These Data were submitted on: Thursday, February, 19, 2004 at 09:18:01 NAME: Harm CALL: DK3BU CPU:: P II CPU Speed:: 266 MHZ RAM in MB:: 192 MB SOUND CARD:: SB PCI64 SOUND DRIVER:: Alsa from Suse Distr. ADDITIONAL CARD1:: AWE 64 PNP ISA VIDEO CARD:: Matrox Mystique VIDEO DRIVER:: mga LINUX DISTRIBUTION:: Suse LINUX VERSION:: 9.0 personell KERNEL VERSION:: 2.4.21 GCC VERSION:: 3.3.1 SVGALIB VERSION:: 1.4.3 LINRAD VERSION:: 01-13 TEXT: Some first comments about getting Linrad working: As my VHF/UHF-Station is built around some old Telefunken E-1506 receivers and the corresponding Telefunken SSteu 1370 exiters, feeding my transverters at 28MHz, I wanted to have the Linrad hardware as an add-on to this setup. So I extracted the LO of an E-1506 and built a 2 channel receiver for 28 MHz using 2 cascaded FM-Quarzfilters(10.7 MHz) in each channel, providing a +-6 kHz window around the receiver-frequency. It's built in the old fashioned way by using chambers for each stage. Mixers are 7dBm DBM's, even for the second conversion down to 9kHz. Standard diplexers and Fet-PostAmps are used, 9dB Norton-Amps followed by 3 stage BP-Filters on 28MHz providing an NF of abt. 14dB (SKTU). Matching and amplification between the Quarzfilters are made with J310's. I could not get the passbandripple of the two cascaded filters below +-1.5 dB, after calibration this is not a problem anymore. The biggest problem was to eliminate hum induced by some transformers of my station. I'm just trying to get some mu-metal sheets for better shielding, because the hum is being induced directly into the very sensitive AF-amp. Now that the hardware is working quite well, I'm busy adding a second rx-channel to the 2m-transverter to get some benefit out of it all, hopefully. 73's Harm Q&A: I don't know too much about Linux and started with a RedHat 7.0-Installation configured by advice Leif has given, to get my RX-frontend working. Unfortunately I could not install my SMC-Etherpower II and the SB PCI64 I wanted to use. When changing to Suse 9.0 (supports the used Hardware completely), I ran into an often discussed problem concerning Suse Linux and svgalib. My solution is using the svgalib.rpm ver. 1.4.3 from a Suse7.3 prof. distribution, with we found to be the last available. This package can be installed and it works. Maybe this Info is helpful. 73's Harm, DK3BU