Very good, I understand much clearer. I get signals thru on usb but much lower than lsb.
The usb setting is at 8ma, so sounds like C91 and C92 need to go.
No clicks, no birdies? great software.
Thanks!
Joe
VE1BWV
On Sat, Apr 29, 2017, 7:31 PM Allard PE1NWL <
pe1nwl@...> wrote:
Hi Joe,
How is the receiver doing in USB mode? Is the signal strength same as in
LSB? Or is it less sensitive in USB than in LSB?
If USB reception is also poor then removing c91 and c92 may help.
In LSB mode the local oscillator frequency is about 12 - 7 = 5 MHz.
In USB mode we move the local oscillator to the high side of the IF, so
the frequency is then about 12 + 7 = 19 Mhz.
At 19Mhz, the capacitors c91 and c92 will attenuate the LO signal much
more than at 5 MHz.
In order to compensate for this we use a higher drive-level in USB mode
than in LSB mode. If your USB drive level is already at the max (8mA),
then removing C91 and C92 will help.
73, Allard PE1NWL
On Sun, April 30, 2017 00:03, Joe wrote:
> Hello,
>
> Having great fun building these kits and playing with excellent coding....
>
> I have just completed my 2nd Raduino.? This one will eventually have the
> 80 meter band and used for the Digital modes.
>
> I uploaded the ?latest version 1.08.? Did the Calibrations (love the
> menus) etc and all seems to be fine except for one issue.
>
> When I transmit in LSB - i get 8-10 watts --- Great
>
> When I transmit in USB ?- i get about 2 watts. ???
>
> In my other Raduino bitx40 - ?I used some other firmware with a rotary
> encoder etc and they indicated I needed to remove c91 and c92 in order to
> get usb to work.
>
> Otherwise the USB side signals get mostly filtered out. ?
>
> Does your LSB / USB ?functions need these capacitors to be removed ?in
> order to pass the most signal as well?
>
> Thanks
>
> Joe
>
> VE1BWV
>
