On transmit with drive turned down, rig goes from drawing 1A to about 1.4A... bias on finals seems ok. Putting an ammeter in line with the drivers, no current (supposed to be 4 to 8 mA)... bias adju
Searching the Ten Tec list archives to help fix your current Corsair project rig and finding posts about the Corsair II you bought back in 1997. Damn. Bill W1PA
Corsair owners, check your manual. Can someone confirm that the wire that must be unsoldered and an ammeter inserted to check the driver bias current is the red wire with the ferrite bead _outside th
Think I located it. Finally had a chance last night to 1) check the ALC diode on the SWR board -- its ok 2) open up the PA module and take some voltages/transistor checks Check both drivers and PA tr
Also, Im noting that the drivers (MRF476, collector tab) need to be isolated from the grounded heatsink, correct? hmmm... wonder if driver shorter, or shorted to the heatsink... high current melted f
My restoration project continues... My project 540 has great receive audio, but very distorted transmit audio, as if it was being overdriven. Power out into a dummy loadlooks good, but on another rec
I have a Delta and Omni-A, so I am setting the ALC/Drive correctly. I'll try taking the finals out of the equation. I also note there are bias settings on both the finals and the OT-TR assembly that
Good point, Wade. I put a dummy load on both the 540 and the other RX. I also tried to work a station on 20m last night, and they said "I hear someone calling, but you are very distorted".I swapped
Update Due to having a second rig (a Triton IV), as well as some extra boards I have picked up over the years, I was able to swap out all of the critical boards in the rig, including the PA module, w
Resolved. After finally doing some real voltage checks per the manual rather than just the board swaps, I found the +8 (REG) line at 13.8V. I ordered and replaced the MC1723CL on the source logic boa
I received a re-string kit from Ten Tec this afternoon, but no diagram -- I got PTO removal instructions, but not a cord diagram. Anyone have either a drawing or picture of what is should look like?
I tried to contact Jerry directly but the email bounced. Rather than sending snail-mail, does anyone have this fore-mentioned doc (word file) they can send me directly? The last item is available on
With my 540, I got a 262G that has two TO-3 pass transistors... they are marked: S S S PR216M (actually, based on mounting holes on the heatsink, it looks like there was originally one, and then it w
I love the multi-power-resistor ammeter shunt wrapped around the heatsink, btw. hmmmm.... I take it back. I googled pictures of the 262G and I don't see any other units with them. That may not be the
NO EXCUSES, PEOPLE! If you do not have a crowbar on your power supply, add one! Big time agree. Direct personal experience here... my first Ten Tec was an Omni-A bought new circa 1980 by my father (I
Besides my various Ten Tecs, I will occasionally refurb something else. I have a TS-50 that suffers the classic "leaky" electrolytic issue... (they leak and damage the underlying board traces). I nee
I had this happen on an Omni VI+, and I found a bad pin on a filter. Looked as though some contaminant had been there when the pin was soldered to the filter PCB, and it had not wetted well... the pi
I was giving my Delta II a "check-out" this weekend, and noticed an issue with the RX audio. The best way I can describe it is that it sounds like "de-sense" or strong adjacent signal overload... the
Three weeks ago I pinged this group as well as Amsat's for a copy of the manual, and was unable to locate one. I also checked the most common "manual" sites, with no luck. I finally called Paul at Te
btw, for the number of times Paul has sent me a knob or some other item "no charge", I was happy to pay it. Give him a call, it may still be on the copier... :-) -- I finally called Paul at Ten Tec s