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I don't want any of my energy going outside the filter or coming in from outside. I would swap 1,2 and always do. It probably makes a tenth dB difference altogether but I don't want even that error.

Thanks for the offer, it would be nice to compare. I'm not going around buying sound cards for the fun of it, I own several sound cards (most free) and I would like to know how well they do in my

Alex, After exchanging the emails with you regarding the BSoD that I was getting every time I closed Rocky I called Creative Labs and had them UPS me a USB MP3+ so that I could load it on my laptop. I

Yes and NO. It turns off all variable gain but it turns on a FIXED gain. Go the AGC/ALC setup tab and set this fixed gain to ZERO 0dB and now you are all set. Bob N4HY KD5NWA wrote: -- Laziness is the

No. Each of the capacitors is charged around the 0-2pi circle at different turn on and different turn off phases. 0,90,180,270 degrees but each capacitor is turned on and off only ONCE per carrier

I think it is settable in the agc section of the setup screen. 73 de Phil N8VB

I'm not trying to measure the noise floor, I'm trying to measure the lowest discernible signal "MSD" A voltage reading on a meter by itself means nothing since it's not being compared to a known

Hi Milt, Sounds interesting... Do you have a circuit diagram of this arrangement anywhere? Thanks. 73 de Phil N8VB outputs.

Here's a question and a comment for Phil, Alex, Tony, et al-- In the SoftRock40 the transformer provides both non-inverted and inverted RF to the switches. The outputs of the FFs are gated so that the

SWCad will allow you to output a wave file from the simulation. .wave c:\mysound.wav 16 48k V(left) V(right) is the directive. The cool part is that you can play the wave files in PowerSDR. As a

Now that softrock-40 mania has passed and softrock Mark 5 mania is approaching, will be soon had SDR-908 mania?? George, how can you even begin to estimate how many of these to make available in the

In a real radio yes, but I want to make sure that it is running flat out full gain on the sound card.

I want to try to measure the noise floor of my SR-40 setup and will need to have the AGC completely turned off. If I turn off the AGC of the Flex software will it really completely turn off all forms

I have models for both ideal and real. If it were only that simple... For example in the modeled QSD circuit that I am using, even if both switches are on at the same time there is no "short circuit".

Hi Kees, It 'tis a good idea. Take a look at http://ewjt.com/kd5tfd/sdr1k-notebook/sr40/sr40-freq-doubler.html Cecil - WA6RDY

KD5NWA wrote: That's one of the reasons why I chose the ADG704 for my QSD. From the datasheet : PRODUCT HIGHLIGHTS ................. 7. Break-Before-Make Switching Action. ................. 73 Alberto

Milt Cram wrote: Quite true. If it can be of help, I saved this page from a site of Advanced Microwave Inc. where the relevant math is laid down. http://sundry.i2phd.com/ImageRejection.html 73 Alberto

Are you emulating real switches or perfect instantaneous switches? If you are emulating real switches the your conclusions are correct in that a slightly less that 25% waveform is the most efficient.

Tony Parks wrote: Tony, If I might add my two cents-- Your second question is the more important one. The loss of gain due to clock skew is not very significant for desired signal detection. However,

Hi Tony, Let me take a look at this and report back. I reran the simulation with a 4 switch QSD using two signal integrating capacitors. I am taking the 4 switch QSD with 4 integrating capacitors and