De :9H1JS @9H1AX.SLM.MLT.EU Para :ALL @WW Fecha :04-Apr 21:49 Mensaje :179840 T¡tulo :Am7910 & 2400 baud Path: !EA7RKC!ZS6BJU!ZL2TMQ!N0RSE!OZ1PPN!OZ2BOS!OZ4PAC!OZ4BBS!OZ4BOX! !DB0HRO!DB0SAW!DB0NHM!DB0BAL!DB0MER!DB0LPZ!DB0HOT!DB0ZWI!OK0PKL! !DB0MAK!DB0PV!DB0ISW!OE7XBB!DK0MUC!OE7XCI!IW3AQL!IN3TUR!IW2KTL! !IK2FMJ!I4EUM!IK6RUY!IW0QMN!I0INU!IW0CFV!I0PMW!IW0FGK!IW0FEF!IK8LOV! !IW7BNO!IK7MXD!I7NRG!I8WYA!I8CWM!IW8PHV!IW9CNZ!IT9LCP!IW9EDP!9H1BBS! R:960404/2149Z @:9H1AX.SLM.MLT.EU #:245 [Sliema, Malta] FBB5.15c $:460-9H1JS From: 9H1JS@9H1AX.SLM.MLT.EU To : ALL@WW #TST HOST v1.42a, Local time: Thu Apr 04 22:26:08 1996 Hello... I'm Brian from sunny(*) Malta. We are currently trying out the 2400 baud mod (with 3.6864MHz clock) Any tips on problems encountered appreciated. Here are a few to start you off:- 1. Tx modulation level is critical, over-modulation has an adverse effect on error rates. To check, set up loopback using two rigs, and use a long sequence of capital 'XXXXXXXXXX' characters to watch error rates drop while trimming that pot! Once all is adjusted, performance is excellent - the error rate drops to zero! 2. On receive, the 'Equalizer' feature must be on for best results. 3. On my modem, with Ef-7910, the clock level needs to be 3.15V pk-pk, for correct operation (determined by trial and error, prototype has a potentiometer regulating the clock - I know it sounds outrageous, but, as Charlie,9h5dv would say, "It works!"! On my modem, using a standard clock results in a horrific noise (could be instability). This could be due to my pcb layout or the duty cycle of the derived clock waveform - I will try to invert the waveform and see what happens... E-mail address - briane@mbox.vol.mt WWW home pages - http://www.lookup.com/Homepages/79251/home.html (*) The word sunny is in no way meant to serve as advertisement to local tourism ;-) 73's from Brian, 9H1JS @ 9H1AX ***