DDS VFO has been released by KEM

KEM (Kida Engineering Manufacture) has released the DDS VFO kit called KEM-DDS-VFO. It will ship from September 4, but they can accept the order of the kit. It costs 5500 Yen/$47.83 ($1=115Yen). The kit main features are DDS-VFO(frequency set by the botton, offset display, multiply display, sweep osciallation, break-in function, RIT, 30 channel memories, port to rotary encoder) and keyer (auto-keyer, straight key operation, side-tone for keyer and port for break-in).
This kit can be connected to KEM-TX7 and KEM-RX7 for the complete 40m QRP transceiver.
It uses AD9834 IC for the main DDS fucntion, therefore you may check the IC data sheet.

Test is completed: KEM DDS VFO

KEM (Kida Engineering Manufacture) has completed the test of DDS VFO. The picture shows the test board with the 40M frequency. They plan to release it around Sep. 4 because they need to prepare the kit manual.

I'd like to get it for my KEM-TX/RX.

KEM-DDS-VFO

Kida Engineering Manufacture (KEM) plans to release the DDS VFO with the keyer for the next week. The picture is uploaded to BBS. The DDS VFO can be connected to KEM-TX7/RX7 to cover the 40m band, and is also used for a general purpose VFO. The detail information of DDS VFO is here.

I am waiting for the kit for KEM-TX7/RX7 VFO.

p.s. : This product becomes KEM-DDS-VFO-MC50 as of Aug 4, 2009

G3RJV's VXO circuit

The article by G3RJV describes the VXO circuit for various bands. It describes the values of capacitors and inductors on the circuit. It can be a good reference for VXO.

Base Biased tuned VFO

VE7BPO has an interesting article about VFO. It calls the base biased tuned VFO. You can see the 7MHz VFO with three transistors (2N3904s). It covers 6.932MHz to 7.067MHz with 10KOhm variable resister.

DDS VFO for the QRP kits (KEM-RX7 and KEM-TX7)

Kida Engineering Manufacture (KEM) has the BBS for their kits. You may read those message with automated translation from Japanese to English.
The release plan of the DDS VFO is shown with the PCB layout. The new board has DDS-VFO, side-tone, keyer, power supply to KEM-RX7 and KEM-TX7 (why doesn't it have the English page?). I expect that it will be released soon. He mentions the board will be received on Aug. 10 in 2007.

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The DDS VFO kit is available through dx-orders. Here is the detail information of the kit.