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 21 
 on: Today at 06:22:53 PM 
Started by KD9BVO - Last post by KD9BVO
Hopefully closer?



Any issues with 0.1 uF for the cap at DDS output? As you may have noticed, I am not very experienced with this  Smiley

KD9BVO

 22 
 on: Today at 06:09:01 PM 
Started by KD0ZGW - Last post by KK5DR
"Care and feeding of power grid tubes." CPI/EIMAC.
Very technical, but gives you the info to understand exactly how a vacuum power tube works. Describes typical amplifiers, broadcast transmitters, etc.
A must read for anyone that want to understand what is actually going on inside that tube.

 23 
 on: Today at 06:05:22 PM 
Started by K5GS - Last post by WO7R
Very nicely stated, Paul.

The way I refer to it, though, is that financially, we all of us rely on the kindness (significant kindness) of strangers to make DXpeditioning happen.  Because, whatever we do individually, collectively, we don't do enough.  The operators put up a great fraction of the money.

And, too many hams do seem to have this fantasy that the OQRS/QSL card stuff is a major funding source.  It just isn't.  It may make the difference between break-even or not, but regardless, the participants for anywhere interesting can be expected to contribute at least 10K or 20K of their own money and no chance whatever to get much of it back.  Indeed, as Paul nicely states, they may have to kick in some more after the thing ends.

That is the reality of big time DXpeditioning as we have it.

 24 
 on: Today at 06:02:03 PM 
Started by KD9BVO - Last post by WB6BYU
No, it looks like you have the base and the emitter connected together on the transistor.
When you took out the capacitors, don't reconnect the wires that went to it, just leave them open

The DDS output goes to the base of the transistor (through a capacitor is a good idea.)  The resistor
goes from the base+ DDS at one end to ground at the other end.  The ground output of the DDS gets
connected to ground also.

 25 
 on: Today at 05:57:46 PM 
Started by KQ0C - Last post by KQ0C
I'd be very interested to see how you calculate efficiency. According to the published data I can find, the radiation resistance of a 24 foot bottom loaded vertical on 160 meters would be about 1.1 ohms versus 35 ohms for a full sized antenna. On 80 meters the radiation resistance of a 24 foot bottom loaded vertical would be about 3 ohms. (All verticals, even full sized also give up about 6 dB in far field ground losses versus horizontally polarized antennas (though this is partially compensated for by lower radiation angles).

As Tom Schiller has said "All antennas work... but some work better than others".


 26 
 on: Today at 05:57:30 PM 
Started by AA4BQ - Last post by AA4BQ

i AM LOOKING FOR MY ORIGINAL ELMER WHO GAVE ME A KEY AND CODE PRACTICE OSCILLATOR AT THE AGE OF 13 IN CARBONDALE, IL.  MY UNCLE, DR. GEORGE GLENN, WAS A FRIEND OF YOUR FAMILY'S AND I CAME OVER AND SAW YOUR HOMEBREW 2 TUBE RIG. YOU HADE YOUR CONDITIONAL OR GENERAL AND YOU WERE ABOUT 13 OR 14 AT THE TIME. IF YOU REMEMBER HELPING A KID FROM GEORGIA WHO WAS VISITING AUNT AND UNCLE GLENN (DAUGHTERS BETH GLENN AND SHIRLEY GLENN) PLEASE LET ME KNOW. i WOULD LIKE TO THANK YOU.

MY CALL: AA4BQ AND INFO IS CORRECT IN QRZ.COM

73,
BILL

 27 
 on: Today at 05:54:09 PM 
Started by KD0ZGW - Last post by AH6RR
Try the "Radio handbook" 22 edition by William I.Orr W6SAI .
good info


Yes I have a copy and it is very good well worth the investment if you can find one.

Roland AH6RR

 28 
 on: Today at 05:52:15 PM 
Started by WE2F - Last post by WY7RP
 I'm going to throw my hat in for the Argonaut VI. What an outstanding rig for home use. But, for hiking and backpacking i'd go with either at FT-817 or a KX3 depending on how much I wanted to spend.

 29 
 on: Today at 05:49:35 PM 
Started by KC3DWC - Last post by KB7FSC
Hi Glenn,

I have a FT-7900 and the older FT-7800.  I like both radios, and they both have a lot of features and offer operation on both 2M and 70cm.  My only complaint is that they don't have a very large speaker, and are a bit hard to hear under certain conditions.  I added an external speaker to my 7900 and no longer have any problems hearing the audio.  Both rigs have been solid performers, and I have had zero problems with them over the last 3 years.  I bought the 7800 used.

Be aware that although the 7900 is a dual band radio, it will only operate on one band at a time.  There is no crossband repeat capability.  As far as programming, I did both of my radios by hand.  It took some time, but it can be accomplished without a computer.  I programmed in close to 200 memories on both radios.  I like the memory banks and hyper memory functions.

Maybe the grass is greener on the other side, but if I were to do it again and I was buying new, I would probably try a Kenwood TM-V71a.  It is currently listed on HRO for $364.95 whereas the 7900 is listed for $323.95.  Maybe you have a line on a 7900 that is cheaper.  Also, if you haven't already, spend a little time on the eham reviews.  You'll get a pretty good feel for the good, bad, ugly, etc... of the radio.  Have fun!!

Wane - KB7FSC

 30 
 on: Today at 05:49:00 PM 
Started by KA4NMA - Last post by K0BG
David, while your description is more or less correct, your assumption of where the current node is, does not take into effect any ground losses present. We must remember, that the resistances which constitute the input impedance of any vertical, are in series. Without taking the ground losses into account and/or ignoring the feed line, results in a fictitious result.

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