I was half asleep last night when I first replied - hence the confusion over upconversion. As you're on 9kHz, converting doesn't apply and the PC generates direct Tx drive. The quadrature bit is no
Hello Andy, Scott, Wolf, indeed WSPR is MFSK, I should be reading mails more carefull. Some time ago I was thinking about running WSPR with a "divide by 2" class D PA and wrote a small piece of softw
Its the shift that's the problem , going for a x2 audio may drop you out side the ssb filter pass band ..... From: Andy Talbot Sent: Wednesday, April 20, 2011 10:09 PM To: [email protected]
Hi Rik I would like to play with Spectrum Lab's digi-terminal modes to experiment with various baud rates over different distances. Any advice from your experiments? TU Scott On 4/21/2011 10:46 AM, R
Hi Rik, AFAIK WSPR is not MSK. It's 4-FSK. One of the very exotic modes in WSJT (not WSPR) was indeed MSK but I don't remember which one. About the FET push-pull drive: I wouldn't rely on a windoze P
I assume you are genrating the MSK from soundcard output, in which case two options come to mind: 1) Double the frequency. Full wave rectify the audio sinusoid, pass the AC part of the result int
Laurence ... and other interested parties Just updated the web page with the improved doubler circuit that I've been using this season. I should have updated this a while ago. While the original circ
Hello Scott, what kind of MSK do you want to transmit ? WSPR by any chance ? 73, Rik ON7YD - OR7T On 21 April 2011 01:28, Scott Tilley <[email protected]> wrote: Hi Andy Holy mind bogglingness batma
Bin too quick to type.. NOt thinking straight... You need to the upconvert either the resulting doubled audio tone by twice the RF carrier, or upconvert first and double the final RF. Same ideas f
Hi All I wonder if someone can explain to me how to feed an MSK signal into a typical Class D transmitter? I mean by typical that the TX has a 4013 type /2 system feeding two FET drivers to drive FET
Aargh... Andy beat me by a few seconds ;-) 73 and a happy Easter weekend, Wolf . Am 21.04.2011 19:51, schrieb Andy Talbot: WSPR isn't MSK.. (Minimum Shift Keying) Its MFSK (Multi Frequency Shift Keyi
WSPR isn't MSK.. (Minimum Shift Keying) Its MFSK (Multi Frequency Shift Keying) 'jnt On 21 April 2011 18:46, Rik Strobbe <[email protected]> wrote: Hello Scott, what kind of MSK do
Hi Andy Holy mind bogglingness batman... Here's the parameters to make this real simple: - I want to generate a MSK signal out of the transmitter at 8970Hz. - I'm using Spectrum Lab, which allows me
Dear Scott, LF Group, Square up the soundcard output with a limiting amplifier, then feed to class D stage via inverting/non-inverting gates to obtain the compementary gate drives. The sound card out
Scot Big problem is if you have a division in the drive train ... depends what mode you want to transmit , if you can select a shift x2 or x4 the required , then you can drive down the divider train
http://www.w1vd.com/X2LinearClassDinterface.html or..... Laurence G4DMA Its the shift that's the problem , going for a x2 audio may drop you out side the ssb filter pass band ..... From: Andy Talbot
IF the attached file gets though ( 137interface.gif ) it is the circuit diagram of the signal conditioner I use to drive my switchmode 137kHz Tx from an upconverter output. For other frequencies
If you can generate the message by replaying from a .WAV file, this ought to be straightforward. Change the sampling rate value in the .WAV file header and it will replay at that rate. But... of
Thanks Andy! Sanity check now complete. I did as you described before I asked the general question and strange things happened... I'm going to need to double check what I was doing to ensure I didn't
