage be reconciled with my wife but she is still saying that her friend that she stays with every weekend is just a friend. I guess when you start lying to your spouse you just can’t stop doing it.
If you pray to God, believe in Jesus Christ … please pray for my marriage.
Still trying to figure this out off and on it’s clearly being picked up by the lime but the signal is affected when you cover the patch antennae but it seems that it is picking up signal elsewhere. I need to get my lime shielded and get a better idea of exactly how the signals getting into the limeSDR
