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SoftRock and other SDR Radios SoftRockRadio.org - DSPRadio.org - - "Elegance through simplicity of design ".
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Submitted by cecil.bayona on Wed, 09/26/2012 - 10:16.
I will post here rather that in "Available" article information relating to new models that Tony is working on. SoftRock Lite II12/20/2008
Good Evening All,
The circuit board for the SoftRock Lite II kit is through the layout
phase and will be checked this weekend. Circuit boards will go on
order Monday, December 22. The board may be seen in the files area
in the new SoftRock Lite II docs folder. I will get the Lite II
schematic posted later this weekend.
The Lite II circuit board size is 2.5 inches by 0.9 inches. All SMT
components are mounted on the bottom of the board and I think overall
the board will be easier to build than the earlier SoftRock Lite kit.
Since the Lite II is intended as a low cost SDR receiver sampler the
circuit has been simplified from the earlier SoftRock Lite. Changes
include synchronous clocking of the QSD by a single 74AC74. This
results in only a division of four from all crystal oscillator
frequencies. One hundred ohm resistors are included on the board in
each audio output output to the soundcard line-in to help prevent
some op-amp failures experienced with the earlier SoftRock Lite kits.
Kits to be offered in early January will include a 160m kit, an 80m
kit, and a 40m kit where each kit price will be the usual $10 for
US/Canada and $11 for DX with mailing costs included in each kit
price. Other kits to be offered will include an upgraded 30m kit, an
upgraded 20m kit and an upgraded 15m kit. Each of the upgraded kits
will be $12 for US/Canada and $13 for DX with postage cost included
in each kit price. The upgraded kits will all make use of 1/3 sub-
harmonic sampling but will have an LT6231 op-amp in the audio stage.
Thanks for the many positive comments concerning the value of the
SoftRock Lite as a low cost mean of letting people sample SDR.
Thanks and 73,
Tony KB9YIG
SoftRock working at 50MHz (6M)
11/16/2008
Good Afternoon All,
Bodo, DJ9CS, posted interesting results with a 6m BPF used on the v9.0
Lite+USB Xtall receiver board where 1/3 sub-harmonic sampling was used
to receive 6m signals. Bodo is seeing a 6m MDS around -120 dB.
Bodo give the following BPF information:
BPF values for 6m operation:
C100 = 56 pF
C101 = 120 pF
L100 = 7 turns #30 AWG on T25-6 (yellow)
T100 = primary 5 turns #30 AWG
secondary 3 turns each bifilar on T25-6 (yellow)
If any would like to try 6m operation with the v9.0 receiver, I can
supply a kit of parts that include the above components as well as the
circuit board and header pins for the connectors on the board. I would
need to ask for $4 for the v9.0 6m BPF kit for US/Canada and $5 for DX
with postage costs included in the prices.
I have the components on hand and can respond to orders for this kit
within a few days.
Thanks and 73,
Tony KB9YIG
6M and 2M converters in Beta Phase
10/22/2008
All,
At the G-QRP Miniconvention held last weekend, the QRP2000 Design
team shared the design of a novel 144 MHz Dual conversion SDR
Receiver which only requires a single Si570 as Local Oscillator. This
principle is used in the forthcoming QRP2008 SDR transceiver later in
the year to extend coverage to VHF and UHF Amateur Radio bands in a
cost effective way using "C Grade" Si570 devices.
We are currently working with Tony KB9YIG, who is planning to offer
plug-in 50 MHz and 144 MHz convertors for the new Softrock V9 Receiver
subject to satisfactory testing by Beta builders.
Hardware Prototyping of the 144 MHz Converter shows better 120dBm
sensitivity for 10dB Sinad in 2.4 kHz SSB BW, however AVR firmware is
still under development.
Extracts from the presentation and a beta circuit of the 144 MHz
converter is published in folder: QRP2000 Design VHF-UHF SDR/
An article is offered to QRP-ARCI for publication in QRP Quarterly.
Next Tony will ask for a few experienced Beta builders to verify
reproducebility of the VHF Converter and provide feedback.
Although firmware is not yet ready it is possible to use the hardware
with the latest version of PowerSDR by disabling the USB interface
and controlling the frequency of the Si570 with Tom's DG8SAQ
USB_Synth application. (For 144 MHz the multiplier needs to be set
to 0.8 and offset to 10000)
We hope that the novel VHF converter will become a popular expansion
of the Softrock family of Kits, similarly when we worked with Tony in
2006 to develop the Softrock V6 RXTX, the first of the successful
Softrock Transceivers kits produced by him.
73s
Jan G0BBL - QRP2000 Design Team.
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