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My 1st homebuilt Hi-amp 12 volt supply used two transformers in parallel. The transformers were identical. The secondary had a black and a red wire, so I connected like colors together and connected an AC voltmeter across them. The primary wires were both the same color, so I connected them...
Got on the air late again tonight. Not much happening except on Chan 36 & 37. Had several long uninterrupted QSOs. It's nice later at night, as the stronger stations can still Dx, and the weaker wannabes can't interrupt much when the conditions are marginal. Plus, the big boys tend to have more...
The 1N4739A is a 9.1Volt 1 watt Zener diode. In the Cobra 139, D-48,49, & 54 are CV092 - 9.2 volt zener diodes. Any one of these should work. Good Luck.
- J.J. 399
I looked on RF PARTS, and they do not list original Toshiba 2290 or 2879 transistors anymore. Looks like HGs are your only option now. Unless you want to go with an LDMOS device. Lotsa power - small packege.
- J.J.
I'm not a Expert on amplifiers by any stretch of the imagination. But I feel like any transistorized amp that doesn't have real honest-to-goodness Toshiba 2879/2290 transistors in it is a waste of time. I get where Nomad is going with his question. Do you still have the DX500 ?? I think he...
Got on the air about 3pm today EST. Heard nothing. Put on the headphones, still nothing until 177 Ontario's audio came through so loud practically blew my ears away. Funny thing he wasn't moving my "S" meter at all. Then I heard an Oklahoma station. Same thing loud as hell but no "S" meter...
The band was hoppin' at my QTH today. Seattle, Salt Lake City, Omaha, Boise. All after 5pm EST. I shut down at 6pm for dinner and the band was still Raging.
- J.J. 399
I don't want to get into a pissing contest. What you say may be true on amatuer frequencies where there is no competition for airspace. But on the freeband freqs that I mentioned,there are so many signals out there that many times my meter will hover at S-7 or above. All things being equal (...
If you want to compete on 27.365 to 27.555+ , you have to have a power output of at least 600 watts or more to be heard above the pile. A pair of 1446s or 455s are useless when trying to talk DX consistencely in today's skip conditions. A pair of 455s or 1446s are useful as a driver for a 4 or...
Haven't had too much time for Dxin' this past week. My trusty Toyota Hilux blew a head gasket, and since I wasn't close to Medellin I was forced to tear it down and fix it myself. Since I was tearing it down, I decided to replace the leaky front crankshaft seal and the timing chain. Sent the...
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