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RF Power Amplifier Efficiency: Big Challenges For Designers
Modern digital modulation techniques demand high amplifier linearity, without which intermodulation distortion occurs that degrades signal quality. Unfortunately, amplifiers perform best when they are driven near their saturation level, after which …
Read more on RF Globalnet (press release)

High-resolution audio: Is 2015 the year it takes off?
So on the one hand you believe that sonic differences between MP3's and CD's cannot usually be heard by most people, but in the argument above you do think that 4th (or 5th/6th) order distortion from ultrasonics could be heard within a 20-20K signal?
Read more on ExtremeTech

MFJ Enterprises MFJ-986 1.8 ~ 30 MHz Rugged Roller Inductor Differential-T Antenna Tuner 3KW PEP Amplifier Input Power (1500 Watts PEP SSB output power). Also Covers MARS & WARC Bands.

MFJ Enterprises MFJ-986 1.8 ~ 30 MHz Rugged Roller Inductor Differential-T Antenna Tuner 3KW PEP Amplifier Input Power (1500 Watts PEP SSB output power). Also Covers MARS & WARC Bands.

  • MFJs exclusive AirCore Roller Inductor gives absolute minimum SWR — something tapped inductors just cant do. 3-digit turns counter plus a spinner knob gives precise inductance control so you can quickly retune your frequency. A lighted peak and average reading Cross-Needle meter shows SWR, forward and reflected power at a single glance!
  • You get 6-position antenna switch that lets you select two coax lines and/or random wires (direct or through tuner), balanced line and external dummy load. The MFJ TrueCurrentBalun for balanced lines minimizes feedline radiation that causes field pattern distortion, TVI and RF in you shack. Ceramic feedthru insulators for balanced lines withstand high voltages and temperatures.
  • Wide-spaced tuning capacitor plates let you run high power without arcing. MFJs lighted Cross-Needle Meter shows you SWR, forward and reflected power simultaneously. It reads peak or average power on 2000 or 200 Watt ranges. The lamp has on/off switch nd uses 12 VDC or 110 VAC with MFJ-1312D ** Not included **
  • Replacing two variable capacitors with a single differential capacitor gives a wide range T-Network tuner with only two controls — a tuning capacitor and a roller inductor. Simple 2-knob tuning makes tuning easier than ever. You get minimum SWR at only one setting a broadband response that ends constant re-tuning. Youll spend your time QSOing instead of fooling with your tuner. The compact cabinet has plenty of room to mount the roller inductor away from metal surfaces for highest Q — you get high efficiency and more power into your antenna.
  • More tuners use a voltage balun that forces equal voltages on the two antenna halves. It minimizes unbalanced currents only if the antenna is perfectly balanced — not the case with practical antennas. The MFJ-986 uses a true current balun to force equal currents in the two antenna halves — even if the antenna is not perfectly balanced! The MFJ TrueCurrentBalun gives superior balance over voltage baluns and minimizes unbalanced current. This reduces field pattern distortion, concentrates your power for a stronger signal plus it reduces TVI and RF in your shack caused by feedline radiation.

MFJs innovative Differential-T Tuner uses a differential capacitor that makes tuning easier than ever. It gives minimum SWR at only one setting. Broadband coverage ends constant re-tuning. The MFJ-986 is a rugged roller inductor antenna tuner that handles 3KW PEP SSB amplifier input power (1500 Watts PEP SSB output power). It tunes 1.8 – 30 MHz continuously, including MARS and WARC bands.

List Price: $ 335.00

Price: [wpramaprice asin=”B005OEBGJG”]

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Cosintel New Arrival Inline Satellite Amplifier 5-2300MHz Signal Booster

Cosintel New Arrival Inline Satellite Amplifier 5-2300MHz Signal Booster

  • Design for in-line boosting SAT
  • Powered by the receiver via coaxial cable
  • Model with slope gain can equilibrate cable loss
  • Low inter modulation distortion
  • Zinc die casting housing, nickel plated

Main Features

Design for in-line boosting SAT IF

Powered by the receiver via coaxial cable

Model with slope gain can equilibrate cable loss

Low inter modulation distortion

Zinc die casting housing, nickel plated

Specification

Model: INA30FS

Input: 1 SAT

Outputs: 1 SAT

Frequency: Sat.: 5-2300MHz

Sat. Gain: 20dB

Output level (IMD3-35dB) (dB): 106dBuV

Max Current to LNB: 500mA

I

List Price: $ 8.99

Price: [wpramaprice asin=”B00X0PQ470″]

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HAM RADIO AMPLIFIER TUNING PECKER WITH SIGNALINK

HAM RADIO AMPLIFIER TUNING PECKER WITH SIGNALINK

Just a quick video on how I passed the Ham Radio Technician Class license exam. Here are some links to help you out if you are looking to take the exam.

