lazydamon

RF, SDR, antennas, satellites & shortwave. WhatsApp channel—come explore and join:

[lazydamon @lazydamon789]

@jamiemillington Manchester to Kuwait on 10m! That’s a lovely opening. 73!

[lazydamon @lazydamon789]

@cqcqcqdx That's quite a pileup! What band was W100AW on when those European stations were calling? 73!

[lazydamon @lazydamon789]

There are so many tall buildings nearby that I really couldn’t find a better reception spot on campus. The elevation angle was 25.5° this time. Hopefully, I’ll get a better signal next time!#SatelliteReception #Antennas #SDR #SSTV

[lazydamon @lazydamon789]

26 GHz crosses vacuum; satellite 5G needs engineered links.

[lazydamon @lazydamon789]

@W6MOQ @LilithDatura @djr100dx @LU4AA @HamRadioWayback What a beast! That IC-701 and Alpha combo has some serious vintage charm.

[lazydamon @lazydamon789]

Neon indicator bulb #RF #TestEquipment #Electronics #NeonLamp

[lazydamon @lazydamon789]

Not much activity yet, but for now it looks pretty clean.#AmateurRadio #HamRadio #AmSat #RFTesting #Electronics

[lazydamon @lazydamon789]

@K4KHOMetroATL @N4JAW Looks like a great setup for the Bronco. My main concern would be airflow—especially during long, high-power transmissions in a closed box. I’d check the ventilation and operating temperature before buying.

[lazydamon @lazydamon789]

@Alacritic_Super Cool project! The ESP32 is the brain, but the antenna and RF path decide what it can actually hear.

[lazydamon @lazydamon789]

@halfday_off Interesting idea! What band is it for, and how will you connect the aluminum wire?

[lazydamon @lazydamon789]

@riprap1 The military-aircraft mode sounds interesting. I wonder how many actually appear, since some military flights limit or disable ADS-B transmissions.

[lazydamon @lazydamon789]

@GIFURV455 What frequency and mode was this on? The regular intervals and frequency shift may help identify the interference source.

[lazydamon @lazydamon789]

@PaivanMajakka Nice demo. For bench testing, a 50 Ω dummy load would make the setup safer and more repeatable.

[lazydamon @lazydamon789]

@f1ulq @ref_info @F4IZC @F4EED @F4ASS @CarstenGrn1 @BoscoMac Very nice work. Will you share the VNA sweep plots and the final TX/RX isolation once the TX path is tuned?

[lazydamon @lazydamon789]

435 MHz LEO SSTV noisy with a “high-gain” rooftop vertical? A 3–5-element Yagi can improve SNR by focusing on the satellite and rejecting noise—if pointed, polarized and Doppler-tuned (≈±10 kHz). Verify mode/frequency, record audio, follow local rules. #SSTV #SDR #AmateurRadio

[lazydamon @lazydamon789]

@VE7PTN Low passes, terrain blockage and power-line noise can make FO-29 especially challenging.

[lazydamon @lazydamon789]

6.Add a notch/target-band filter near the SDR; check passband, impedance/connectors/loss. Run A/B/A 3×. If noise/false signals fall and SNR/decoding improve, diagnosis is reliable. Use only enough attenuation. Never test an unknown TX feedline: strong RF can damage the SDR.#SDR

[lazydamon @lazydamon789]

1. Small SDR whip → rooftop wideband antenna: waterfall fills with “signals,” yet aviation/amateur stations sink into noise. The antenna may not block weak signals; it may feed the RF environment into the receiver. Optimize SNR, intelligibility and decode rate—not the S-meter.

[lazydamon @lazydamon789]

5. Run a gain sweep. If lower RF gain drops the noise floor, restores the weak station and clears overload, compression is likely. Then test Direct → known attenuator → Direct. If level drops but SNR improves, that is strong overload evidence.