[Elecraft] OT:. G5RV's

[William Lagerberg]

And you now dear list users, i have a G5RV and i really love it it works allways, and give’s me good results :-))

Just have to say that.

Regards William PE1BSB



> On 05 Aug 2016, at 16:58, Phil Wheeler <w7ox at socal.rr.com> wrote:
> 
> Alas, the poor G5RV.  Now that its been flogged to death, maybe we need a new target -- say the Windom?
> 
> Phil W7OX
> 
> On 8/4/16 10:22 PM, Wes Stewart wrote:
>> The tuner loss also depends on how it is adjusted. For example the very popular high-pass Tee with three adjustable elements has an infinite number of possible combinations that will effect a match on the same load Z.  One of them is the lowest loss solution, all of the others aren't.
>> 
>> As I said earlier, in a letter to Dean Straw dated February 2, 1994 I offered an example where the SPC tuner, then current in the handbooks, could be used to match an impedance of 4.34 +j46 to 50 ohm. (I forget where this came from but it was a real possibility)  I assumed Qc = 1000 and Ql = 300 (generous). I used Touchstone to calculate the minimum loss and maximum loss solutions The best case was 1.6 dB and the worst case was 7.8 dB.
>> 
>> With lower Q components, Qc = 500, Ql =200, the losses were 2.4 to 9.5 dB!
>> 
>> Wes  N7WS
>> 
>> 
>> On 8/4/2016 2:00 PM, Alan Bloom wrote:
>>> > It's a pity that too many newcomers, as well as many oldsters, are
>>> > enamored by this piece of wire.
>>> 
>>> The G4RV is definitely a compromise antenna.  However its advantage is that is has low-enough SWR to be easily matched by most tuners on a number of bands.
>>> 
>>> > ... the horrific losses that could be incurred even
>>> > with high quality tuners,
>>> 
>>> It's true that tuner losses are the manufacturers' dirty little secret. Loss is rarely specified, partly because it can be pretty bad, and partly because it is hard to measure, but also because it is not constant - it depends on the particular impedance being matched.
>>> 
>>> One exception is the old Drake tuners.  Their Pi-L topology makes the loss almost independent of the load impedance.  If you can get it to match, you know that almost all the power is going into the feed line. For example, the MN-2700 that I designed when I was at Drake was specified at 0.5 dB maximum insertion loss and I did a lot of testing and tweaking to achieve that on all bands.
>>> 
>>> Alan N1AL
> 
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