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Art, That is a good question. The linearity of any preamplifier is going to depend on biasing, how it is configured, the type of device used, etc. That is why you won't see any device specific spec on

wrote: ............. That is very good news. A while back I posted a message (No. 484) suggesting the same but did not get any feedback. I suppose 6m is not a high priority to the readers of this

Hi Alex, Great! The support for multi-band will be a huge hit. Also, the wav playback-record is a very welcome addition since (I think) you will be able to play wave files recorded with PowerSDR and

I have just released Rocky 1.1. Two new functions hav been added. 1. Multi-band support. The drop-down button to the right of the frequency display allows you to select one of the pre-defined bands.

Hi Bill, Not, not at all. It is not a Tayloe detector anymore. The active opamp LPF provides the filtering that the capacitor/antenna impedance of the Tayloe detector did before. 73 de Phil N8VB opamp

Hi, This is the path that I started down over a year ago. I was going to basically duplicate the front end and 1st mixer of the K2 along with most of the K2's PLL. The K2 uses a DAC tuned PLL

Hello, Hide. I use a Soundblaster Audigy 2 NX USB external sound card on one of my laptops and it works well. I have no direct expereince with the exact card you ordered. I hope it will work ok for

Excellent idea, Bob !! That solves a lot of problems caused by "pushing" the existing parts to their limits. Cliff was talking about doing that at one of the breakfasts but I don't think he's built

Hi, I made a mistake that my PC has no "LINE-IN" input terminal,only MIC (Analog) input exists. So I can not "Null the Images" from adjusting SDR-Software.I've ordered the Ext.USB Sound Box as "Sound

Bill, The preamp is needed to overcome the 6 dB loss of the double balanced mixer. Bob WA6UFQ SoftRock

Hi Bill and the group, I'm trying to sort out a similar preamp issue. I'd like to put my softrock on 185 KHz and 137 KHz. On those frequencies, loops rule as far as receive antennas go. I personally

It looks like a good idea. It would solve a lot of direct conversion and DDS problems we have been talking about. But I would recommend avoiding putting a preamp in ahead of the SoftRock 30 Tayloe IF

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the softrock40 group. File : /SDSTransceiver Block Diagram.bmp Uploaded by : cat100bob

Consider using the SR40 as an 'IF strip', preceeding it with a MMIC preamp, some bandpass filtering, and a Diode Balanced Mixer using an AMQRP DDS module as the LO source. I have done that very thing

Milt, If it needs a symmetrical clock, I would recommend the sine wave to square wave converter used in the QRP2001 RF section. It just takes one gate, in this case it is an exclusive OR gate, but it

Wouldn't that defeat the filter properties of the Tayloe detector? Bill WB5TCO Phil Covington wrote:

P.S. I put a model of the capacitorless circuit to my blog at: http://pcovington.blogspot.com/ 73 de Phil N8VB wrote:

Hi All, For those of you interested in the performance of the QSD circuit in Softrock40: A few hours of modelling of the SR40 circuit leads me to these conclusions. 1) The circuit behaves like a

Hi Phil, I think that you are correct that we could eliminate the signal integrating capcitor. One of the circuits that I have been playing with does exacly as you have described - no C and an active

Interesting, if my capacitor is too big, I get a big hump in the center of the band-pass, where have we seen that before? When I say lower it, I mean really lower it, in this test to .001uF, signals