My BITX-40 only came with the Raduino, It works fine, No issues, In fact I've two BITX-40 here and both work as they should , Both are the versions with the Raduino ... Both are on LSB, No mods to the BFO on either BITX-40 S .... Plug the SDR kits VFO into either BITX-40 and they immediately change to USB .. 4.8 to 5 MHz ?on USB ... Anyway I've given up on the SDR kits VFO at this time, It's in the junk pile waiting for another day .
Regards?
On Wed, 8 Feb 2017 at 19:43, Jerry Gaffke via Groups.Io
<jgaffke@...> wrote:
Marc,
OK, back to your original post:
> ?I've recently built a SDR kits VFO (3.5 to 160 MHz) .. It's working fine, But when I connect it to my BITX-40 the LSB is flipped to USB ..I've put the IF as 12.0 MHz and the VFO range is 4.8 -5 MHz .. To cover 7.0 -7.200 ... Any ideas why it flips the Sideband ??
Let's get this straight. ?The Bitx40 worked correctly out of the box at 7mhz on LSB, using either an analog VFO or the Raduino. ?You disabled the original VFO (removed L4, unplugged any Raduino) and plugged in your SDR Kits VFO into the Bitx40's DD51 connector. ?Didn't mess with the BFO. ?And now the Bitx40 is tuning 40 meters as before, except you are on USB? ?
You said that "the VFO range is 4.8-5 MHz". ?Did you use your scope to check the frequency coming out of the VFO? ?I'm betting it is up at 19mhz, not 5mhz. ?Might be less confusing to just tell the VFO an offset of zero, then set the VFO freq to 5mhz. ?See if that gives you 7mhz LSB operation.?
Jerry?
?Wed, Feb 8, 2017 at 10:55 am, Marc Jones wrote:
Hi, I've tried IF frequencies of 19 MHz , 26 MHz, 12 MHz ... Basically any frequency I could think of .. None of them work the ?BITX-40 on LSB, The frequency of 19 MHz results in basically a dead radio, No RX At all , Same goes for 26 MHz, It's a strange one, This SDR kits VFO works fine, It looks good on the scope and goes upto 160 MHz easily.. But it just won't work on the BITX-40 ..
?
Marc Jones