Wednesday, March 23, 2011

Vintage Krementz Jewelry

simple DSB transceiver for 10 Mts

This simple transceiver, cited by George (G3XBM) on your blog and appeared in a forum published by an author who does not mention his license, is based on a hybrid NE602 and mixer SBL-1. The latter are difficult to find in Argentina but in some households may obtain or otherwise can be bought online and receive by mail. The domain
QRPp projects DSB designs are taking some momentum. This occurs as an expression of balance between making the provision of telephony and maintain equipment minimal. In this blog we have explored designs that try to get a team SSB QRPp with the intensive use of SDR techniques (which is still in conceptual design phase). But teams like DSB give a benefit at a fraction of the complexity of assembly. At the same time, nothing prevents the use of SDR techniques to "increase" provision, in particular the reception. Much has been discussed on two negative aspects of DSB type design. One is the sideband "spurious" and its ability to generate interference and other problems peculiar to tune in a direct conversion receiver and the image problem. Regarding the first authors tend to outline the argument, which I share, that if the output is from a few hundred mW interference that can generate side-band "extra" are not deleted in the order of any computer that can generate a conventional 100W. Regarding the second problem although there can be mitigated through the use of software receivers (type M0KGK or similar). One aspect which caught my attention repeatedly DSB designs is that they are a source of inspiration for designs based on SDR SSB, in effect, with a few adjustments to the oscillator and the mixing process, account settings and components are similar.
I have not made much progress in QRPp designs, some of the austral summer that does not invite to be working in leisure, and partly because I have been little time at home during the summer (vacations and business trips later.) But winter comes ..... so there you go heating welders!

0 comments:

Post a Comment