Hi Bruce,
The problem is that the original owner used absolute paths in his links. The
notebook on the page points to http://k7nv.com/notebook/ but if you just change
the URL you can still get there.
http://www.hamoperator.org/k7nv.com/notebook/
I will edit the HTML and see if I can fix some of those link.
73
Danny, K5CG
HH 550-000-0609
SKCC 14257
----- Original Message -----
From: "Leeson" <leeson@earthlink.net>
To: "towertalk" <towertalk@contesting.com>
Cc: "danny" <k5cg@hamoperator.org>
Sent: Tuesday, March 19, 2024 11:01:43 AM
Subject: Re: [TowerTalk] Prop Pitch operating characteristics
This is a great step, but I find I can't access all of the subfiles at
that URL http://www.hamoperator.org/k7nv.com/. However, you can find the
whole site at
https://web.archive.org/web/20210129145319/http://www.k7nv.com/
See also http://www.hamoperator.org/k7nv.com/index.htm
The Notebook is at
https://web.archive.org/web/20210204232420/http://k7nv.com/notebook/
I agree, it would be wonderful if someone could host this unique resource.
73 de Dave, W6NL/HC8L
On 3/19/24 8:38 AM, Danny K5CG wrote:
> As fate would have it, about 10 days ago I noticed a sub-folder on my web
> server named /k7nv.com and figured nobody was interested any longer so I
> deleted it, but here it is mentioned in this group once again. I seem to
> recall a long time ago I downloaded the entire website because it was going
> to go away and somebody was asking to preserve it.
>
> I've restored it from a backup in case anybody is interested.
> http://www.hamoperator.org/k7nv.com/
>
> If anybody is interested in hosting these files please let me know and I'll
> send you a link to a zip file of the whole site. There might come a time
> again when I forget what this is and delete it once more.
>
> 73
> Danny, K5CG
> HH 550-000-0609
> SKCC 14257
>
> ----- Original Message -----
> From: "Bob via TowerTalk" <towertalk@contesting.com>
> To: leeson@earthlink.net, "towertalk" <towertalk@contesting.com>
> Cc: npalex@bellsouth.net
> Sent: Monday, March 18, 2024 10:02:06 PM
> Subject: Re: [TowerTalk] Prop Pitch operating characteristics
>
> Looks like Dave came up with the info on the PP units. I found my file which
> contains a lot of what Kurt had copyrighted in 2005 and includes adapter
> plates, small, medium and some info on the large and extra large motors. What
> I have is a small, a large and two extra large PP motors which according to
> Kurt would be good for turning the whole tower. In the late 50's I used the
> small one on top of a power pole with a homemade gear driving a selsyn for
> direction indication.
> 73Bob K6OSM
> In a message dated 3/18/2024 4:58:59 PM Pacific Standard Time,
> leeson@earthlink.net writes:
> For a start, see
> https://web.archive.org/web/20200711193004/https://k7nv.com/notebook/ppinfo/
>
> See also
> https://ve3vn.blogspot.com/2015/11/choices-on-adapting-prop-pitch-motors.html:
> "On a bench test one drew 8 A and the other drew 7 A at 24 VDC."
>
> An interesting idea for using series resistors to reduce startup surge
> is at http://www.bigskyspaces.com/w7gj/NewMotor.htm
>
> See also https://www.eham.net/reviews/view-product?id=5837 comments by
> AC8DE: "I hadn't considered the high current required by a prop pitch
> with a 280' wire run and how that affected voltage drop and wire gauge.
> The minimum wire I could go with was 10 gauge, which causes a 10%
> voltage drop at nominal current draw of 5 amps. At the peak amps of 8,
> it hits 17%, but I expect that we will never see that because we will
> keep the ramp rate pretty low."
>
> Because my towers are some 400 feet from the shack, I built a remote
> power setup at the tower with a transformer 24 volt supply and relays.
> Because the motor is a DC type, the relays are wired to present a short
> when not rotating, which acts as a brake. Kurt made me a special mast
> connector with a rubber torque isolator (I have blueprints), which has
> worked brilliantly in our storms with gusts over 120 mi/h. I run Romex
> cable from the supply to the rotator.
>
> See also
> https://www.greenheronengineering.com/product/rotator-controller-prop-pitch/
> https://www.greenheronengineering.com/product/prop-pitch-28vdc-motor-rpu/
> http://www.zs6p.com/PPM_gearbox-sketches_and_notes.pdf
>
> If I have more info, I'll dig it out and provide it. I had a physical
> copy of the Section 12, Curtiss Wright 1943 Hollow Steel Blade Propeller
> (3 Blade) Service Manual that I shared with Kurt K7NV, but I don't have
> a scan. See
> https://app.aircorpslibrary.com/document/viewer/11a5e262-f115-4949-bbe5-8d3ab3803e59
> and https://www.ebay.com/itm/275383055212
>
> 73 de Dave, W6NL/HC8L
>
> On 3/17/24 6:40 PM, Bob via TowerTalk wrote:
>> Hi Norm,
>> This is Bob Schaefer K6OSM and I used a PP motor on a Hornet tri-band beam
>> back in the late 50's. I will look in my files to see what I can find on
>> these motors. I do recall that the elapsed time for a complete turn was
>> close to a full minute. I live in Gardnerville and Kurt lived in the
>> adjoining town of Minden, I never made personal contact with Kurt but
>> exchanged info with him when I lived in Idaho. I still have four PP motors
>> and will see if I can find anything that will help you.Bob K6OSM
>> In a message dated 3/16/2024 10:29:49 PM Pacific Standard Time,
>> npalex@bellsouth.net writes:
>> Hopefully there are some TowerTalk participants that are using PropPitch
>> rotor systems. I am looking for some operating characteristics relating to
>> supply voltage, currents and rotation speed (time to do 360*). I have been
>> a prop pitch user for many years and my 'go to' in the past on such
>> questions would be Kurt K7NV now SK or Joel K2QVB also a SK. My prop pitch
>> dates back to W0MLY Dick Mckercher, DXer of the 50's and 60' and creator of
>> Antenna Mart products. That is the background - Specifically I am look for
>> the DC voltage at the 'controller' and the voltage underload at the PP
>> motor. What is the 'start-up' surge current and the steady state 'run'
>> current. Those using Kurt's Green Heron controller, results may be
>> different as it supplies is PWM ramp up and down, but the 'run' levels will
>> be "DC" and useful data. Finally is there anyone who has the working
>> knowledge of Prop Pitch assemblies, or maybe have access to the information
>> that Kurt accumulated the could be made available us PropPitch users?Looking
>> for some help --Norm W4QN | | Virus-free.www.avast.com |
>> _______________________________________________
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