Afraid of causing TVI / BCI / RFI / EMI?
A little background story…
I needed to find a heavy-duty & high power QRO Low Pass Filter which included 6 Meters in the pass-band, in order to replace my old faithful Kenwood LF-30A LPF which is HF only (up-to 30MHz).
The Kenwood LF-30A has served me well over the years, eliminating many TVI & RFI issues I’ve encountered in the past. However, each year, when the 6 meter “magic band” season opens, I would have to take it out of line (its cutoff is at ~34MHz) and I was left without a Low Pass Filter for the season potentially causing TVI & RFI.
To my rescue comes the PB-LPF1500-54 from Low Band Systems.
I selected the model from Low Band Systems, because it seemed heavy-duty and was rated for very high power (QRO ++), so it should loaf along with my conservative 500 watts.
Low Band Systems is a well-known brand, based in Russia, and they ship globally. In the US, DX-Engineering distributes many of their products. They build quality high-end products specifically designed for high-performance contest stations and DXpeditions, so I was sure that my money was well spent.
So, I ordered the unit after a couple of technical questions that I had were promptly answered by Andrey, RA6LBS, owner of LBS (thank you Andrey!). Then, Anna, and the LBS team, swiftly handled my order and it’s peculiarities (apologies for the hassle Anna) and immediately shipped it over. It arrived in only 10 days after ordering.
Indeed after unboxing it and doing initial testing, it seems superior in quality, construction and workmanship, and its performance specifications are the best by far, while pricing is similar to the model from Comet. Additionally, it has excellent ventilation so it remains cool even in the most demanding conditions (high load VSWR, QRO etc).
So far so good! The product is beautiful with its unique aesthetics (model, labelling etc is reverse-cut into the chassis) and its performance has been spot on! I’m an official fan!
Low Band Systems PB-LPF1500-54 1.8-54MHz Low Pass Filter Specifications:
- Power ratings: 1500 W Continuous, 3000W ICAS, ~5KW PEP
- Insertion Loss below cutoff : ≤0,15 dB
- VSWR: ≤1: 1.1
- Rejection on 70 MHz: ≥ 75 dB
- Rejection on 145 MHz: ≥ 55 dB
- Rejection on 432 MHz: ≥ 95 dB
Low Band Systems Website:
LBS Products at DX Engineering:
I hope you enjoy the video, and apologies for all the shacking (filmed by hand since I haven’t bought a tripod yet).
Happy DXing & Contesting all! Hopefully without RFI & TVI!
73 de Andy – SV1DKD