Fonctionne parfaitementimages NOAA réceptionnées avec une V-DIPOLE et un RSP1A

Provato e riprovato ma non funziona. Genera solo un alto livello di rumore che satura qualsiasi ricevitore radio. Mi dispiace perchè ho letteralmente "buttato" nel cestino circa €50,00=, ovvero soldi buoni, non spazzatura come questo preamplificatore. VI CONSIGLIO DI NON ACQUISTARLO!!!

 

It works. watch your bias T and power options.

Works exactly as described

Awesome product. Made a huge difference in reception. :-)

de sawbird is een goede toevoeging bij de ontvangst van weersateliet op mijn locatie, waar ik door omstandigheden geen antenne op het dak of zo kan monteren

Call me the fool for purchasing four of these units, but I really wanted it to work. The seller did cover the first three with refunds, but this one slipped past the return period. The previous three were the deluxe model with the case, the last was the Barebones Model. Here is what I found on all three: (Disclaimer) - I am an experienced amateur radio operator with an extra class license. I am also a career telecommunications engineer that has 30 years of experience installing telecom systems in the field, including RF and Satellite. This review is based ONLY on my experience; while knowledgeable in this area, this review does not represent a professional opinion - Your results may be different.Here is my Test Summary:Equipment used:- Tested with an SDRplay RSP1A. in the shack. Windows 10 PC with low CPU usage and high RAM capacity- Unit was direct powered at the mast. DC voltage and milliamps were well within the stated requirements.- All connections were made using high-quality factory-made SMA jumpers from DXE. LMR400 connectors were high quality, cut and soldered to manufacturer specs.- Distance from the antenna to the SDR is 80ft using low loss LMR-400 direct buried coax.- The Coax and antenna were previously verified using an AA55 Rig Expert Antenna analyzer. SWR was measured at 1:1.2 @ 137Mhz Freq vs Attenuation was .7db @ 137Mhz (the SAWBIRD was NOT inline during the testing, the test signal is enough to damage it)- Antenna - I tested using two antennas: 1ST Test: Used a WIMO X-QUAD 2M Beam Antenna, the antenna for the test was configured with RIght Circular Polarization, hand-rotated with elevation set to 30 Deg 2nd Test: Used an M2 2M "Eggbeater" Omnidirectional Antenna, the antenna is hard-set for Right Circular Polarization- Satellites worked: NOAA 15, NOAA 18, and NOAA 19 during clear skies.Results:- PRO: The unit seems well made - Solder connections are good, appear to be machine installed. All components are flush to the board. SMA Female jacks have a 5-point attachment and are very secure which is important when transitioning to heavy coax.- PRO: I tested for RFI using an MFJ-805 Detector. Some minimal RFI from the USB cable powering the unit, but the Metal shroud over the amp seals any internal generated RFI.- PRO Power LED is bright - Can clearly see the light from 30M away with the preamp mounted on a 35ft mast. The barebones unit now comes with markings for "INPUT and OUTPUT" on the PC Board. On the deluxe version, the markings are covered up which has been the source of complaints in some reviews.-CON: Poor Reliability The first two units burned out on installation. The second two operated for a short time, perhaps a week or two. My testing results are based on those unitsCON: The gain is approximately 15 -20 DB. My reference was at a -100DBm noise floor, with peak signal rise (with pre-amp activated) at -80DBm measured at the SDR. HOWEVER, while the signal is boosted, the entire passband noise floor is also elevated by an equal amount. Peak measured Signal/Noise Ratio (SNR) without the Pre-amp activated was averaged over five minutes at peak satellite elevation, the result was 10db -11db. On a second pass (same satellite, same elevation) with the Pre-Amp activated the SNR remained at 10db - 11db. I also measured with the Pre-Amp removed from the signal path, the SNR was still -10db - 11db.In my opinion: The poor failure rate ( 4/4 unit failures) lowered my rating two stars. The lack of improvement in SNR lowered it another Star. The purpose of a quality signal preamp is to improve SNR in the passband, pure gain in the signal alone does not produce a better quality signal, it just makes a noisy signal louder. For those with poor coax, the gain may provide enough boost to deliver a signal, but the signal will not be any better quality. I suspect many that left positive reviewers simply thought that a "louder" signal is "better", and this amp WILL make the signal louder.Another problem with inexpensive SAW filters is that they are highly affected by temperature; the Piezoelectric material in the filters vibrates as the RF waves are converted to sound waves (and back). As the ambient temperature changes, the Piezoelectric material shifts its center frequency, so the advertised center freq could drift up and down. Higher priced pre-amps have TC-SAW filters that compensate for temperature variations. I didn't test for temperature variations, so I can't say either way if that impacted my results.It's a shame that I had to rate this product so low, as the build quality seems good, but the component failure rate (MTBF) is so high it doesn't deserve a higher rating at present. Perhaps the vendor can improve the components and tweak the SNR response to develop a tighter amplified passband. I'll take another look at this product next year, if improvements have been made I'll purchase another and re-rate the product.

Bandpass noisefloor is uneven by +-10dB.Caused a decrease in quality over nothing at all.

With a mast-mounted preamp and RTL-SDR receiver we got mostly mediocre images from the NOAA satellites. Adding this immediately before the RTL-SDR significantly improved the quality.

Ho comperato questo prodotto assieme ad una chiavetta NooElec SMArtee per migliorare la ricezione dei satelliti NOAA e METEOR M2 ma purtroppo ho avuto una grossa delusione.Collegato il filtro ad una antenna QFA non sono riuscito ad ottenere alcun segnale utile, dopo una prima verifica ho constatato che la chiavette era mal funzionante ( elevatissimo rumore di fondo ) ho provveduto quindi ad avviare il reso.Rifatti i collegamenti con un nuovo ricevitore SDR con BIAS tee esteno il filtro si è rivelato difettoso , segnali deboli pieni di disturbi che impediscono la corretta decodifica .Non volendo arrendermi ho provato il filtro con altri due modelli di antenne . ma purtroppo con il medesimo risultato segnali completamente inutilizzabili.Non ho avviato la procedura di reso del filtro NooElec SAWbird NOAA 137MHz perche appassionato di elettronica ed autocostuzione vorrei vedere dove è il difetto.EDIT: dopo averlo aperto ho notato la mancanza di due componenti e la rottura di un terzo , per la precisione due condensatori ed una induttanza.

After good success with the SAWbird+ GOES LNA, I decided to try the SAWbird+ NOAA on my APT setup to see if I could eek out a little more usable signal at the horizons for satellite elevation below 3 degrees. The antenna system consists of Tall Narrow QHA antenna followed by a PHQFH trifilar balun into a FM notch filter with -85dB attenuation in the broadcast band. About 20' of RG-8x from the filter feeds an RTLSDR v3 dongle. The SAWbird was installed immediately after the notch filter. The results with the LNA were worse than without no matter how much I lowered the SDR dongle's gain setting. Image quality was severely degraded. After using it for 3 consecutive passes I removed it and started receiving quality images again. I haven't tried it with a V-dipole as many users have and it might work okay in that configuration but if you have a system that works well to begin with you may not want to try this unit. I suspect I would have been wiser to purchase some LMR-400 to replace my RG-8x instead of buying this.