The Heil Parametric Receive Audio System Equalizer (PRAS EQ) is a state-of-the-art audio processor that enhances the internal audio systems of amateur radio, shortwave, commercial, and CB receivers. The PRAS EQ allows radio operators to modify, shape, and improve the audio output of their receivers using three separate equalization controls.
Midrange frequencies are the most critical for achieving clear voice articulation in receive audio. The PRAS allows operators to have unique control over these important frequencies. First, operators can adjust the parametric midrange filter (MID FREQUENCY) from 400 Hz through 4 kHz, with the recommended sweet spot being at 2.5 kHz. In addition, operators can control the presence of these midrange frequencies plus or minus 15 dB using the MID GAIN control. Combined with a low-frequency filter (LOW) set at 160 Hz, and a high-frequency filter (HIGH) set at 6 kHz, the PRAS provides operators unparalleled control and quality of their receive audio.
VHF
Over 50 km on 481 THz! Great news from SP
On May 8, 2021, the group of Polish radio amateurs: Marek SP4ELF, Jurek SP2GUB, Adam SQ2DOL, Piotr SQ4MIK, and Jarek SQ4IOB realized optical communica... Read more
Anytone AT-D878UVII Plus – Best DMR Handheld Ham Radio 2021?
The newest DMR Handheld Ham Radio from Anytone is the AT-D878UVII Plus HT, which incorporates 500,000 contacts and 10,000 talkgroups into the same, gr... Read more
Recent activity on the 23cm band RNSS Coexistence Studies
The Chair of IARU Region 1 Spectrum Affairs, Barry Lewis G4SJH, reports on the work being done in defending the interests of the Amateur Services... Read more
AnyTone AT-D878UVII Plus Unboxing and Demo
In today’s video, we’ll be sharing a live unboxing of the AnyTone AT-D878UVII Plus as well as a product demo. VHF/UHF DUAL BAND: Feat... Read more
Wouxun REVEALS the KG-UV8H Dual Band 8-watt HT Radio
Brand new from Wouxun is the KG-UV8H Handheld, which features a different screen than earlier models, an 8-watt output power, and a 3200mAH battery. L... Read more
Amateur Radio Gets a Partial Reprieve on 3.5 GHz
Pending future FCC action, amateur radio secondary use of the 3.3 – 3.45 GHz band segment may continue indefinitely. The FCC, as part of a lengthy... Read more
Dump the UV-5R and Get the GT-5R
“For years the Baofeng UV-5R has been maligned as non-compliant with FCC regulations and a real spreader of spurious emissions. Further, it woul... Read more
Review
Comparing the lab599 Discovery TX-500 with the Elecraft KX2. Which one should you choose?
Comparing the lab599 Discovery TX-500 with the Elecraft KX2. Which one should you choose? Read more
Radio Set up on a Pickup Truck
James Hollen, D25Y31, has a radio and antenna set up in the bed of his pickup truck and wants to know if his truck will cause interference. Read more
Baofeng UV-9R Model Comparison and Power Testing
Today I compare and test 3 different models of the Baofeng UV9R. Read more
Metal Ham Shack – Issues and Improvements
Art, W9SOL, wants to know if his steel building will cause issues with his radio’s performance or improve its performance? Read more
Grounding and Bonding, Band Pass Filter and Field Day
On todays episode of Tuesdays with Tim, K3LR and Jeff, KB8ZWT we will discuss bonding and grounding and Band Pass Filters for Field Day! Read more
Unboxing the lab599 Discovery TX-500 QRP transceiver!
Unboxing the lab599 Discovery TX-500 QRP transceiver! Read more
RF Explorer EMF Licence Demo
This week Gary gives us an overview of the new RF Explorer Field Strength EMF Licence Add-On. We also demonstrate the RF Explorer WSUB1G+ Spectrum Ana... Read more
Equipment
R&S®M3SR Series4100 Software Defined Radios
Key facts Frequency range: 1.5 MHz to 30 MHz (transmission), 10 kHz to 30 MHz (reception) Power classes of 150 W, 500 W,... Read more
RETEVIS Finger PTT Motorcycle Helmet Microphone
“Because this is the only thing that makes it possible to talk to other riders over an intercom and talking over the phone without stopping on t... Read more
Introducing the BP-307 High Capacity Li-Ion battery pack
Short overview of the BP-307, a new high capacity 7.2V / 3350mAh (typ.) Li-Ion battery pack designed for Icom’s latest range of IP, LTE radio and sele... Read more
Lab599 Discovery TX-500
Today i’m bringing you an update on a very exciting qrp ham radio from Lab599. It’s called the Discovery TX-500. The TX500 is a HF & 6... Read more
LDG Z-100PLUS/IC-705
Auto Ant Tuner with 2000 Memories Pkgd For IC-705 The Package is IC-705 Ready and Includes The Following: 8 Heavy Duty AA Batteries Icom IC-705 I... Read more
Introduction for Icom AH-705 Automatic Antenna Tuner
JH1CBX Masaco introduces AH-705 designed for IC-705. Descriptions ・Covers the 1.8 MHz to 50 MHz bands 30 m, 98.4 ft or longer antenna: 1.8 – 54 MHz, 7... Read more
How to use a manual antenna tuner – Ham Radio Q&A
“Antenna tuners are a vital, yet slightly misunderstood ham radio station accessory. In this video we talk about what an antenna tuner does and... Read more
Antenna
First Antenna Questions
Laurent Egli, soon to be HB9***, has some questions about what antenna would be a good first antenna for her. Read more
Tri-band 6 element HF Upper Bands and CB Radio Yagi Antenna 3B-222
HF 3-Band antenna 3B-222 for 20m, 15m and 10m that covers also 11m CB through the power of full 3-D optimization! Perfect optimized tri-bander with ex... Read more
TN07 SFP-102 32′ Flagpole HF Ham Radio Antenna for POTA
“One of the Ham Radio Antennas that I have used most often for POTA – Parks on the Air – is the TN07 SFP-102 32′ telescoping f... Read more
Chameleon CHA-RXL Stealth Receive Loop Antenna
Chameleon is releasing a new receive only loop, the CHA-RXL. Lets get it on the roof, test it out and talk about why receive loops can be pretty aweso... Read more
Antennas Vs Trees
Jeff, KD8KPT, asks about the logistics of putting antennas up in his trees. Read more
Review of Bilal Isotron 20m Single Band Antenna
More than one Oggie has suggested I review the Bilal Isotron 20m Single Band Antenna Solve Virtually Any Restricted Space Problem – 40 Meter Iso... Read more
MAGNETIC LOOP 40M – 10M Built by 2E0ERO
Here we take a look at the principles of a transmitting magnetic loop and then test a magnetic loop built by 2E0ERO. Read more
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