Hi Jack I found the TI calculator here: http://www.ti.com/tool/opamp-noisecalc Is this the one you are referring to? Anyway, I set up the parameters for the...
No, I didn't use that calculator. I developed my own spreadsheet analysis for the non-inverting case from the equations in TI's Application Note at: ...
Only 9 days until the MicroHAMS Digital Conference. This year, Ward Cunningham's presentation will have a Peaberry SDR transmitting PSK31 using a Raspberry Pi....
Hi Jack I found a problem. The spreadsheet uses fA not pA so I was out by 1000 for the current noise. The noise parameters should be: I-Noise 1hz: 50,000 fA...
Hi Rick 0.009 VAC out of the computer sound card will not drive the RXTX. You should see about a volt on an AC voltmeter at this point. This indicates that...
Alan and I have been having an offline exchange and we would both be interested in input from the group. Between us we have 3 RXTX builds for 10/12/15 meters....
With a 1:2 input transformer, the secondary should see 200 ohms as you say so that the input remains at 50 ohms for filters, etc. The lowest noise commonly...
For Sale: 1. Softrock RX Ensemble II - Purchased assembled from Five Dash on Mar 4th. 2. KM5H Enclosure purchased at same time. Both are as new - I have used...
If you suspect the SDR Software settings, try IQGEN and see what its output will do for your RXTX http://www.f4gkr.org/projects/iq-generator/ ... -- Cheers, ...
... Subject: [softrock40] uV/m to dBm ... Thanks for giving me the relavant information Jack. I did actually find these two sites but my mathematics teacher...
Hi David and Ken, The Dreambass works good also correcting the phase error in SDR# Be aware thad the sterio audio plug has the propper size otherwise you can...
... Subject: Re: [softrock40] Re: No RF Output from RXTX ... will do for your RXTX http://www.f4gkr.org/projects/iq-generator/ That only uses the default...
I use a hot air paintstripping gun (get the one with the temperature controller, costs about $50), a foil pie tin with a hole cut in the bottom slightly bigger...
I've been trying to get my Ensemble RXTX to work with my MacBook Pro running Win7 under Boot Camp. For a time I was convinced there was something wrong with...
TNX Alan.....you can see by the message I just added that I've determined that there is an issue with any sort of audio output under WIn7 on this Mac Laptop....
15/03/2013 23:53 Looking for a USB2SDR sound board. Anyone got one they don't need? I am in the UK, but shipping shouldn't be too excessive on something this...
David and Jor  Thanks all your interesting information and technical update. Just to say here I am getting used to the blue pyrotechnics now and and...
Hello, I have RXTX Ensemble for superband 80/40 and till today all worx fine. But today found strange behavior with image rejection. I have absolutely NO...
OK, I have my RXTX sitting here awaiting an antenna (don't ask OK, just don't) But, band pass filters not withstanding, what, if anything, is the difference...
This might be neat to try. Take a SoftRock Lite+Xtal V8.3 (or similar), interface to the Si570 via I2C with a Si570 Controller. Use one of Dave's, WB6DHW, all...
It will work out of band and you may be surprised how well. I checked out my 20 meter softrock by tuning a 50kw local am radio station on 1180 khz. They throw...
... Many thanks - I felt it ought to but ... So when I can get some wet string in the air I'll have a play. 73 Nick M0HGU -- "Out of Print" is bookseller speak...
Due to the low pass filters employed in the front end, high band builds work better on low frequencies than the other way around. I find WWV/BPM at 10 and 15...
