There are two approaches.. If the tube you're sticking it into has an ID very close to that of the OD of the insulation of the inner coax, then you can probably use the databook values for the coax.
RG-8, RG-213, solid dielectric... 31 pF/ft.. If it's in a tube that just snugly fits where the braid used to be (or, you left the braid on..) then this number works.. if it's in a bigger tube, the ca
Some GPS units can set their DATUM to NAD83.. GPS, by default, uses WGS84.. Off hand, I can't recall, but I think NAD83 and WGS84 are fairly close (within a matter of a few meters)... The topo maps a
You have to watch out if you use a topo map.. Make sure you read the stuff in the lower left corner that defines which projection and datum they are using. Many topo maps are based on NAD27, but they
components. multi-KW that It's way extreme beyond what's needed for ham gear, but, in the spacecraft business, the usual requirement is demonstrated capability with 4x rated power (actually twice vo
Power Rating All products made by the RADIO WORKS will handle the legal power limit, unless it is specifically designed for low power or receiving applications. Since The RADIO WORKS advocates adher
wound, 23-turn coil of small-diameter coax. An academically UF6 is hideous corrosive stuff ( Teflon was invented as a pump seal for UF6) used in, primarily, isotopic enrichment processes.. You're thi
One could probably approach this statistically using something like the NCDXF beacons. Log beacon strengths 5 minutes on antenna A, then 5 minutes on antenna B, etc, for a suitably long test period
I haven't actually seen one of these antennas, but I have looked at their website, and have seen similar antennas.. Indeed it is complicated. Antennas with lots of conductors closely spaced tend to,
But what is "performance"? Consistent gain and pattern regardless of orientation? F/B ratio F/Sidelobes ratio Forward gain Forward directivity Broadband feed point impedance so losses in Tx line are
And you tell the neighbors and HOA that you're conducting a "homeland defense exercise" during the contest? ("I'm sorry, I'm not at liberty to disclose any of the details of the exercise.") Or, do yo
Propagation predictions can come from VOACAP (ITSHF is the name of the package, and it's free from NTIA to download). There was an article about VOACAP (which is, by the way, based on the old IONCAP
Exactly so.. just so you recognize the limitations of your modeling (which, by the way, I too am interested in... looking forward to HFTA, which will do a lot of this) IPS uses a different modeling
The "standard coverage" varies a lot from locality to locality, and from time to time, depending on the "perception of risk" and loss exposure of the insurance company. I'd venture to say that in Sou
I would guess some form of silicone gel. As you probably know, silicones are available in a bewildering variety of forms, viscosities, stickynesses, etc. When wires were pulled out, did any adhere to
There is also some nifty stuff that is a plain tape that melts at a temperature lower than that required to shrink heat shrink. You wrap the joint in this tape (which has no adhesive), slide the heat
Yes and no. It isn't sticky or adhesive at all, but, if the object being wrapped up has too many holes that get filled, it's hard to separate, and might leave little globs behind. I don't know how st
Several approaches spring to mind, and some analysis as well.. Look at your flow rate and the pressure you're using and see if you can bound the number of pinholes. Flow through a small orifice is so
One generally wants more than one lightning rod ("air terminal" in lightning protection-speak), particularly if they don't stick up very far above that which is being protected. The currently fashion
For those looking for a document describing overall grounding techniques, in excruciating detail, the FAA has a spec for their facilities: Lightning and Surge Protection, Grounding, Bonding and Shiel