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   Home   Help Search  
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 1 
 on: Today at 02:07:45 PM 
Started by W6EM - Last post by ND6M
...edit...  After speaking with two vendors today at the Huntsville Hamfest that did set up at Xenia, they favor Xenia over Hara...

I also was at Huntsville, and I spoke with the DARA people at their booth,............. and did a LOT of listening to both them and the general Amateur community that visited them.

My questions (and questions/comments from other visitors) to them were answered promptly and openly.

I won't speak for DARA, or even attempt to paraphrase them, but, my specific questions concerning the flea market footing and interior lighting in the future were answered to my satisfaction.

From my perspective, the comments they received were about 90 - 95% positive.

 2 
 on: Today at 02:05:25 PM 
Started by KM6HFR - Last post by VK3YE
Video shows an experiment with a 1/4 wavelength vertical with a single radial running along the sand.

As expected disconnecting the radial made the signal almost disappear. 

https://www.youtube.com/watch?v=9iGu-T29gkQ


 3 
 on: Today at 01:56:37 PM 
Started by W9BKR - Last post by W9BKR
Looking for a longer Signal Link to FT-1000MP series radio cable.  Tigertronics doesn't make one and mine is a bit short for where I have to run it.

 4 
 on: Today at 01:45:08 PM 
Started by FOXBAT426 - Last post by KH6AQ
I believe the driven element near the center of the boom includes 20 meters and the extra dipole element includes 17 meters.

 5 
 on: Today at 01:16:22 PM 
Started by K9EEH - Last post by K9EEH
How do you upload qsos from wsjtx  adi files to lotw.
Says does not appear to be a trusted qsl file.

Thanks
Dick K9EEH

 6 
 on: Today at 01:11:02 PM 
Started by K3GM - Last post by KAPT4560
 I've noticed this certificate warning for the past couple of days. I have to click 'Continue'.

 7 
 on: Today at 12:49:27 PM 
Started by KF5RZG - Last post by KD7RDZI2
So, using a Bird 43 at the transceiver output - 100W. At the antenna base, just before the remote ATU, power is 64W CW continuous keydown. That calculates to 1.94dB loss at 14.07MHz. A bit high for 125ft RG-213, but there are 4 common mode chokes with connectors, two lightning arrestors and a wattmeter/SWRmeter inserted in between. I think I'm losing as much on those items as in the coax itself.

Bret/N4SRN

that is simple and informative! I would check the power at the antenna base before the remote ATU removing all other accessories. If you want to use your miniVNApro, you should see an SWR around 9 at 14Mhz which should translate in about 2db loss when no load is connected. The Wattmeter/SWRmeter has almost no losses except for the connectors. 4 common mode chokes seem a lot but I would keep one at the antenna feedpoint and one at the shack anyway. I would check the obvious and clean with isopropyl alcohol all connectors.
 

 8 
 on: Today at 12:14:41 PM 
Started by FOXBAT426 - Last post by FOXBAT426
BTW 15, 12 and 10 meter bands SWR all seem to be within range and close enought to 1:1.

 9 
 on: Today at 12:12:38 PM 
Started by FOXBAT426 - Last post by FOXBAT426
hi does anyone know what elements on the ta-33 jr warc correspond to 17 and 20 meters? on the 20 meter band im close to 1:1 at about 13.912mhz with swr being 3:1 or higher at 14,225 - 14.350 where i can operate phone. i would like the lowest point to be around .250.  On 17 meters its a similar situation the antenna is closest to 1:1 at around 17.881 where it should be somewhere between 18.110 - .168.  the antenna is put together according to mosley instructions. i double checked all lengths, element placement on boom etc etc.  Thanks again,  john

 10 
 on: Today at 11:56:45 AM 
Started by N4SRN - Last post by N4SRN
That sounds right with the addition of the MFJ-4118 bias-T ground (UHF connector shell) connected to the coaxial cable shield.


The diagram in the manual shows an MFJ-4118 bias-T connected to an MFJ-1316 power supply. The bias-T outputs three voltages (-12, 0, and +12V) to control the MFJ-2910 matching network. These voltages appear on the bias-T DC-RF output connector and can be routed to the modified MJF-2910 with a wire. To complete the circuit the bias-T connector shell is connected to the transceiver ground terminal.

I have a common ground bus bar that is bonded to my AC panel ground and tie all my components to that ground (PSU. transceiver, PC case, exterior ground rods, etc.)

So I run wire from common ground to RF Input shell of MFJ-4118 Bias-T, wire from RF/DC Output shell of Bias-T to RFC1. I'll give that a try! Kind of shot the weekend noodling that but will plan the work soon. Thanks for the help!

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