Re: [soft_radio] ESS Time Machine

[tasa]

Hello Per-Tore,       ESS time Machine is not designed good. It is necessary to have an power divider at the input of two mixer. Realization in schematic will degrade performances of mixer very much .The simple solution is 3 times 15-18 Ohm resistors connected in star configuration or divider in phase like PSC2-1. The same situation is in transmit configuration it is necessary to change R19 ,R20 to about 470 Ohm and R21 decrease to 100 Ohm  potentiometer to avoid possibility to the self oscillations of some sound card outputs . Output is necessary to be connected like RX with star 3 times 15-18 Ohm.   GL + 73 Tasa YU1LM/QRP ----- Original Message ----- From: Per-Tore Aasestrand To: soft_radio@yahoogroups.com Sent: Sunday, July 10, 2005 10:21 PM Subject: Re: [soft_radio] ESS Time Machine Notice that the LOs are fed out-of-phase to the mixers. 73es, Per-Tore LA7NO At 11:31 10.07.2005, you wrote: >Hi, all concerned: > >If one inspects the ESS Time Machine schematic: > >http://www.expandedspectrumsystems.com/TMschematic.pdf > >the r-f signal appears to be fed in-phase to the mixers. > >Other designs have 180-deg splitters here. > >Have I missed or misunderstood something? > >TIA & 73, > >Dave, N3HE >Cincinnati OH > > > > > >Yahoo! Groups Links > > > > +-----------------------+------------------------------+ | Per-Tore Aasestrand   | E-mail :  [EMAIL PROTECTED]      | | P.O. Box 1708 Nordnes | Voice  :  + 47 - 55 32 32 35 | | N-5816 Bergen, Norway | Mobile :  + 47 - 92 04 44 76 | +-----------------------+------------------------------+ YAHOO! GROUPS LINKS  Visit your group "soft_radio" on the web.    To unsubscribe from this group, send an email to:  [EMAIL PROTECTED]    Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.