DERMATOLOGY EXPERT FORUM

Bias Circuits for RF Devices

A transistor amplifier must possess a DC biasing circuit for a couple of reasons. . A very low-cost biasing scheme for RF and microwave circuits, but with less .
http://www.qsl.net/va3iul/Bias/Bias_Circuits_for_RF_Devices.pdf

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rf amp circuit using 2sc2879

Ameritron ALS-600S with switching power supply - W0CP Home Page

In fact, the new power supply is perfectly compatible with all ALS-600 RF decks and . This amp utilizes 2SC2879 bipolar output transistors, another popular output . A thermal protection circuit will force the amplifier into standby mode when it .
http://www.w0cp.com/ALS-600SPS.htm

rci2970n2 bias help - Page 4

I am not a fan of Mosfet's in high power RF circuits they seem to fail freq. . the linear amp I am guessing it is still using a single 2SC2879?
http://www.worldwidedx.com/export-radios/107050-rci2970n2-bias-help-4.html



100w HF linear amplier for use with Picastar - G3vpx.net

This amplifier uses G6ALU's excellent board design (- see his website) . (I am building another for my G3VPX transceiver using a pair of Toshiba 2SC2879 transistors) . I will publish a schematic, PIC code and LPF L and C values soon.
http://www.g3vpx.net/pa100w/pa100w.htm

Data Sheet - RF Parts Company

2~30MHz sss LINEAR POWER AMPLIFIER APPLICATIONS. Unit in mm . intermingle with normal industrial or domestic waste. 961001 . Pi TEST CIRCUIT .
http://www.rfparts.com/pdf_docs/2SC/2SC2879.pdf



RF Amplification

Proven design with low risk. Proven ability to survive poor conditions (high SWR, e.g.) When we set out to design this amplifier, we assumed (naively, as it turned . of splitting and combining the RF going into and out of the amplifier modules. . you can still use the bias circuitry, board layout and input/output circuitry from .
http://k6if.com/ssamp/id5.html

Building my own mobile hf Amplifier....Filter questions

In addition, you will need to know what you are doing (HF amplifier . I did plan on using 8 2sc2879 transistors and the heat sink from a cb .
http://forums.qrz.com/showthread.php?247654-Building-my-own-mobile-hf-Amplifier-Filter-questions



Gatekeeper Built 0X4 2SC2879 Custom Base Linear Amplifier ...

Apr 16, 2012 . Gatekeeper Built 0X4 2SC2879 Custom Base Linear Amplifier - Modified AB(C) Biased . The huge tug of war with RF Amplification is Efficiency VS. Linearity . His job is take the trans. and design circuits they can be used in.
http://www.youtube.com/watch?v=ObZfpCobo2A



Research: Tube Type "CB" Linear Amplifiers

Using an external RF power amplifier with a citizens band radio is illegal in . The Twister has four 2SC2879 transistors which are rated for 100 watts PEP . Of the 70 watts, some power is lost due to the output circuit, the coils and capacitors.
http://www.bunkerofdoom.com/lit/cb/linears/index.html



i have built a rf amp for 10 meter using eight 2sc2879 transistors ...

Aug 1, 2011 . Question - i have built a rf amp for 10 meter using eight 2sc2879 . With the circuit on and functional, read the Voltage drop across the R-13 .
http://www.justanswer.com/electrical/5cmew-built-rf-amp-10-meter-using-eight-2sc2879-transistors.html

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instruction manual - ameritron als-500m

The ALS-500M uses two pairs of 2SC2879 transistors operating at 13.8 volts nominal . High quality RF components combine with load fault sensing, temperature . The ALS-500M features a load fault trip circuit that bypasses the amplifier if .
http://www.qsl.net/4/4x6on/RADIO%20MANUALS/AMERITRON/AMERITRON--ALS-500M-User-Manual.pdf



ALS-500M $ 899.00 - Ameritron

MOBILE AMP, 500W SOLID STATE, REMOTE READY, 12V US . -Mobile no tune Solid State Amplifier - uses four rugged 2SC2879 high power linear RF . Continuous Coverage - 1.5 to 22 MHz 10/12 Meters with easy to install optional kit. . output network, push-pull output circuit has excellent harmonic suppression .
http://www.ameritron.com/Product.php?productid=ALS-500M



Take care.

Dr. Rockoff
4 Comments
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AtlasEng

The audio signal from the first stage microphone amplifier Q202 (PC-200) is coupled to integrated . Testing the modified circuit using the soldering tags on top of the PCB. . HF communication. 60 W. 15 A. 13 dB. –. A50-12 CD2545. 2SC2879 .
http://pa0fri.home.xs4all.nl/Mods/Atlas215/AtlasEng.htm



Thank-you.
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Hi,

usedequipment

Via Credit Card To Hold The Item For You. We Get Many Calls .
http://www.rrcom.com/sales/preownedequipmentforsale.html

Andrews Communications - RF Devices

2 days ago . World's most advanced amateur automatic HF linear amplifier . Yes, covers 1.8~ 54MHz in amateur bands with 1,000W peak RF output in ALL modes! . Two vacuum tuning capacitors in traditional "T" matching circuit; Linux . SSB input Has a pair of 2SC-2879 linear characteristic transistors in push-pull.
http://www.andrewscom.com.au/site-section-06.htm

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Texas Star DX 800V Class AB/C HAM RADIO MOBILE LINEAR ...

BIG DADDY LINEAR AMPLIFIERS AND ACCESSORIES .
http://www.starelectronicsandcommunications.com/texasstardx800vclassabc.aspx

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Atlas 350XL Product Reviews

Im using 2SC2879's and they are a bit over kill - and heat the small heat-sink fairly . Most circuits had double functions for receive and transmit, keeping the . PTT switch or the CW key was released; RF leakage from the BFO into the IF amp , .
http://www.eham.net/reviews/detail/961

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2sc2879,Buy Quality 2sc2879 from Manufacturers and Suppliers on ...

2sc2879, Source 2sc2879 Products at Integrated Circuits, Transistors from Manufacturers and . TOSHIBA RF Power Transistors 2SC2879(China (Mainland )) . Buffer/Line Driver with 3-STATE Outputs - 2sc2879 -ic copier- Fairchild Semiconductor . Description:TRANSISTOR (2~30MHz SSB LINEAR POWER AMPLIFIER .
http://www.alibaba.com/showroom/2sc2879.html

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Ferrite, Pot Core & E-Core Transformers | The Electrical Resource

RF Parts offers broadband ferrite transformers that are used in linear and Class . in commercially built amplifiers using MRF454, MRF455, 2SC2290, 2SC2879, .
http://www.theelectricalresource.com/category/ferrite-pot-core-and-e-core-transformers.html

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Download - RF Parts Company

Wire for RF Transformers . . . . . . . . .62. Filament & Low . commercially built amplifiers using SD1446, MRF455, 2SC2290,. 2SC2879, and similar transistors.
http://www.rfparts.com/pdf_docs/061%20Transformers.pdf

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PDF datasheet

Connectors: Relay: engages ampli?er when grounded. +12 VDC open circuit and supplies 100 . 12 VDC open circuit. RF input: SO-239, 50 Ohm input. RF Out: 50 Ohms with full power into any SWR . Transistor, (4) 2SC2879. Metering: .
http://www.ges.cz/sheets/a/amepa.pdf

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