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Maybe just a little more clarification on that. When you mix and take the sum, you don't change the side band. When you mix and take the difference, you actually invert the side band. The relationship

The crystal filter is just a gateway it doesn't carevwhat type of rf gets through...? We're simply choosing which half of an am signal to pass...? By moving the signal up or down the spectrum by

Yeah you could try an external pull up resistor of 10-47K. Perhaps the internal pull up resistor is faulty. 73 Allard PE1NWL

Gordon, thanks for that explanation. Although I understand sidebands in general, I now better understand how the crystal filter works! 73! -- Ryan Flowers - W7RLF MiscDotGeek.com (

Hmmm.... some confusion here. If double sideband looks like ..;;\\ //;;.. then upper sideband looks like //;;.. no matter whetehr it is made by a bitx, an iCOM or a Heahtkit...... In all cases, the

Perhaps, I'll have to check that. However, both my test sketch and the B40 sketch are using the same hardware and setting or attempting to set the same 5Mhz frequency on the AD9850.? With that set of

Richie, ok so I guess the passband crystal filter is symmetric in which case it doesn't care. Gordon, so if the receiver is decoding in USB and receives a USB signal like "..::?" (as would come from

?typo: meanto to say, ""the filter can't tell and doesn't care whether the spectrum going through it is upper or lower sideband" ________________________________ Sent: Tuesday, November 28, 2017 12:35

?the filter can tell and doesn't care whether the spectrum going through it is upper or lower sideband..... What makes it upper or lower sideband is the relative relationships between the radio

Hey David, I figured this out last year when I could never resolve SSB in any superhet that I built. I got a copy of EMRFD and it all came together. Here is my attempt at explaining it. First, the

Hi Allard at A2 I measure 2V and can not find any short to ground. Next thing I will try to wire a resitor from A2 to +5V and see what happens - comming back. Thanks Gert

So, as I understand it, a SSB signal is where half of an AM signal and the carrier are suppressed. For illustrative purposes, I'll draw a full AM signal like ..::||::.., where || is the carrier and

?Getting it to do upper side band isn't that terribly difficult, a small mod or two in the raduino sketch will do it ---- but it is just as easy to upload one of Allards' sketches and then it handles

Btw, we are building it inside a Hello Kitty or Frozen lunchbox for her

Yes. She's 9. We just want a pushbutton to switch from LSB to USB and back again. So, that's what I'd like to figure out how to do. I've got a heatsink for the final and removed C91 and c92

That heatsink only 1cm thick but works OK I like to look after the pa I waiting on a kit from EA3GCY called ILER-17+ dds Going to put it on 15,12,10m its my new winter project chris

Maybe not enough coffee but at first I though you meant something like this... https://www.amazon.com/Plugable-Sharing-One-Button-Swapping-Computers/dp/B00JX3Q28Y And did I read that correctly?? Your

No but, If you want any of the features that Allards sketch provides then go for it. You could add some components to the BFO and have USB. Raj

Yep feel free I have built 3 sets all the same looking I had the dds programmed for me so no credit for them. Chris

?with THAT huge heat sink.....it is no wonder it never gets hot!!! ________________________________ Sent: Tuesday, November 28, 2017 9:36 AM To: [email protected] Subject: Re: [BITX20] First real try