irl-fsk-1000.txt IRL FSK-1000 notes and such: From K1LKY Date: Mon, 02 Jun 2003 20:25:44 -0400 To: telegrapher@att.net From: Roy Morgan Subject: IRL FSK-1000 - unit and manual found. Cc: roy.morgan@nist.gov At 04:40 PM 6/2/2003 -0400, you wrote: Date: Mon, 02 Jun 2003 13:26:26 -0700 From: telegrapher@att.net To: Roy Morgan Subject: Re: [GreenKeys] Info wanted Roy, Check to see what the value and type of Fuse is located on the circuit board, right rear corner next to the power . Somehow i've lost the one i took out of there but i think it was a 3AGX, 1/4 amp @ 250V. Larry, Good news: 1) You have that fuse almost right: Bussman AGX 1/4 amp, 250 volts. This is a fast blow fuse. According to a Buss Fuse catalog listing, the AGX fuses are one inch long (normal fuses are 1 1/4 inch long). The AGX was formerly known as 8AG and "provides high speed action necessary to protect instruments." They open at 200 % of rating in 5 seconds. (the AGC normal types were formerly known as 3AG.) I would use whatever you can find that is 1/4 amp or even a bit higher. Rig a fuse holder, insulated, on pigtails if you need to.. If you find the old fuse, you can solder wires to that and use any fuse holder. (I dunno if I have any of those fuses here..) This fuse protects the circuitry of the unit. The rear panel mounted fuse (3AG 5amp slow blow) protects the whole thing (including the little fuse) and runs the loop supply and the auto start outlet. That outlet runs your printer motor/power supply if you use auto start. 2) I found the unit, and soon after I found the file with the manual.. Yes I did send Dick Dillman a copy of the manual. I have the schematic also.. funny I did not send him copies of that, too.. (?) But.. I can copy that and mail it to you. It's a big sheet but I'll reduce and put it on 11x17 sheets so it will be manageable. NOTES: 1)In my unit I find a shorting plug in the "Serial In" jack. You DO have to short that jack to get it to run normally. 2) Check the integrity of the line cord relief insulator. I tugged my unit to free the line cord from some unseen obstruction, the strain relief popped out, the hot wire shorted against the case and it arced and severed itself! Good thing the safety ground was intact. The safety ground (Green wire) is routed through the Molex Connector on the mother board.. this cannot be safe. I intend to connect the green wire directly to the chassis. The trouble I had was set up in advance: some one had applied some black silicone rubber to the inside of the strain relief.. This I suspec, was because the line cord is very thin and the strain releif insulator did not expand agains the thickness of the cord enough to seat properly. I will fix all that on my unit.. (and post a notice to Greenkeys tomorrow about it all.) Trouble shooting: If you have an audio signal generator, you can check the thing's functions by feeding it a tone and varying the frequency up and down and watching the meters or the signal at the Scope Output jacks. Use a low signal level to avoid the limit light coming on with moderate settings of the input level control TP-1 is the output point of the audio input amplifier. TP-2 is the output of the Space bandpass filter stage 1 TP-5 is the output of the the Mark bandpass filter stage 1 TP-3 is the output of the Space bandpass filter stage 2 TP-6 is the output of the Mark bandpass filterstage 2 TP-4 is the output of the Space bandpass filter stage 3 TP-7 is the output of the Mark bandpass filterstage 3 These are both connected (via an isolating resistor) to the "Scope Output's", so look there for proper audio signals TP-8 is the signal rectifier output and low pass filter input (with the normal reverse switch in normal.) TP-9 is the low pass filter output TP-14 is the Main Summer output. TP-16 is the signal to the loop driver stages and should be: > 0v for Mark < 0v for Space (both with the normal reverse switch in normal.) The Mark and Space LED's are fed from this point and should turn on and off in accordance with the signal on TP-16. The little knob (unmarked on mine) between the Delta F and Input Level knobs is the autostart threashold adjust pot. That's about it for now.. without repairing this darned line cord I can't fire this one up and see what it does. É Roy To: Roy Morgan Subject: Re: IRL FSK-1000 - unit and manual found. Boy you talk about info. I don't think what i got from Dick with this unit even came closes to what you've told me. Thanks tons Roy. Digikey has the fuses, number i sent you earlier F-601-ND is an 8AG type fuse with the measurements to fit. I may just order a box or two of them so if others have the same problem, i'll have a fuse or two for them. Another list member has the same fuse problem. I'll pass along your notes to him as well. Definately info to put in the file. Other than it not responding to space tones when "space" is selected it seems to work fine. When in FSK mode both lights and meter respond properly. Just doesn't when its in space only. Thats one of the reasons i need a schematic. Address is: Larry Godek P.O. Box 2013 Mesa, AZ 85214-2013 Thanks Roy. Larry From: "Don and Diana Cunningham" To: "WB6BLV Central California" , Subject: Re: [GreenKeys] FSK-1000 Date: Sun, 18 Feb 2007 17:13:11 -0600 John, I didn't see any answer go by. Did you find a schematic for your FSK-1000?? I will locate my info if not and get one off to you. 73, Don, WB5HAK ----- Original Message ----- From: "WB6BLV Central California" To: Sent: Sunday, February 18, 2007 10:09 AM Subject: [GreenKeys] FSK-1000 From: chrise@pobox.com Subject: Re: [GreenKeys] ilr fsk1000 board Date: May 13, 2013 9:39:41 PM EDT To: jay@ewarg.org Cc: greenkeys@mailman.qth.net Anyone on the list have a schematic for the iRL FSK-1000 TU? My manual is missing that page. Seems to be a very good TU and compares favorably with my Dovetron. John WB6BLV@inreach.com On Monday (05/13/2013 at 09:54AM -0700), Jay wrote: Anyone know what the SCT-100 rev B board in the IRL FSK-1000 is for ? Appears to be hooked to autostart. I believe that is a "Single Card Video Terminal" built by Xitex. It might look like an S-100 bus card, has an MK3870 microprocessor on it? I have a manual for the first version, circa 1978, which I got from the estate of SK OM W0AUS. He purchased the kit version of the first revision SCT-100 in March 1978, for $157. Xitex Corporation P.O. Box 20887 Dallas, TX 75220 Does both ASCII and BAUDOT, takes a parallel keyboard in as well as serial data and produces RS-170 composite video or video with separate horz and vert sync as a strapping option. -- Chris Elmquist N0JCF