ARDUINO NANO DDS VFO built by Carl, WB0CFF. Thanks Carl, excellent work . As you can see this VFO Preliminary Setup, Calibration, & Operation of N9KR's HW-101 Homebrew Arduino DDS-VFO.
Untuk proyek HF SSB ini saya menggunakan Bixen Exciter dari OM Youke (YB3LVX) dan beberapa modifikasi di : a. Mixer , di gunakan ADE-1 b. Crystal Ladder , di gunakan Crystal Filter merk ICOM FL-70 , Fc : 9.011,5 kHz , BW : 2,8 kHz
Important Note: The DDS VFO output level should be set as close to the output of the Triton's PTO as possible as the Triton's circuitry was designed around this value. Setting the DDS VFO's output higher than this will generate 'birdies' and needlessly increase the receiver's background noise level.
TR7 PTO Replaced by DDS VFO-2: TR7 PTO Ersätzt durch DDS-2 . First Full System Test with DDS and New Display . Innnenleben mit die neue Modulen unten in TR7: Bottom ...
Well, has I was saying is a Bitx 20 PCB and schematic (without the TX part) but using ADE-1 mixer and with an AD9850 DDS as VFO. Input filter is a 500Khz low pass (or arround that, still needs validation) and the RF input is on the mixer IF port because is the only input/output on the ADE-1 that can go to 0 Khz and less than 1Mhz.
Short description of DDS(VFO) drive PLL: 133,3-135,3MHz VCO signal (local oscillator) is mixed with a stable 130MHz signal. The difference signal 3,3-5,3MHz is filtered and amplified. CMOS IC 4046 compare the phase-frequency of this signal with DDS (VFO) signal.
First time read an article from PA2OHH’s web site about DDS VFO , I was curious, what is this thing called DDS VFO. Further reading tells that this is basically a LC – VFO but is controlled by a microcontroller, indeed it is very stable because there is a locking frequency mechanism, also it has a minimalis frequency display.
Mar 29, 2009 · 160 Meters and 75/80 Meters. 1880-1995 KHz on the 160 Meter Band. 3870-3890 KHz, and some newer 'expanded band' watering holes at 3675, 3705, 3725, and 3735 KHz on the 75/80 Meter Band
Tagged DDS, ham radio, Homebrew, VFO. 14 Comments. Tejaswi 4 years ago Permalink. Great Achievement Amogh… Go Ahead..Waiting for Post Part II!! Reply. Satish Chandorkar