Hi, I decided to do Bitx20, I use 10 MHz xtal, card is over and I get energy, whistling, what could be the problem. Nobin was wrapped with 8 rounds t50-2, thank you.
Disconnect the 1uF capacitor at base of AF preamp Q4 and isolate if the whistling is due to audio stage or RF combined.
73
Rahul VU3WJM
On Wednesday, 31 May 2017 11:48 PM, huseyin.guner via Groups.Io <huseyin.guner@...> wrote:
Hi, I decided to do Bitx20, I use 10 MHz xtal, card is over and I get energy, whistling, what could be the problem. Nobin was wrapped with 8 rounds t50-2, thank you.
T50-2 will not work it is powdered iron core inductance will be very low use FT50-43 or smaller FT37-43 ferrite cores for the transformers.. FT37-43 is used in current series of SND Bitx.
73
Rahul
On Thursday, 1 June 2017 4:51 PM, Rahul Srivastava via Groups.Io <vu3wjm@...> wrote:
Hi!
Disconnect the 1uF capacitor at base of AF preamp Q4 and isolate if the whistling is due to audio stage or RF combined.
73
Rahul VU3WJM
On Wednesday, 31 May 2017 11:48 PM, huseyin.guner via Groups.Io <huseyin.guner@...> wrote:
Hi, I decided to do Bitx20, I use 10 MHz xtal, card is over and I get energy, whistling, what could be the problem. Nobin was wrapped with 8 rounds t50-2, thank you.
