This blog will show some experiments around the two SoftRock RXTX ( Ref. [1], [2]) built so far. A SI570 oscillator (Ref. [3]) and an Elecraft T1 ATU (automatc antenna match box) (Ref. [4]) were also built and wait for their application to the SoftRock RXTXs. So this blog will show some modifications of SoftRock RXTXs and the addition of some accessories. If everything goes well I would like to end up with a multi-band transceiver  :)

Practical tests will be done at our local clubstation DK0SU and sure -- I would like to meet other "SoftRockers" on the air.

73

Thomas, DF7TV

References:

• [1] DF7TV's notes on RXTXv6.2 - 40m/30m
• [2] DF7TV's notes on RXTXv6.2 - 20m/30m
• [3] DF7TV's notes on SI570/PICAXE experiments
• [4] Elecraft T1 ATU (automatc antenna match box)

Hi Everybody;
I'm really curious, What is the Freescale processor used on?
73's Bob K7HBG

Dear Anyone,

I want to understand more about the $60 sdr transceiver platform. Sent these questions to Tony on the contact page of his site but no reply. Also neither email contact nor specs page anywhere.

Admin: please remove if not for blog space.

I would like to understand the following:

1.Does the hardware work with software like GNU radio?

2.Does the platform have an API? Open source?

3.What is the bit length of I/Q?

4.Can I / Q be parsed into bins for later processing with software like GNU radio?

5.What waveforms can be programmed on the platform?

6.For Rx (hardware), what are sensitivity, loss, and noise?

7.For Tx (hardware), what is loss, noise?

8.For Tx/Rx what is isolation between two?

9.At ADC/DAC entry/exit, what is the voltage? If Tx signal generated, what is strength?

10. As sound card being used, the bandwidth will be limited to 20KHz? At what stage is the down/up conversion done? Wouldn’t the decimation take place after the down conversion(after digital conversion)?
Where is the decimation of signal done? At what factor? Is this programmable?

I actually keep a blog here http://m1kta-qrp.blogspot.com/ that details all my qrp and construction activities.

I have SDR RX build for many/most of the amateur frequencies and I am also working on a few other SDR activities.

Take a look at the blog for details  I update it reasonably regularly. Note that I tend to update project blogs so the older posts can be updated whenever work on a project progresses.

Hi All,

Playing catch in the the shack, building all the kits I had for a while.

I need a 14.333Mhz xtal HC49, pref low profile/SMD for a softrock-lite for use on a ICOM  with a 10.75 MHz IF.

As it being used after a roofing filter it needs to be somewhere close to center frequency,

digi-key have 14.3359MHz as a stock item, good price less than $1 and $25 p+p.

That would give a center freq of 10.7519 MHz, maybe pull it 5 KHz lower, but not sure if its  too far out of the passband of the roofing filter. I can sample at 96KHz.

I have lost the instructions etc for my SR-v6.0, 80 metre rx. Having bought it some time ago and only just started to build it. Has any one got a copy they could email me please? At I only have a pile of very nice components with no pictures, circuit, or distructions. HELP would be much appreciated. thank you.

Stuart M0RXX

http://zunkworks.com/node/5/

I've posted lots of high resolution photos and some descriptions of the build.  I've finally gotten around to testing the TX. So  I'll probally be posting more info when I get some time.  I had my first partial QSO on PSK/40m @~2Watts into a gutter/antenna with a station about 500mi away.  I say partial as he was having trouble getting clear text, and I never sent his signal report...  I plan on posting some screen shots, I/Q and mp3 recordings, and misc info/details.

Today I finished the prototype microprocessor board. I added the smd components on the copper side and I hope to start programming next week.

The LCD display and the band/bandsegment switches are mount and I soldered the wires to the connectors.

Now I can mount the brainboard and start programming. As a result the band/segment information will appear on the LCD display.

I wrote a small program already for my EasyPic3 system and will convert the code to this project.

So coming soon the first resulys..........

To show you some results watch the photo's

I got my Si570 today so my XTALL board is now assembled.  My 30 m/40m XTRT is about half assembled.  All of the Caps are installed and the NS/EW resistors are installed.  I had about 4 that needed to be moved and I will need to verify all of them before I install the IC's and coils.  I hope to finish the checks and installs this week-end.  I have downloaded the source code from Flex Radio and hope to be able to compile a version of Power SDR to run under Linux (may be beyond my skill level).  I do have a laptop with XP I can do some of the check-out on however.

This is a blog to document some of the experiments of DF7TV using the programmable crystal oscillator SI570 from Silicon Laboratories controlled by a PICAXE processor 28X1 from Revolution Education Ltd. The main components of the circuit "SRC11" are the SI570 DCO on a board made by David, WB6DHW, a PICAXE microprocessor 28X1, a Microchip I2C-EEPROM 24LC256(32kByte) and a (serially controlled) LCD.