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#11
September 22nd 07, 02:33 PM
posted to rec.radio.cb,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
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What happened to the SkyWave 2879ABTC?
On Sep 21, 11:45 pm, Frank Gilliland
wrote: On Fri, 21 Sep 2007 07:37:54 -0700, Telspam Electronics wrote in .com: On Sep 20, 10:48 pm, Frank Gilliland wrote: On Thu, 20 Sep 2007 17:08:23 -0700, Telstar Electronics wrote in . com: On Sep 20, 3:03 pm, wrote: Oh...your bias is magical? It uses no components for compensation? I always suspected your design to be that of an imaginary nature. Not magical... it used the base-emitter voltage drop of an MJE3055T (mounted directly to heat sink) to track with the 2SC2879 power transistors. Since it used a transistor with gain... it worked so much better than just a plain old diode on the sink for tracking. It worked fantastic... How well it works depends on how well you hacked the design from this link I posted (while pointing out some of the many problems with your earlier splatterbox): http://www.ifwtech.co.uk/g3sek/tr-bias/tr-bias1.htm I was able to set set class AB bias ( I chose about 200Ma) on the power transistors... and hold +/-5% collector current changes from -40 to +100C heat sink temp during amp operation. That's interesting. Previously you said your bias scheme can "hold the 500mA bias to 10% from -30 to +85C". It's funny how many times you have changed the specs. I especially enjoyed the time when you changed the power output specs three times in one week after you were caught fabricating them instead of actually measuring them. Oh well, such is the life of an internet-educated hack. But alas, there's still one unresolved issue here, Brian.... where's the schematic? Glad you're back Frank... I never left, Brian. your always good for a laugh. I'm glad you're amused. But don't you think it's time for you to get a job and relieve the financial burden on your parents and the Illinois welfare system? If I lived in that state I would be outraged that you are leeching my hard-earned tax dollars, but I don't. I guess people over there prefer to coddle malingering basement-dwellers. You are certainly lucky to live in a place with such generous folks, Brian. Over here on the left coast you would have to support yourself with gainful employment. And I hope that gives you something else to laugh about, cause the thought of you actually working for your keep sure leaves -me- ROTFLMMFAO!!! BTW, where's that schematic?- Hide quoted text - - Show quoted text - Keep up the amusing posts Frank... www.telstar-electronics.com |
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