You might need a more solid ground plane. ?Perhaps stitch some of the islands on the backside together using traces on the front side. ?
You are using 1n4148's in the mixers, Farhan is using BAT54 dual shottky diodes. ?The shottky diodes don't need as much drive from the bfo or vfo as the 1n4148's do. ?Also, the two shottky diodes in the balanced modulator are guaranteed to be balanced, not so for two randomly chosen 1n4148's.
Looks like you have a totally different final amplifier. ?Farhan's push-pull IRF510's reduce the second harmonic, your single 2SC1971 may require more output filtering than Farhan's did. ?
Farhan's initial schematic showed lots of BC849's, but only because he didn't have a decal for 2n3904's. ?His current schematic shows 2n3904's.
On Fri, Apr 7, 2017 at 06:42 pm, JuanCarlos Berberena Gonzalez wrote:
Hi Fellows
This is only a prototype to work with a PCB.
I have the file with the Sprint layout from ABACOM.
Any concern about the design please forward to-Heriberto- cl2kmk@... ??
Qrv's
73's Jc
?
