[Milsurplus] Milsurplus Digest, Vol 184, Issue 69

Sat Aug 17 10:52:14 EDT 2019

Hi Dave
You know after I wrote the message this morning I thought it might be a
aircraft beacon! I didn't think about Shannon Airport local to us. I should
have recognized the call sign as EZF as I work with the Airport as chief
pilot and coordinator of our Sheriff's Office Drone program.  
Thanks for the info on the antenna which makes a lot of sense I am using my
inverted V 80 meter antenna at the moment. It works better than my butternut
vertical which I know the polarization is bad because most everything Man
made is vertical polarized. That's HF LF 101 ! I  and was thinking about
asking what is a good LF antenna that people that are serious about LF are
using. Could you give me some info on your antenna? I am all about building
an antenna now.

Thanks so much 
Mike

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Subject: Milsurplus Digest, Vol 184, Issue 69

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Today's Topics:

   1. Re: 800 Cycle AC Meter? (howard holden)
   2. CW VLF Frequency  ID (mike christie)
   3. Re: CW VLF Frequency ID (David Stinson)

----------------------------------------------------------------------

Message: 1
Date: Sat, 17 Aug 2019 07:34:33 +0000
From: howard holden <holden7471 at msn.com>
To: David Stinson <arc5 at ix.netcom.com>
Cc: "Boatanchors at mailman" <boatanchors at mailman.qth.net>,
	"milsurplus at mailman" <milsurplus at mailman.qth.net>
Subject: Re: [Milsurplus] 800 Cycle AC Meter?
Message-ID:

Content-Type: text/plain; charset="utf-8"

All I can tell you is the one on my GO-9 has been working for 10+ years now
on 60 cycles almost daily and sometimes on for days at a time with no ill
effects. Never gave that a thought. I?ll have to take its temperature, maybe
tomorrow. I did compare it once to my DVM, and the readings were quite
close.

73, Howie WB2AWQ

Sent from my iPhone

> On Aug 16, 2019, at 21:39, David Stinson <arc5 at ix.netcom.com> wrote:
> 
> Given an AC voltmeter, FS 15VAC.
> The meter face specifies 600-800 cycles.
> Is it reasonable to assume that there is less iron in this meter, vs. one
designed for 60 cycles?
> If so, and the meter were used at 60 cycles, would it just read
incorrectly,
> or would the movement overheat?
> 
> TNX 73 Dave S.
> 
> 
> 
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------------------------------

Message: 2
Date: Sat, 17 Aug 2019 08:13:22 -0400
From: "mike christie" <MZFB at aol.com>
To: <milsurplus at mailman.qth.net>
Subject: [Milsurplus] CW VLF Frequency  ID
Message-ID: <[email protected]>
Content-Type: text/plain; charset="us-ascii"

Good Morning to all

I got my RAK 7 running last night and was tuning around and found a
continuous CW signal around 233 Kc.  (Band 5 on the RAK)  I listen for a
long time for a station ID but nothing came through.  The station
continually sends Z F E Z .  Anybody got an idea who this station is and
what it's purpose is?  I'm in Fredericksburg, Va. listening to this.

I tried using one of the SDR sites to see if I could find it on there for a
better frequency but couldn't find it on the one SDR site  I tried.

Thanks 

Mike

W1ZFB

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Message: 3
Date: Sat, 17 Aug 2019 09:10:50 -0500
From: David Stinson <arc5 at ix.netcom.com>
To: milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] CW VLF Frequency ID
Message-ID: <2738e4fb-d3b6-980c-2792-ea5bda25676a at ix.netcom.com>
Content-Type: text/plain; charset="windows-1252"; Format="flowed"

Good Morning.
Your local Fredricksburg Non-Directional Beacon, used for aircraft 
navigation, is on 237 KC and will continuously send the callsign EZF.?? 
Try running the RAK just below regeneration and see what the signal's 
modulation sounds like on AM.
There are still a lot of these MF-LF NDB transmitters around- many 
people enjoy chasing them as DX targets- but they are dropping fast as 
we become more and more reliant on the fragile web of GPS navigation.

Look for these NDBs in your area, assuming they are still on the air:
351? MSQ? Culpeper
382? IQK Louisa
396 APH Ft. A.P. Hill, God rest him.
400 NHK Patuxent River
223 DA? Ft. Belvoir
332 DC Washingtoilet

You can find a great map of NDBs with locations and IDs at:
http://www.fivegulf.com/ndb/

If you decide to chase NDBs, you will need something better than a 
random wire or an HF dipole.? Such antennas pick up common-mode and 
other noise, which will bury most signals.?? On LF, low-noise is much 
more important than sensitivity.?? A simple ferrite loop antenna with 
amplifier will allow you to null-out local noise sources.? My first "dx" 
reception on 630 meters (473 KC), the receive antenna was a Palamar LA-1 
ferrite loop- a little box and coil sitting on the desk.?? Recently 
built a big open loop, 5 feet on a side in prep for 630 meter operation 
this fall.

GL OM ES 73 DE Dave AB5S

P.S. Many people use "E-Field Probes" and think they are the best thing 
since sliced bread.? I've been working with great success on LF since 
1983.? E-field probes are "good" if one has compared them only to random 
wires or HF dipoles, just as a man dying in the desert from thirst would 
think water from a pig-wallow was "good." E-Field probes are noise 
magnets and will bury signals in the hash.? If these folks ever used a 
well-designed amplified loop, they'd throw rocks at E-Field probes.

On 8/17/2019 7:13 AM, mike christie via Milsurplus wrote:
>
> Good Morning to all
>
> I got my RAK 7 running last night and was tuning around and found a 
> continuous CW signal around 233 Kc. ?(Band 5 on the RAK) ?I listen for 
> a long time for a station ID but nothing came through.? The station 
> continually sends Z F E Z .? Anybody got an idea who this station is 
> and what it?s purpose is?? I?m in Fredericksburg, Va. listening to this.
>
> I tried using one of the SDR sites to see if I could find it on there 
> for a better frequency but couldn?t find it on the one SDR site ?I tried.
>
>

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End of Milsurplus Digest, Vol 184, Issue 69
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