I have changed D2, D3, and D8 with BAS32L's. Though at low output in CW mode it is somewhat stable on 80M, less stable on 40M and giving full ouput on 20M after initial keydown (I'm using the tx/rx on the front). Looks like SB-844 is the next thing to do. Though D8 is there allready, I have to look at the diagram to see how to do it.
I have now added the two extra diodes.
Next is testing to see if there is any changes.
Sunday, May 31, 2009
Saturday, May 23, 2009
Modifications on my TS-120S
Changed D2, D3 and D8. Due to the problem of full carrier after initial modualtion in SSB mode or first key down in CW.
I didn't have the suggested replacement diodes, so i changed all 3 to BAS32L smd (Don't ask how).
Poweron and RX works. Next is to test TX.
To do this i need a bigger PSU and a dummy load.
The PSU i can borrow from a fellow ham.
I didn't have the suggested replacement diodes, so i changed all 3 to BAS32L smd (Don't ask how).
Poweron and RX works. Next is to test TX.
To do this i need a bigger PSU and a dummy load.
The PSU i can borrow from a fellow ham.
Friday, May 1, 2009
Is tx'ing possible with a pic16f84?
After seeing my simple 30m mept tx get to I and G, I have been thinking about if it would be possible to tx wspr using the same xo and buffer as I have been using in mept.
For the time coordination, I have thought about using a now shelf project that I used years ago. A DCF77 digiclock, slightly modified. I added a level converter for rs-232 levels. I used it for a ntp project. It gives time signals with about ~25ms accuracy.
First thing is to find out how to generate the 4-FSK coded signal.
For the time coordination, I have thought about using a now shelf project that I used years ago. A DCF77 digiclock, slightly modified. I added a level converter for rs-232 levels. I used it for a ntp project. It gives time signals with about ~25ms accuracy.
First thing is to find out how to generate the 4-FSK coded signal.
Friday, April 17, 2009
Thursday, April 16, 2009
Wednesday, April 8, 2009
QRSs homebrewing
I'm tinkering with a "simple" so far it contains 4 BC547's
It is a mud of different designs.
The patterns generator has been made by Hans Summers.
The genneral idea was taken from a pixie2, thought the signal doesn't look to good.
A good lpf takes rather good care of that though.
The output RF level is about 40mW in 50 Ohm.
Bill Meara (n2cqr) hosts a great podcast, soldersmoke.
Vy 73 de OZ2DAK, Soeren
It is a mud of different designs.
The patterns generator has been made by Hans Summers.
The genneral idea was taken from a pixie2, thought the signal doesn't look to good.
A good lpf takes rather good care of that though.
The output RF level is about 40mW in 50 Ohm.
Bill Meara (n2cqr) hosts a great podcast, soldersmoke.
Vy 73 de OZ2DAK, Soeren
Sunday, February 22, 2009
10.140 MHz QRSs beacon
Got samples from analog.com.brNow to put them into use:
1) get geda installed
2) check/find the schematic symbols
3) check/find the pcb footprint
4) draw the schematc
5) layout a pcb
6) ask a friend to make the pcb
7) go into soldersmoke ( is a podcast actually)
8) make program for a pic or simply control it with an USB to lpt converter
#1 is done, to #2 though symbols needs to be created.
1) get geda installed
2) check/find the schematic symbols
3) check/find the pcb footprint
4) draw the schematc
5) layout a pcb
6) ask a friend to make the pcb
7) go into soldersmoke ( is a podcast actually)
8) make program for a pic or simply control it with an USB to lpt converter
#1 is done, to #2 though symbols needs to be created.
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