The No-Nonsense Technician Class License Study Guide by Dan Romanchik:
FREE (Or Donation) Here:
http://www.kb6nu.com/tech-manual/
Via Kindle here:
http://www.amazon.com/No-Nonsense-Technician-Class-License-ebook/dp/B004G8QVD2

Ham Radio for Dummies

NEW: Ham Radio License Manual – ARRL
http://www.amazon.com/Ham-Radio-License-Manual-Arrl/dp/0872590976/

OLD: Now You’re Talking! All You Need For Your First Amateur Radio License
http://www.amazon.com/Youre-Talking-First-Amateur-License/dp/0872598810

HamExam.org: Free Amateur Radio Practice Exams:
http://hamexam.org/

American Radio Relay League:
http://www.arrl.org/
Video Rating: 4 / 5

ARRL’s RF Amplifier Classics: Practical Designs and Construction Details from the Pages of QST and QEX

ARRL's RF Amplifier Classics: Practical Designs and Construction Details from the Pages of QST and QEX

List Price: $ 19.95

Price: [wpramaprice asin=”0872599310″]

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Yaesu FL 7000 Linear Amplifier

Yaesu FL 7000 Linear amplifier.
Video Rating: 5 / 5

Yaesu FT-252E VHF Transceiver

Ordered by a friend of mine and here to be programmed comes the 79.00 euro new hand held radio from Yaesu. It also has a sister radio the FT-257 which covers…
Video Rating: 0 / 5

10-100pF/5KV HOMEBREW AIR VARIABLE CAPACITOR KITS for yours KW RF amplifier ,antenna tuner or magnetic loop antenna The plates are manufactured using a CNC m…
Video Rating: 0 / 5

SHOZY(TM) PX-M1 Grade fever Class T Digital Mini Portable Stereo Headphone Amplifier Amp

SHOZY(TM) PX-M1 Grade fever Class T Digital Mini Portable Stereo Headphone Amplifier Amp

  • Power supply: built-in 4.2V lithium battery
  • Adapter headphone impedance :8-300 Ohms
  • Frequency range: 10HZ-100KHZ
  • Signal-to-noise ratio: 105dB

Power supply: built-in 4.2V lithium battery
Adapter headphone impedance :8-300 Ohms
Frequency range: 10HZ-100KHZ
Signal-to-noise ratio: 105dB
Total Harmonic Distortion:

List Price: $ 299.99

Price: [wpramaprice asin=”B00DIR6Q6O”]

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Find More Inter-Modulation Distortion Products

SHOZY(TM) PX-M1 Grade fever Class T Digital Mini Portable Stereo Headphone Amplifier Amp

SHOZY(TM) PX-M1 Grade fever Class T Digital Mini Portable Stereo Headphone Amplifier Amp

  • Power supply: built-in 4.2V lithium battery
  • Adapter headphone impedance :8-300 Ohms
  • Frequency range: 10HZ-100KHZ
  • Signal-to-noise ratio: 105dB
  • Battery life: 100 hours

PX-M1 on the basis of the previous generation product is lightweight, thin shape, the main volume of the fuselage is only 93mm * 58mm * 13mm. Not only visually more beautiful, while the overall volume slightly thin thickness can be more easily incorporated into amp pouch even pocket bag, very suitable for portable use.
PX-M1 built-in rechargeable lithium battery, micro USB interface, USB power line, charging into the computer USB port, at the same time using commercially available USB power supp

List Price: $ 295.99

Price: [wpramaprice asin=”B00DIR9K76″]

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Some recent Ham Radio auctions on eBay:

[wprebay kw=”ham+radio” num=”0″ ebcat=”-1″]

Tokyo Ham Fair 2010 Close up of The Yaesu VL-2000 high performance linear amplifier covers 160 to 15 and the 6 meter amateur bands. Also FT dx9000 , FT dx5000 and more.
Video Rating: 5 / 5