Full description on the QRP Labs VFO kit page.

The Si5351A VFO/Signal Generator kit provides two independent output freqeuncies, 3.3V peak-peak squarewave and in the range 3.5kHz to 200MHz (Si5351A datasheet spec). An extended range up to 292MHz has been experimentally measured. One output is variable and rotary encoder tuned, the other is fixed (configurable frequency).

The kit comprises:

  • Main controller PCB with LCD module and all components
  • Si5351A or OCXO/Si5351A (see note below) synthesiser module kit (Si5351A chip is pre-soldered at the factory)
  • Rotary encoder and short length of 4-way ribbon cable to connect it (note: pictured plastic knob is NOT included)

The kits are easy to build, with through-hole components only (no surface mount soldering - the Si5351A chip is pre-soldered at the factory).

Printed instructions are not supplied with the kit! Please see the VFO/Signal Generator web page to download the kit instructions, and for further information. Click here!

NOTE regarding the OCXO option: The VFO/Signal Generator kit INCLUDES the standard Si5351A module kit. Optionally you can also purchase the OCXO/Si5351A module kit, which is plug-in compatible with the VFO/Signal Generator. The OCXO/Si5351A kit has high frequency stability. However, the OCXO/Si5351A kit is more difficult to build and adjust than the other kits. If you want to build the OCXO kit, we recommend that you build the standard Si5351A kit first, and get everything working, THEN build the OCXO/Si5351A kit. In general the standard Si5351A module kit is good enough, particularly if you are using a GPS for frequency calibration and drift correction. You would only need the OCXO/Si5351A module kit if you want to operate in an environment with wildly changing temperatures, or you do not want to use GPS for drift correction, or if you have some particular requirement for extreme freuqency stability, or if you are a perfectionist or just want the challenge and interesting OCXO kit!

NOTE regarding TCXO option: The 25MHz TCXO option is another way to provide excellent frequency stability compared to the stock 27MHz crystal supplied. The Rev 3 PCB for the Si5351A Synth that will be supplied, is designed to accept the 25MHz TCXO module exactly and instructions are provided in its assembly manual. 

NOTE regarding the GPS option: Connecting a GPS like the QRP Labs QLG2-SE kit is a very nice and inexpensive addition to the VFO/Signal Generator kit. The GPS provides the initial frequency calibration as well as regular drift correction.

A drilled, cut, silk-screen printed enclosure is available (click checkbox above when ordering), with an accessories kit containing connectors, buttons/switches, and mounting hardware. See the VFO/SigGen case page for details. Note that this enclosure is separately shipped via tracked airmail from China where it is custom-made for QRP Labs. Requires additional hole in rear panel, for QLG2/QLG2-SE antenna coax, if the QLG2/QLG2-SE module is installed inside the enclosure. 

A 20mm knob is available to suit the rotary encoder in this kit, please see the checkbox above or check http://shop.qrp-labs.com/knob 

MORE INFORMATION - CLICK HERE

Write a review

Note: HTML is not translated!
    Bad           Good
Captcha

VFO/Signal Generator kit

  • Product Code: VFO
  • Availability: 88
  • $33.20


Available Options


Related Products

Si5351A synthesizer module kit

Si5351A synthesizer module kit

The Si5351A is a relatively recent clock-generator chip manufactured by SiLabs. It can produce three simultaneous independent 50-ohm impedance, squarewave outputs between 8kHz and 160MHz. Configuratio..

$7.75

OCXO/Si5351A synthesizer module kit

OCXO/Si5351A synthesizer module kit

This kit is an Oven Controlled Crystal Oscillator (OCXO) version of the standard Si5351A Synthesiser module kit. The 27MHz OCXO is kit-built, it does not use an expensive commercial OCXO component. Ye..

$16.00

Receiver module kit (including BPF)

Receiver module kit (including BPF)

This high performance receiver module uses a Quadrature Sampling Detector (QSD), also known as a Tayloe Detector. The mixer is arranged as a double-balanced mixer for maximum performance. The receiver..

$25.00

QRP Labs Control Unit

QRP Labs Control Unit

This is the basic kit that is at the heart of the Ultimate3S QRSS/WSPR transmitter kit, the VFO/Signal Generator kit, and the Clock kit. This "QRP Labs Control Unit" kit can be used in case it is nece..

$15.20

5W HF PA kit

5W HF PA kit

This 5W HF PA kit features an IRF510 MOSFET as the amplifier. But it also includes a discrete component power modulator (like a voltage regulator), which is controlled by an 8-bit Digital to Analogue ..

$20.00

VFO/SigGen case kit

VFO/SigGen case kit

Please click here for full description. This enclosure kit is similar to the Ultimate3S enclosure (PICTURED), but has a different front panel. The front panel text is "VFO/SigGen". The rotary encoder ..

$22.00

Knob

Knob

20mm diameter knob for rotary encoder in the VFO/SigGen kit...

$0.70

HF Sinewave VFO/SigGen set

HF Sinewave VFO/SigGen set

This is a set of all the ktis you need to build the sinewave output signal generator described in App Note AN006. Using VFO kit firmware s1.03 or above, the firmware can operate the VFO/SigGen kit wit..

$76.80

Rotary encoder

Rotary encoder

Rotary encoder used in QCX+, QCX-mini, and VFO kits. Includes washer and nut. ..

$2.00

QLG2 GPS Receiver module kit

QLG2 GPS Receiver module kit

OUT OF PRODUCTION: NOTE: Due to the global semiconductor crisis, this kit is temporarily out of production. It has been temporarily replaced by the QLG2-SE available here: http://shop.qrp-la..

$23.00

QLG2-SE GPS Receiver module kit

QLG2-SE GPS Receiver module kit

GNSS/GPS Receiver module kit, including patch antenna. This is a kit for a GNSS receiver that covers not just the United States GPS satellite network, but also Galileo (Europe), GLONASS (Russi..

$20.00