... Also, soundcards have significant noise at low frequencies. It's called 1/f noise since it increases decreasing the frequency. To give a figure, the...
Hi Bodo, I don't think it will be necessary to change the BPF on your PA board. As I look forward to kit production I thought it would be appropriate to use a...
Hi Julian, I still have a few of OSC/BPF kits for the v5.0 SoftRock. The QSD kits are all sold out and I am not planning on additional QSD kits. Let me know...
Hi Tony, 15m or 40m would be good and an SSB section of 10m if you have them. Cheers, Julian Tony Parks <raparks@...> wrote: Hi Julian, I still have a...
Good Morning, I have organized the docs needed to build the QSE and PA boards into two folders. One folder contains the docs needed for kits shipped prior to...
I switched off the spread pectrum BIOS option in my "home made" PC and the width of the noise spike is now vey narrow. Looks like almost a single frequency...
... just curious, how new is your motherboard? I guess if u told me what cpu it's running that might also help. I'm thinking everything I have it to old, I...
Bill, Tony, All, I made my first CW contact this morning with the SR6 Exciter Alpha prototype using the latest Version of PowerSDR Software which Bill released...
Hoo hah - a transceiver is born! Congratulations Jan -- very glad to hear the software seems to be working. As far as I know you're the 1st to get an on air...
I apologize for fowarding this digest to the group. I cannot understand how it happend. I suppose it was late night clumsy fingers. 73, Gene W3PM GM4YRE...
According to current FCC regs, any spurious (unwanted) emmisions must be greater than 43 dB down from the carrier level. (See below) The old standard for QRP...
Hi Duncan, et. al., Your interesting tests with the Soundblaster Live! 24 card made me wonder if I could make one of them work on Ubuntu Linux. I sent an ...
... received ... somebody ... from ... I ... Antenna ... reading. ... check ... the ... to ... below ... via ... Congrats Jan!! My exciter just came to life,...
... Alpha ... Bill ... 599 ... and ... as ... find ... 96K ... S- ... S- ... I ... PowerSDR ... QSO ... Watt. ... Sorry for the add-on reply, but has anyone...
Marco IK1ODO wrote: There would be also a peak at 0Hz due to DC imbalance of the ADC inputs, but the ADCs used in 24bit souncards have an internal high pass...
I am playing with mine also. Maybe those of us with "Cheap" sound cards fine this, I do. Two things: If just a single frec it is most likely the math finding a...
... The picture of the single stand alone spike is what one of PC's has, the other four have the typical spike with noise going out quite a ways slowly and...
... Hmmmm.........The Hump......Here comes the truth??? ... the ... under ... 16bit ... you ... This ... IMD3 ... output ... attenuation. ... noise ... floor. ...
... You have to have a filter because the detector will respond to odd harmonics of the LO, that is why for some frequencies we have been discussing dividing...
Jean, right now there is no kit. I've had some PCBs made to do the initial testing but I still need to do some more testing, particularly with sub-harmics and...
Well, I have added myself to those who actually made a QSO using Tony's new exciter. At 855PM this evening, I was able to talk with WU9F in Madison, WI (his...
Ian, I was looking at your design and it looks lik eyou are using the VCO in the 4046. I would think an external VCO would be a lot cleaner??? frank wa1gfz ...
Congrats Terry. Guess I forgot to post on how the Tx/Rx changeover can be seutp -- PowerSDR can use a serial port on the PC to control the SoftRock T/R...
Hi Frank, I'm not sure what the phase noise is for the 4046 but the linearity is very good and varies by less than 0.4% across the tuning range. It would be...
Just one other general comment. I'm really appreciating the comments received on this design. One simple change that I think should be made is to the resistors...
Thanks Bill. I got the Tx control via DTR working before the QSO, but I had two other issues - both related to using a laptop on my bench. The first issue is...
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