- Eagle (INACTIVE) - mailman.amsat.org

2M High Efficiency PA
by Tom Clark, K3IO 14 Jul '07

14 Jul '07

In case you missed it, the following EAGLE item appears in today's AMSAT NEWS SERVICE (ANS) bulletins: > SB SAT @ AMSAT $ANS-196.04 > High Efficiency RF Linear Amplifier Design Proposed for Eagle > > AMSAT News Service Bulletin 196.04 > >From AMSAT HQ SILVER SPRING, MD. > July 15, 2007 > To All RADIO AMATEURS > BID: $ANS-196.04 > > AMSAT members Allen Katz, K2UYH and Marc Franco, N2UO have > designed a VHF, high-efficiency, class-E, RF power amplifier > with a DC to RF efficiency of 86.8%. Their innovative > design is based on silicon carbide (SiC) metal-semiconductor > field effect transistors, or MESFETs. > > The design was presented in a paper at the IEEE International > Microwave Symposium in Hawaii. It is now available on-line: > http://www.cree.com/products/wireless_docs.htm titled > "Class-E Silicon Carbide VHF Power Amplifier" (June 5, 2007) > > The final amplifier efficiency was measured at around 86 to 88% > with this number holding quite well at almost any drain voltage > or output power. This type of amplifier is under consideration > for the envelope elimination and restoration linear amplifier > planned for the AMSAT Eagle satellite. > > [ANS thanks Marc, N2UO for the above information] > > /EX > Marc has promised to have a presentation with more details on this work for the October AGM in Pittsburgh. (BTW -- Marc & Patty are expecting their first 2nd harmonic)

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EMI Control & PCB Analysis - Aug. 22, Boston
by Tom Clark, K3IO 14 Jul '07

14 Jul '07

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Phase Noise Calibration
by Juan Rivera 13 Jul '07

13 Jul '07

All, I've written up my efforts to understand the SDR-IQ and to use it to measure phase noise on the 70 cm Receiver. You can read it HERE <http://www.juanr.com/pages/hobbies/ham_radio/Eagle/Phase_Noise_Calibration. htm> . 73, Juan - WA6HTP

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P3E SDX Design Levels take 2
by Howard Long 11 Jul '07

11 Jul '07

Folks Sorry I will try again with some formatting. Following the Teamspeak meeting, the pertinent levels for P3E: V Tx Phase +10dBm @ 145.895MHz into 50 ohm; V Tx Envelope 2Vp-p into 1kOhm baseband; U/V AGC I/O: 2V full gain, 5V full compression (output capable of ~2.5mA drive); U band IF in -15dBm @ 10.7MHz into 50 ohm; L band IF in -15dBm @ 10.7MHz into 50 ohm; S band IF out -15dBm @ 10.7MHz into 50 ohm. 73, Howard G6LVB

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Re: 10 MHz Phase Noise
by Juan Rivera 11 Jul '07

11 Jul '07

Bill, I'm sending you my preliminary phase noise results. As you recall, I constructed a battery-powered 10 MHz oscillator by grabbing a junked reference oscillator from an old HP signal generator and mounting it in a box with two 9-volt batteries, a switch, and a BNC. That allowed me to bring it into work and use the Agilent ES5500 Phase Noise Measurement System on it. Then I brought it home as my poor-man's phase noise source. Here's the test results on the oscillator and the first look at the SDR-IQ: Phase noise of the battery-powered oscillator Here's the same oscillator captured with the $400 SDR-IQ. The SDR-IQ drifts in relation to the device under test so the signal average is artificially low. It's really at 0db on the scale. With the IF and RF gain set to their lowest settings I think this lines up pretty well until the level drops down to the SDR-IQ baseline noise level at about the 100 kHz point. The 120 Hz bump has to be coupling from the PC via the USB port where it gets its power. I was able to rid the SDR-14 of that by tossing the wall wart and using a lab bench supply. For now I'll just ignore this one. What do you think? Juan -----Original Message----- From: Bill Ress [mailto:bill@hsmicrowave.com] Sent: Tuesday, July 10, 2007 7:27 PM To: Juan Rivera Subject: 10 MHz Phase Noise Hi Juan, Really sorry you couldn't transmit this evening. I always enjoy your keen comments. Thanks for the 10 MHz phase noise data. What is the model number for the HP oscillator? It's probably a version of the one I use. Now - - - - I'm really interested in what you read on your SDR. On the 8566B you'll just be looking at its internal LO's phase noise floor but it will be very interesting to see what your SDR phase noise floor is. Your test results will be the key data point in my decision to buy one. Again - much thanks for you fine work. Regards...Bill - N6GHz

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P3E SDX Design Levels
by Howard Long 11 Jul '07

11 Jul '07

Folks Following the Teamspeak meeting, the pertinent levels for P3E: V Tx Phase +10dBm @ 145.895MHz into 50 ohm V Tx Envelope 2Vp-p into 1kOhm baseband U/V AGC I/O: 2V full gain, 5V full compression (output capable of ~2.5mA drive) U band IF in -15dBm @ 10.7MHz into 50 ohm L band IF in -15dBm @ 10.7MHz into 50 ohm S band IF out -15dBm @ 10.7MHz into 50 ohm 73, Howard G6LVB

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Re: P3E SDX Design Levels
by Howard Long 10 Jul '07

10 Jul '07

Sorry I will attempt a re-format... Following the Teamspeak meeting, the pertinent levels for P3E: V Tx Phase +10dBm @ 145.895MHz into 50 ohm V Tx Envelope 2Vp-p into 1kOhm baseband U/V AGC I/O: 2V full gain, 5V full compression (output capable of ~2.5mA drive) U band IF in -15dBm @ 10.7MHz into 50 ohm L band IF in -15dBm @ 10.7MHz into 50 ohm S band IF out -15dBm @ 10.7MHz into 50 ohm Howard -----Original Message----- From: Howard Long [mailto:eagle@howardlong.com] Sent: 11 July 2007 02:59 To: 'AMSAT Eagle' Subject: P3E SDX Design Levels Folks Following the Teamspeak meeting, the pertinent levels for P3E: V Tx Phase +10dBm @ 145.895MHz into 50 ohm V Tx Envelope 2Vp-p into 1kOhm baseband U/V AGC I/O: 2V full gain, 5V full compression (output capable of ~2.5mA drive) U band IF in -15dBm @ 10.7MHz into 50 ohm L band IF in -15dBm @ 10.7MHz into 50 ohm S band IF out -15dBm @ 10.7MHz into 50 ohm 73, Howard G6LVB

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Password change part 2
by Robert McGwier 10 Jul '07

10 Jul '07

I have changed the password back to Eagle. It is now consistent with the Eaglepedia web page. Sorry for the confusion. Bob N4HY -- AMSAT Director and VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats, NJQRP, QRP ARCI, QCWA, FRC. ARRL SDR WG Chair "If you're going to be crazy, you have to get paid for it or else you're going to be locked up." Hunter S. Thompson

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Can't Log Into Conference
by Bill Ress 10 Jul '07

10 Jul '07

Hi Guys, For some reason "Eagle" doesn't log me in. Did the channel password change?? Regards...Bill - N6GHz

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TeamSpeak Password Changed
by Tom Clark, K3IO 10 Jul '07

10 Jul '07

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