Re: Buy in INDIA
DM - had to send reply this way as you have rigorous Spam filtering on and private email was REJ . If you could tell me "the appropriate place " where this trimmer should be put (Well documented - as per a piece of instruction arriving with the kit maybe ??) I will forward it on to him.toggle quoted messageShow quoted text
he is about to bundle the Bitx40 kit as Repaired by Him so it can receive and sent it back to the buyer in Spain and tell the original buyer (of a whole set of them) what he is working on is mostly a crock. He is fed up with spending time. on it as it was a mess in terms of performance as it came out of box. I have seen his wiring photos and it all looks nicely done and heat shrunk. He was using the screen of a KX3 as a spectrum analyser to diagnose things. so he is not some plumber trying to do RF wiring . How can anyone solve problems if the on the web schematic is not up do date on this diode change out bizzo ? Perhaps it is.. perhaps there are Multiple master schematics floating around ?? "you get that on the Cloud."
If you forward technical insights with specific URLs, I will forward them.
It is possible that the diode pair he has is defective or that it is a mixture of silicon and schottky. Such assymetric pairs are made for use as PIN diodes; what is to stop them getting onto the assly line in Mumbai. ? All the evidence is that the diodes are being over powered in TX ; it now works in RX ie at low diode forward current with a MAJOR user rework. since the diodes were feeding into a CT 500R load with Pi downstream before the change .. Do you know what changes were made on the Tx amp section prior to BM section to ensure diodes stayed in A exp (I) functional range - which is required for a diode based modulator to work ??
Timothy E. Fidler : Engineer BE Mech(1) Auckland , NDT specialist AINDT UT /RT3 , MT2 CB #2885,