Search found 96 matches

by AB2EZ
Sun Apr 30, 2017 12:27 pm
Forum: Hermes 14-bit Firmware (10E, 100B)
Topic: Protocol 2 code for ANAN-10E and 100B available
Replies: 1
Views: 4463

Re: Protocol 2 code for ANAN-10E and 100B available

Phil

Thank you! As always, your highly valuable contributions are very much appreciated.

Stu
AB2EZ
by AB2EZ
Tue Apr 25, 2017 9:44 pm
Forum: PureSignal Operations (PowerSDR & Thetis)
Topic: External feedback level calculations
Replies: 15
Views: 30554

Re: External feedback level calculations

Brent You aren't missing anything. The XDC-1 is designed to operate as specified if both of its sample output ports are terminated with (i.e. looking into) 50 ohm loads. As you described, the XDC-1 forward sample output port is looking into a 50 ohm coaxial cable that is connected to the input of th...
by AB2EZ
Tue Apr 25, 2017 4:14 pm
Forum: PureSignal Operations (PowerSDR & Thetis)
Topic: External feedback level calculations
Replies: 15
Views: 30554

Re: External feedback level calculations

Brent Make sure that the line attenuator that you are using is terminated in 50 ohms (i.e. the impedance looking into the feedback port of the 8000 or the 200D), and not 25 ohms (the impedance looking into the feedback port of the 8000 or the 200D ... in combination with an extraneous, parallel 50 o...
by AB2EZ
Fri Apr 21, 2017 4:26 pm
Forum: Amplifiers & Tuners
Topic: Elecraft KPA1500
Replies: 5
Views: 7019

Re: Elecraft KPA1500

Hi

Please provide a reference to this announcement

Stu
AB2EZ
by AB2EZ
Mon Apr 17, 2017 2:07 pm
Forum: Amplifiers & Tuners
Topic: Operating amplfiers in digital modes
Replies: 2
Views: 3749

Re: Operating amplfiers in digital modes

Scott The method you described for adjusting the output power... while beneficial in utilizing the full range of the D/A converter... will not have any effect on the issue of reduced RF amplifier efficiency at reduced RF output power levels. With a fixed RF load impedance, the amplifier's drain volt...
by AB2EZ
Sun Apr 16, 2017 8:07 pm
Forum: Amplifiers & Tuners
Topic: Operating amplfiers in digital modes
Replies: 2
Views: 3749

Operating amplfiers in digital modes

Solid state linear amplifiers (such as the amplifiers in the RF chain of an ANAN-X transceiver or a solid state external linear amplifier) have RF output circuits that provide a fixed (designed in) RF load impedance to the output transistors*. *In contrast to traditional tube amplifiers that incorpo...

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