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pamam

Joined: Thu, Mar 7th 2019, 17:54 Roles: N/A Moderates: N/A

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RF Filter Design May 15th, 18:34 1 97 on 15/5/20

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10 meter ssb question NC4AT on 16/5/20
Sorry I misread the chart. Skipped over the 5 bands specifically set up for USB according to the ARRL: check it out hear. Some interesting restrictions:
The FCC has granted hams secondary access on USB only to five discrete 2.8-kHz-wide channels. Amateurs can not cause inference to and must accept interference from the Primary Government users. The NTIA says that hams planning to operate on 60 meters "must assure that their signal is transmitted on the channel center frequency." This means that amateurs should set their carrier frequency 1.5 kHz lower than the channel center frequency.
Check this site for more info http://www.arrl.org/frequency-allocations
10 meter ssb question NC4AT on 15/5/20
I'm really confused: I'm sitting next to my wall chart of the ARRL Amateur Radio Bands. The 160, 80, 40 meters is not SSB at all unless SSB is part of the "Phone and Image" or the "RTTY and Data" category. The only band that has a Yellow section (SSB phone) is the 10 meter band. How is it that it is OK to use the 160,80,40 bands for SSB.
RF Filter Design pamam on 15/5/20
I'm looking f a reference to a filter design: a 2 Stage Filter that is an old style starting with a shunt impedance (LC parallel resonant), followed b a series Capacitor followed by another Shunt impedance as the first one, for bandpass mode. It is preceded and followed by an equal size capacitor. This circuit needs to work bidirectionally since input is both from the left and right depending on TX or RX mode
Any reason to have a Serial Port on a new Computer? WA2FTV on 15/5/20
It is very unlikely to be able to get a laptop with a standard serial or parallel (printer) port these days. With USB, WIFI, internet and Bluetooth connectivity there's no reason for them. Only hams and DIY people that want to talk to serial or printer ports, such as myself, need them. The easiest way is to go with Arduino boards and usb connections to them. I'm in the process of trying to get a DDS board to work from my laptop: Arduino allows you to write code in their IDE or from a Web-Based IDE which programs the Arduino to run an IOT device such as a "DDSBoard" frequency synthesizer i.e.
Arduino's web editor is here https://www.arduino.cc/

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