开云体育

Colin, are you shure that the oscillator is really oscillating? If you have a scope: Perhaps pin 8 of the 74HC00 is always low? I think, that would kill the any transistor. Perhaps you could check

Sorry, forgot to write that my UQRSS-chip runs with version 1.06. 73 Stefan, DL4GCS

Hello Hans, I noticed sometimes the following problem: Sometimes the UQRSS seemes to get a wrong coordinate from the GPS and therefore calculates a wrong locator. This sometimes happens when I

Steve, I've got a professional 50 ohm dummy load on the RF output. I'll test the BS170 transistors against the data sheet tomorrow night just to double check the pin-outs etc. The BS170 transistors

Colin, could you tell us you are using for a dummy load for the PA. Also it might be a good idea to test the BS 170s to see what the pins are in reality . I am lead to believe that some manufactures

Hi Tony, I get the problem if I run the PA at 5v (linking from the +5v to +PA connection on the kit and also if I try to run the kit from 5v by connecting to +5v and then have a separate 9v supply

The PA is loaded by the LPF and then I have a 50 ohm dummy load on the output. Regards Colin G1IVG

Hi Stephen, Sorry for the delay in my reply. I have now done some more testing and have done the following: (1) I disconnected the GPS wiring to eliminate any problem there. (2) I have

I think 500mw is plenty. 200mw will be fine too. The difference is only 3db. Results will all depends on two factors: your antenna and the propagation. I will say this though, you will get FAR BETTER

Perfect, thanks Tony ! I'll stick to your advice. 500mw seems like a good power to play with. I like the idea of having just a bit more power in order to give a bit more advantage in discovering

My recommendation if you want to operate with more power would be NOT TO USE THE 2N7000. Instead, fit two BS170 fets. They are very cheap and have a much higher dissipation. IMPORTANT - the

Hello Steve, hello Hans, many thanks for the replacement of the too slow chips. In the meantime I have got a GPS also, so there is only an antenna missing. The new chip seems running correct. But I

Greetings all ! I've just placed my order for the latest Ultimate QRSS kit, mainly to use on WSPR but I'm sure I'll play with the other modes eventually. My plan is to use two of the 2N7000's at a

hi guys, I have noticeded a couple of you are still having problems. I will ship replacements which i will test on my own beacon first to verify that they work when they leave me. This wont happen

Hi to all members, I have received the ATmega V1,6 (thanks Steve) and have inserted it the correct way round but there is nothing on the display (totally blank) when I insert the old chip the display

Hi, I have finished modifying my 30 meters QRSS kit into a WSPR autonomous beacon using a TI Launchpad with MSP430G2553 (4,6 USD micro-controler kit). Here some pictures and more details (in french

Hi Hans,Steve, Today the new processor arrived, I installed it and everything works well. Setting up is a breeze now. Still don't know how the eeprom got corrupted. Now on to the GPS module, I m

I hope you've had some success but a sideways look at this might suggest you could have replaced the first failed PAs with 2N7000 and installed them as BS170. You do say that this happens

Have you measured the output voltage of the 7809? The fact that the problem doesn't happen when the higher voltage is applied to the PA suggests to me that there may be an issue around the regulation

What load are you using for the PA output?