Good Morning All, I am continuing to evaluate SoftRock Lite receivers for various bands. As I do that I end up with extra built units that can be offered for...
Guido and others, Because there is software being written for these receivers I thought I would post this question here. I have done some programming in the...
Loren, I bet that the "soundcard" programming that you referenced has something to do with DSP. You might want to start with some basic and essential...
Ken, Thanks for the info. As far as analog to digital I once built an ISA card with a simple A to D converter and an address decoder and wrote both basic and...
All, I don't know if this has been noted already, but the Dec issue of the Japanese language CQ Ham Radio magazine has a lead article, and full cover page, on...
There are a new "breed" of very low voltage drop regulators available nowadays. It's time to retire the old faithful 7805's and the 78L05's, especially if...
All, I don't know if this has been noted already, but the Dec issue of the Japanese language CQ Ham Radio magazine has a lead article, and full cover page, on...
Hi Loren, My first attempt at getting into and out of a sound card used PortAudio (www.portaudio.com). This is a very simple API that allows you to capture...
Hallo Walter, pleasure send schematics, Japanese sorry. vy 73 Gerd DM2CDB All, I don't know if this has been noted already, but the Dec issue of the Japanese...
... There you go a two switch QSD, not as sensitive as a four switch unit but it works just fine for the lower bands. -- Cecil KD5NWA www.qrpradio.com...
Dan: Yes, there are multiple "low drop out" regulators available on the market. BUT... Make sure you read and understand the output ESR (Effective Series ...
Graham,
Yes, there are always designers that cannot read the component datasheets properly. It's always been like that and I'm totally convinced we will...
Hi The circuit in the Japanese CQ Magazine is the one which Kazunori Miura published to this group in June. Since then he has upgraded 2 of the ICs and added...
Can someone provide information on the best PIN diodes for HF operation if we want to use them for electrical bandswitching. What characteristics do you look...
Kees, Back in the late 1970's Motorola had some cheap plastic PIN diodes with a long storage time. The part number was MPN3401, but they worked great for...
... 1N4007 can be used a pin diodes at HF frequencies. They are built using the Pin Diode structure. -- Cecil KD5NWA www.qrpradio.com www.hpsdr.com "Sacred...
Drake used the MPN3404 throughout the TR-7. There are a total of 43 of them in the transceiver. They are still available from many suppliers. The only one...
Kees, I found one of my old manuals with the data sheet in it for the part. In the section on the PIN diode switches I wrote," The Motorola MPN 3401 pin diodes...
One warning about using PIN Diodes, however. The RF voltage can turn the PIN diode on harder, and lessen the loss through them. In other words they are not...
Kees: 1.) A breakdown voltage appropriate for the voltage/power levels you will be switching. 2.) A low series on resistance appropriate to minimize losses at...
Pin diode switches are as reliable ( more reliable! ) as manual switches if designed properly!
You can use power pin diodes for bandpass switching in the PA...
Tilman,
Jo - Handboken har varit till stor hjälp när jag först ville börja pula med pin dioder.
Kul att den finns allmänt tillgänglig på nätet....
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