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   Home   Help Search  
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 21 
 on: Today at 04:16:24 AM 
Started by AC4BB - Last post by AC4BB
   I don't think children have his voice?

 22 
 on: Today at 04:14:07 AM 
Started by JS6TMW - Last post by W9PMZ
That inspection actually happened to me last March in Dallas (but I am not in that picture).
It really ticked me off and it is not amusing that it happens...
Only in America do you have to prove yourself innocent before you can fly...
In the final analysis I supposed that after being scanned by the millimeter waves and having to be inspected in that they thought my package was a weapon I should be flattered...

73,

Carl - W9PMZ

 23 
 on: Today at 04:11:59 AM 
Started by W5JON - Last post by ZS5WC
 :)I run the Expert 1K-FA and with 10w drive I achieve 600w out on the Half Power setting.
I also know the gain is in excess of 18dB below 20m, but have never had any overdrive issues.

Reason being the Expert Amp is a clever bit of kit, greatly using fuzzy logic for most of its' functions, and is almost impossible to destroy OR over drive if you connect the required cables.
Importantly, the PTT  and ALC connections are required to keep the amp safe, and the TX signal clean.
The user manual also states you can leave the exiter's drive level at MAX--(e.g) 100w, and the amp. ALC will "learn" the drive level and correct via the fuzzy logic alc loop to reduce exiter drive.
I have tried it and it works, but I run 15W max rather to achieve required output.

The signal is clean, not overdriven, and amp is happy.
I think the outdated rule of 15dB gain could be retired, since modern amps are a lot more "intelligent" than their earlier cousins.

73 de William
ZS4L / ZS5WC

 24 
 on: Today at 04:04:47 AM 
Started by WB4SNU - Last post by KR4TH
I have a 66 ft end fed antenna with a 9:1 unun.  The feed line is 72 ohm coax.  I attached a 16 ft #20 wire and a 32 ft #20 wire to the ground lug of the unun. The 32 ft wire slopes down at an angle and the 16 ft wire is taped to the outside of the coax.  There is no rf in the shack. The rig expert show that the highest swr is 3:1 typically 2:1 or less on: 40, 30. 20. 17, 15, 12, 10. 

Suggestion:  attach a radial at the feed point to the ground side and see if that doesn't help

 25 
 on: Today at 03:47:20 AM 
Started by KB0TXC - Last post by SM5GLC
If losses are low, i.e. high-Q and very narrow SWR bandwith, the transmitting should provide a good signal. Rember that it would behave isotropic sending a lot of RF straight up. But receive is different as the capture area is less than a big antenna and the absolute signal strength will be proportionally lower. But that does not mean a squat if the signal/noise is sufficient.

 26 
 on: Today at 03:43:45 AM 
Started by AA4PB - Last post by SWMAN
PB. Thanks for the view..Awesome.

 27 
 on: Today at 03:42:20 AM 
Started by JS6TMW - Last post by G3RZP
I had a '4BA + 6BA  spanner' (in US terms, a wrench about 3 inches long for 6-32 and 4-40) nuts confiscated by the goons at Frankfurt. How the hell one was going to take over the aircraft with that, I don't know. In fact, it wouldn't fit any of the metric nuts on an Airbus any way!

One of the best I heard of was at a middle east airport some years back - may have been Abu Dhabi or Dubai. A very good looking Russian YL in trousers was made to take her belt off. Result as expected - trousers came down which was bad enough, but she had also gone commando! Apparently the security people had fits and were far more embarrassed than she was.......

 28 
 on: Today at 03:35:13 AM 
Started by DL1MRD - Last post by 9Y4NW
I usually print screen and save it under the call. That is after I send his report 3-4 times with no response. I mean NO RESPONCE.
9Y4NW

 29 
 on: Today at 03:28:59 AM 
Started by KE4AIF - Last post by KC1BMD
If you are referring to me, I didn't mean intentionally transmitting, say my full power (100W) from one radio into another. I was asking about the remote chance that a switch might 'leak' some RF from one rig to the other. While there is some risk, it seems that many people have used switches in reverse to select rigs and that high quality switches with decent isolation might lower that risk significantly. I still have mine connected.

 30 
 on: Today at 03:18:46 AM 
Started by KD9AER - Last post by KR4TH
I used an off center fed antenna for several years and found that unless my coax feed line was an electrical length of the lowest band swr was all over the place.  It worked best for me on 80-10, no warc bands, antenna was 128 ft and rg-58 was 85 ft or 3.5 mhz electrical length.  When I operated 10 I had to add a 5 ft piece of coax at rig, no tuner needed on 80, 40, 20 and 10. Try electrical length of lowest band

Experimenting is fun and educational

Jerry

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