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  1. unit_399

    Parallel connection of Plate Transformers

    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...
  2. unit_399

    11 meter is very quiet?

    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...
  3. unit_399

    858 president Washington needs saving.

    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
  4. unit_399

    Best Small amp selection for SSB

    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.
  5. unit_399

    11 meter is very quiet?

    I heard several Delaware stations, but not your callsign. J.J,
  6. unit_399

    11 meter is very quiet?

    Never was too good at hide and seek LOL. I called out CQ-WDX on all chans from 36 to 44, but no luck. - J.J.
  7. unit_399

    11 meter is very quiet?

    I was on until 6:30 pm when conditions totally dropped out. Didn't seeyour message until today. My wifi doesn't make it to the shack. j.j.
  8. unit_399

    11 meter is very quiet?

    Had several good QSOs yesterday. Oklahoma, Nebraska, and several Texas stations. But not one WDXer in the bunch. I'll try again today. J.J. 399
  9. unit_399

    Best Small amp selection for SSB

    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...
  10. unit_399

    11 meter is very quiet?

    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...
  11. unit_399

    11 meter is very quiet?

    Probably was me, but I was pointed to the Northwest. - J.J. 399
  12. unit_399

    11 meter is very quiet?

    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
  13. unit_399

    Can someone explain why anyone would use a SD1446 instead of MRF455?

    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 (...
  14. unit_399

    Can someone explain why anyone would use a SD1446 instead of MRF455?

    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...
  15. unit_399

    11 meter is very quiet?

    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...
  16. unit_399

    11 meter is very quiet?

    Went down to the shack at about 10pm to disconect my antenna. Fired up the Old Cobra and every channel was dead except 37 (27.375) . At first I only heard 2 stations talking. They went on and on, so I finally called "CQ-DX." Man did I open up a hornet's nest. It felt like the whole world was...
  17. unit_399

    Uniden 980 DDS VFO

    A goal without a plan is just a wish. 808 Delaware Failure to plan, is planning to fail.
  18. unit_399

    EXCESSIVE COAX

    Captain - Thank you for making my point. I never mentioned that the inner core would be an inductor, I just said that it will form an inductor, which the shield will do. If common mode currents are present on the coax, choking them off inside the shack is not a good idea as I see it. Instead of...
  19. unit_399

    DX500 DEI to HG swap

    Ever since Toshiba Stopped production on the 2290 and 2689 transistors, several companies have offered "CLONES" of them. All I can say about whether they are as good as the original Toshibas is to open one up and look at the construction. Check the gold bonding wires as to number and quality...
  20. unit_399

    EXCESSIVE COAX

    NEVER coil up excess coax !! Coiled up, It will act as an Inductor and cause multiple problems. String it out along the floor and run it back and forth, but never let it cross itself, The best solution is to shorten it, but if you'd rather not do that, just make certain that it doesn't cross...