This is a very attentive user who listened to the birds outside the amateur frequencies. They are there precisely because the manufacturer took this into account when developing the design and choosing intermediate frequencies. In any case, all old devices need periodic inspection and adjustment.
Came in late Sunday night when was just about to QRT...couldn't wait until tomorrow! Birdies are something we all have to live with I guess. TNX for sharing Stefan! 73 - Dino KLØS
Thank you Stefan for another interesting repair video. That has to be the best box I have seen un-boxed. I am surprised by the lack of shielding - too much input from the bean counters I fear. Would it be at all useful to lift the board a bit and clean the ground contact areas between the PCBs and the chassis? Regards, David
I have had a 450Sat for 30+ years, and it will receive right up to 40.000 Mhz. Also, I've gone through the PLL/VCO alignment a few times, and I can always adjust to the specifications found in the service manual. I only watched half of the video, but I'll watch the rest in the morning and make any comments that might be of assistance.... 73, Jordan VE6ZT
Just to follow up...With no antenna connected, I can only just barely detect that birdie at 3689.17 khz and it only gets weaker with the AIP on. I cannot detect the other birdies on 40m that you mentioned. Further, the VCO2 voltage at TP3 should vary greatly as you adjust TC1 in the VCO2 module. It should range from ~ 2V to over 5V as you adjust TC1. It is not unusual to have those VCO trimmer caps fail as they are plastic. I've had to replace several of them in my TS- 450, 850 and my 790A radios. I replace them with ceramic trimmers that fit the through-hole pattern. Lastly, my 450S will receive right up to 40.000 Mhz, but it's possible that the EU version is different. I hope this info is of some use Stefan....73...Jordan VE6ZT
dr Jordan, tnx for your info. Right about these plastic trimmers but here they are OK as i´ve measured at the VCO voltage. Birdies: Yes, they may differ from unit to unit depending upon versions and so....
