David Lankshear wrote: > After implementing Elecraft's VFO tuning hash modification, there was still > hash to be heard on my K3, most notably in the bottom 40kHz of 10 metres. > > > > The problem was finally eased by replacement of the two silicon diodes used > in the modification. Although no fault could be found with the original > diodes - they were a couple from a large bandolier of 1N4148 purchased from a > major retailer some time ago - their replacement with a couple of 1N4148 > diodes recycled from redundant equipment reduced the hash level to below the > received antenna noise level on 10m. > > > > The only difference I could find between the two pairs of diodes was that the > Vf on the original diodes was higher than that of the replacement diodes. > Original diode Vf 0.75v, replacement diode Vf 0.71v, all measurements taken > at 5mA. > > > > If anyone is still experiencing VFO tuning hash after making the > modification, it might be worth trying a swap out of the diodes. Perhaps > using Schottky barrier diodes might be even better? > > > > Hats off to Gary of Elecraft support for his patience and for always being > there when needed. Also to Dale, who could hear my K3's hash over 8,000 > miles of landline. > > > > 73 DaveL G3TJP Has anyone tried Schottky diodes? I will myself but haven´t had time to deal with it yet, too busy with other things in life right now.
Jim SM2EKM ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
