From mboxrd@z Thu Jan 1 00:00:00 1970 From: chuck gelm Subject: Re: ANN: mt63lx version 0.5 Date: Thu, 15 Jul 2004 01:14:17 -0400 Sender: linux-hams-owner@vger.kernel.org Message-ID: <40F612A9.2060903@gelm.net> References: <20040715035315.28315.qmail@radagast.org> Reply-To: chuck@gelm.net Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20040715035315.28315.qmail@radagast.org> List-Id: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: Linux-hams List Cc: Dave Platt Hi, Dave: Thanks. I have added the linux-hams list back into the address as I still have unanswered concerns. Dave Platt wrote: >>"... >>The MT63 modem is made for single side band operation. The audio >>generated by the modem (sound card output) is applied to the SSB >>modulator. On the receiver side, the output of the SSB demodulator >>is put into the sound card input. ..." >> >> Am I correct in assuming that 'SSB modulator' is not SSB microphone >>input and 'SSB demodulator' is not SSB speaker output. > > > No, I think you are not correct. > > Most modulations of this general sort can work if you feed the audio > in through the mic input, and take the output from the speaker jack. > You may need to add a resistive pad (a simple volume control or > attenuator) to make sure that you don't overdrive the mic input and > cause distortion, and you might need to add a similar pad in the other > direction so that your rig's speaker output doesn't overdrive your > laptop's line or mic input. > > If your rig has an auxiliary-audio I/O jack (e.g. for connection to a > TNC) this is often a better choice, as the voltage levels expected on > this jack may be closer to what a PC sound card generates and expects. > > Using a PC-to-rig adapter which has a transformer isolation for each > audio line, and an optoisolator for PTT, is usually a good idea - it > prevents ground loops, can help keep RF out of the PC and keep PC > switching noise out of the rig. > > >>I didn't see any mention of kernel version or CPU speed or tools or... > > > I've run PSK31, and the MFSK codec in the gMFSK program, successfully > on a Pentium 233 MMX laptop. Dave: You make no mention of 'MT63' in your response. I have a BuxComm GL?-V which copies PSK31 and other emissions, although I have yet to have had anyone acknowledge my transmission attempts. I assume that this device will provide acceptable voltages to my SSB rig (Kenwood TS-50). This device and the accompanying software seems to receive fine on a 266 MHz Pentium II computer. I assume that the CPU speed is less important in transmiting than it is in receiving. Perhaps 'PSK31', 'MFSK', or 'gMFSK' implies ,MT63'. However I do not recall them being mentioned in the original message or attachment. I am still missing software requirements; kernel version, gcc, utilities, tools, ... Is 'MT63' a development project or is it really ready for 'user' deployment? i.e. Is it 'alpha', 'beta', or stable release? Regards, Chuck nc8q Eschew obfuscation! Espouse elucidation!