[600MRG] "The Lowdown Amateur Radio Antenna for 630 Meters Model 630.PD"

[John Langridge]

Hi Greg,

I can't speak to what's in the handbook but what we are dealing with
here is basic antenna theory with a focus on reactive antennas.  If
there is a section on THAT in the handbook and you can extract the big
picture, it should be translatable to 472.  I doubt you will find a
"plug tab A into slot B" instruction short of someone actually writing
an article for the handbook to such effect.

Check N6LF's stuff.  Rudy goes into great detail on antennas and may
be one of the best resources on the internet right now.
antennasbyn6lf.com

ON7YD has a great reference for 2200m, which works for 472 as well in
terms of a general guide but I can't find the link right now.  Check
the other site he maintains that also has info:
http://www.472khz.org/

Im also a big fan of direct elmering, even if its by email or
telephone.  Ops can always can check Ralph's op list and find someone
nearby to contact or even someone at random.  There are a lot of heavy
hitters in the trenches every night that would probably be willing to
answer questions and help if asked.

Good luck and hope to hear you and others on the air soon.  Sunspots
are becoming more prominent as the new cycle progresses but there is
still time to enjoy decent-to-good low MF conditions.

73!

John..


On 1/11/22, Greg KF5N <greg.electricity at gmail.com> wrote:
> I like the design as I could use it even in my relatively small back yard.
>
> The availability of a turnkey antenna and other gear is good, but I'm not
> even sure there is that much easily available reference material if you
> want to build your own.
> I recently ordered the 2022 ARRL Handbook, and found only one page on LF
> propagation.  Did I miss something, or is there no other information on the
> ham LF allocations in the latest handbook?
>
> Let's say I was a newbie interested in trying out 630 meters.  Where would
> I go to find construction details for an antenna equivalent to this
> commercial offering?
> Long ago (1980s) I built and operated a Lowfer Beacon.  There was the
> series of books by Ken Cornell, and a couple of enthusiast periodicals on
> Lowfer and other LF topics.
> Lots of antenna topics and construction articles in those publications.
> Is there something equivalent to this today for 630 meters?
>
> 73 Greg KF5N
>
> On Tue, Jan 11, 2022 at 8:03 AM John Langridge <kb5njd at gmail.com> wrote:
>
>> Good morning,
>>
>> Jamie, N2VJ, reported this morning on SLACK that a US-based company is
>> producing a portable, turnkey 630-meter vertical antenna system.
>> Originally developed for BC medium wave AM as an emergency continuity
>> system, this model has been modified for 472-479 kHz.  You can see the
>> specs here:  https://theradiosource.com/products/antenna-630pd.htm
>>
>> Jamie indicated that the company is probably testing the market and
>> the price may be somewhere in the $890 USD range.  While that may seem
>> pricey to some, there are a lot of people out there still waiting for
>> a turnkey option and engineering and materials are expensive these
>> days.  Yes you can build this stuff for a LOT cheaper but there are a
>> lot of hams today that can't or won't so here is an option to fill the
>> void.
>>
>> Have a look and show some interest as doing so often drives product
>> development and innovation.
>>
>> Jamie explicitly noted that he is not endorsing this product and he
>> has no financial interest.
>>
>> 73,
>>
>> John KB5NJD
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