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   Home   Help Search  
Pages: [1] 2 3 4 5 6 ... 10 Next
 1 
 on: Today at 08:34:38 PM 
Started by VE3VEE - Last post by WA3MD
Heres a general bureau QSL question. Has anybody received a card from the Bosnia (E7) bureau recently. I have many cards that are 4 and 5 years old and go to stations who use the bureau but to date I havent received any cards from E7. Just something I noticed (I know the bureau is slow but just curious if anyone else noticed same thing).

 2 
 on: Today at 08:31:19 PM 
Started by KD8MJR - Last post by KD8MJR
The Blacked out comms story was certainly a hoax but the light following them was real.
I saw the footage and listened to the conversation in A documentary.  You can hear when they ask Houston for the posistion of the boosters.  Then an airy silence when they are told they are several thousand miles away.  It certainly was handled professionally and Aldrin has since tried to clarify his UFO type statements and say that he thinks it was some kind of reflection, but adds he is not sure because it looked like a hollow cylinder.

73
Rob

 3 
 on: Today at 08:19:18 PM 
Started by KC8KTN - Last post by KA4DPO
I just took the IQ test and it directed me to a CB site. Huh

 4 
 on: Today at 08:11:30 PM 
Started by K7JQ - Last post by N7OR
Do we know if it even is a SDR DDC radio?

For all I know it could be another hybrid DSP type with a slightly better scope display on it.

I'm excited if it's a fancier 7300, not so much if it's a fancier 7600 if you get my meaning.

 5 
 on: Today at 08:11:29 PM 
Started by N2RRA - Last post by N2RRA
OK, so this weekend I will be in the Catskill regions of New York. I'll be operating as a SOTA operator and will be including 6, 2 and 432 weak signal.

My question is:

For those who have not worked many of the grids center of the state of New York which grid squares, or mountain tops would you guys like to work?

Depending on quantity of responses I will be willing to accommodate to give you that grid Square, or SOTA mountaintop.  I will be operating HF bands 40m -10m as well. For weak signal work I will have directional antennas for 6, 2, and 432. As usual on all of my outings I will as well be recording my operations. Within a week I will have a video edited and uploaded to YouTube. Hope you all enjoy it.

Hope to hear some requests if interested. If not plans are to hike the highest in the area. We'll be solar powered so I'll be operating just before sunset hoping to catch some Tropo or better.

73

 6 
 on: Today at 08:00:23 PM 
Started by KO4JY - Last post by KE4XJ
Spend money on very good antennas. Run 1500 watts out all the time. Use separate specialized receiving antennas.

I bet we will still enjoy Ham radio without all the above. Contacts will just be more valued. But if you can afford all the above, go for it and add even more pleasure. I refuse to worry about the future.

 7 
 on: Today at 07:50:24 PM 
Started by HAMSTUDY - Last post by WB6BYU
If your analyzer doesn't give you the sign of the reactance then it isn't as useful, but with some
work you may be able to figure it out.  Unfortunately, some of the techniques that might work
when connected directly to the antenna can trip you up when you try to measure the antenna
through a length of feedline.

Perhaps the simplest is, if the impedance reads, say, 80 +/-j 100 ohms, would be to calculate
a capacitor value with approximately 100 ohms of reactance and stick it in series with the load.
If the reactance doubles, it was capacitive.  If it drops to near zero, it was inductive.

Often a more convenient method is to translate the impedance into parallel notation and do the
same thing, using a T connector on the analyzer and connecting the test reactance across the
open end.  You don't even need a precise capacitor / inductor value:  by adding any reasonable
capacitor and watching the change in measured reactance you should be able to tell whether
the reactance magnitude increased or decreased.

It's much easier, of course, when the analyzer can resolve the sign of the reactance.

 8 
 on: Today at 07:32:28 PM 
Started by K6ECS - Last post by N0NB
I see now what you're up against.  Are those N connectors at the tops of the cavities?  If so, perhaps it would work to put an N tee on it with a 50 ohm load on one side and an antenna analyzer that incorporates a VNA on the other.  For example, I have the Rig Expert AA-230 ZOOM analyzer and it will measure return loss.  It may not hurt just to check one cavity to see if you get reasonable readings.

The Sinclair brochure doesn't spec return loss but it does note that the maximum input VSWR is 1.5:1, which works out to a return loss of 14 dB.  Obviously, the higher that number is (greater than zero), the better.

 9 
 on: Today at 07:31:51 PM 
Started by KD8TFG - Last post by KD8TFG
I just got this power supply (supposed to be working) I put my meter on it 0vdc, checked the fuse it was good, transformer hums I took the case off and everything and it looks good to me no shorts on the board. I need to know where to start getting this going again.

 10 
 on: Today at 07:31:22 PM 
Started by VE3VEE - Last post by N4UFO
FT4JA QSL in the mail today... fancy envelope, too bad the stamps aren't real; very nice looking.

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