Hi Tony,
The modular approach for the new kit sounds really nice.
Did you have a chance to test the PCM2900 with the SoftRock? Perhaps
another little board with a PCM2900 could be added to the kit. This
way, people could just connect the SoftRock v5 to the computer and use
the internal computer/laptop soundcard only for listening and mic
input. This would be helpful specially in a transceiver configuration.
Another advantage would be the elimination of soundcard adjustments,
extra cables, etc. Adjustments could be done only once since the
soundcard would be part of the receiver.
There is another chip that could be used instead of the PCM29xx, the
UAC355x from Micronas. This chip is a little more complex to use, but
does not have the sample delay problem like the PCM2900. The chip is
currently used in the iMic USB audio interface.
73,
-- Edson, pu1jte, n1vtn, 7n4ncl
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--- In softrock40@..., "kb9yig" <raparks@c...> wrote:
Hello Everyone,
I am working on a version 5.0 of the SoftRock receiver and want to
see if there is interest enough to do a kit. The version 5.0
SoftRock oscillator will be at the fundamental frequency and depend
on 90 degree phase shift network to generate the quadrature clocks
for the QSD. This should give more flexibility in finding suitable
crystals for various bands.
The version 5.0 will consist of a two board stack with each board
having dimensions about 1 inch by 1.5 inches. The bottom board of
the stack with have a 5 VDC regulator, two voltage comparitors, the
QSD circuit and the low noise audio amplifiers. The upper board
will contain the oscillator circuit, the 90 degree phase shift
network, and the BPF for the desired band. The two boards will be
joined electrically by a row of header pins on the top board and the
corresponding sockets on the lower board. A threaded standoff
between the two boards will provide for mechanically holding the
upper board to the lower board. Corner mounting holes will be
provided on the lower board.
External electrical connections to the lower board will include,
supply voltage (9-12 VDC), an antenna input and a stereo audio cable
for line-in connection to the PC.
Target kit price is in the mid-twenty dollar range for one set of
boards and components for a single band. Additional band kits might
be on the order of $12 each with 80 meters through 30 meters and
possibly 20 meters also covered.
Please let me know if there would be any interest in such a kit.
Thanks and 73,
Tony KB9YIG
