Ticom

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Posts posted by Ticom


  1. In a related vein, I was /P on 20 meters this past spring running an FT-817 off of a GoalZero Sherpa pack, and wondering why net control on 14300 KHz. was buried down in the noise. For those not knowing, 14300 KHz. is the frequency for the maritime mobile net and its net control operators are running legal limit QRO into some large beams so they can work maritime mobiles running 20 watts into a wire tied the mast.  Figuring the band was truly dead, as I went to shut down the station I first unplugged the Sherpa to hear net control coming in S9+. Worked him using 3 watts and a dipole off the internal pack in the '817.  Plugged in the Sherpa again and watched the noise floor go up 9 s-units.

     

    When I got home, I plugged the Sherpa into an O'Scope to find quite a bit of AC hash on the output. Have since discovered the same with most cheap "wal-wart" power supplies.

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  2. No 45V battery with the kick meter?!

    The battery that came with it was deader than Marley, and not planning any imminent Christmas Visitations. It was also an original Bell System Battery, and remains in my phreak collection.  By all accounts, the 45V batterys are hard to come by, and most techs modify their kick meters to run off a bunch of 9Vs in series.

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  3. 1/4 wave ground plane antennas work really well for their intended frequency of use, and they're cheap to build - just some wire and a connector.  You can also improve the performance of a lot of antennas by putting a 1/4" ground plane under them. Those of you who remember the old G-Net web site from the l0pht, their colinear performance was greatly enhanced with a ground plane under it.

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  4. I just generated a lower-sized PDF of the first issue, and uploaded it to my home page for those of you who don't want to give your info to Magcloud:

    http://www.digivill....nt_Techie_1.pdf

    Basement Techie is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3 .0 United States License .

    You are free :

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    With the understanding that:

    Waiver — Any of the above conditions can be waived if you get permission from the copyright holder.

    Public Domain — Where the work or any of its elements is in the public domain under applicable law, that status is in no way affected by the license .

    Other Rights — In no way are any of the following rights affected by the license :

    Your fair dealing or fair use rights , or other applicable copyright exceptions and limitations ;

    Apart from the remix rig hts g ranted under this license , the author's moral rights ;

    Rig hts other persons may have either in the work itself or in how the work is used , such as publicity or privacy rights .

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  5. Much obliged. The Science Workshop link is worth the article alone. I was under the impression that a good one was ~US$10K.

    TEMPEST - one of those things you dream of finding at the estate sale of a deceased alphabet soup agent ;-)

    Good ones for hobbyist purposes are pretty cheap, and you always find them at hamfests.

    Funny you mentioned estate sales, that's where I found my RS-125. It was wasn't the "-7" TEMPEST package, however.

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  6. I'd like to find a real Bell System KSU at some point though.

    Ask around your local communications companies. When I did that sort of thing not too long ago, we had lots of customers who were pulling those things out and dumpstering them, especially when remodeling the building.

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  7. Is there a reasonably inexpensive method of scanning for RF in an area without using a radio? I have six different radios all dedicated to difference frequencies (e.g. 2 Meter, 60 Meter, 222 MHz, etc) so it isn't simple for me to scan full spectrum all in one go.

    My reason for asking is I have noticed a number of new antennas in the area and curious as to what they are broadcasting. A couple of the antenna designs give hints at the broadcast frequency range but the others I am unsure about.

    All the best

    bT

    Spectrum Analyzer. You can build a decent one for around $100, or find an older used one like a HP8554 for a couple hundred.

    If you look around, you might even find something like a CEI (Watkins Johnson) RS-125 receiver system which is what they used for TEMPEST back in the day.

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