[MRCA] MRCA Digest, Vol 228, Issue 5

Wed Apr 5 02:54:42 EDT 2023

Re: Contents of MRCA Digest, Vol 228, Issue 5

Today's Topics:

   3. ABA-1/SCR-515 question (MARK DORNEY) [re HOWLER]

==. ==

Around 1940 the British used a radio beam system to direct bombers that
used a "HOWLER", later called OBOE (because that's what it sounded like).
It provided Azimuth guidance from a rear position presumably at or near the
airbase the bomber took off from (or maybe somewhere else?).  I think US
IFF RADAR systems used a LOBER for Azimuth determination of a return pulse
from an aircraft. I don't know if any US IFF systems used a HOWLER, but if
so, it would likely have been for Azimuth determination. The fact of it
being an attachment suggests it is a LOBER, but does the manual otherwise
talk about a LOBER? I'll send some pix; let me know if you would like
HOWLER cites. The ABA-1/SCR-515 (pre- Pearl Harbor) is about the same era
as the British HOWLER system and maybe adopted it? 73 de Bart, K6VK ##

-- --
Bart Lee, K6VK, CHRS archivist and Fellow, AWA Fellow, ARRL Liaison

Texts only to: 415 902 7168

www.bartlee.com

{Bart(dot)Lee(dot)K6VK(at)gmail(dot)com}
<http://www.lawforhams.com/>

On Sun, Apr 2, 2023 at 4:20 AM <mrca-request at mailman.qth.net> wrote:

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> Today's Topics:
>
>    1. Re: Today's M&S Net Recordings (mstangelo at comcast.net)
>    2. Re: Today's M&S Net Recordings (comcast)
>    3. ABA-1/SCR-515 question (MARK DORNEY)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 1 Apr 2023 21:38:06 -0400 (EDT)
> From: mstangelo at comcast.net
> To: "mrca at mailman.qth.net" <mrca at mailman.qth.net>
> Subject: Re: [MRCA] Today's M&S Net Recordings
> Message-ID: <1893015286.1129035.1680399487049 at connect.xfinity.com>
> Content-Type: text/plain; charset=UTF-8
>
> Ray,
>
> My biggest problem when operating from home is the noise. I've listened to
> the net with my Harris 5000 but the reception with QRM does not compare to
> a modern transceiver that has decent Noise Reduction(NR) and Noise
> Blanking(NB). Ironically I've found the popular IC-7300 Noise Reduction is
> not effective on my noise. A Kenwood TS-590 and my Elecraft K3 does have
> effective Noise Reduction and Noise Blanking. I've heard the Yaesu FT-DX-10
> has effective NR and NB. I've found the Noise Reduction and Noise Blanking
> algorithms of the Airspy SDRSharp software effective and feed the baseband
> output of my 7300 to SDRSharp if I want to use the 7300.
>
> I'm curious if the latest generation of Military transceivers has NR and
> NB options. I'm trying to find of the Harris RF-7800-MP manpack offer these
> options but have't received a response to my inquiry. While is is not a Mil
> Spec set Elecraft has indicated the KX2 is used by US Special Forces. It
> has excellent NR and NB capabilities.
>
> The other option is to operate portable in a quiet area. I do this during
> the summer and am amazed of the low noise floor at a quiet site.
>
> Regarding antennas, I have an inverted L and a low 80 meter dipole. The
> inverted L is more effective as a transmitting antenna for the net and even
> though it is noisier than the dipole it is a more effective on receiving
> when used with Noise Reduction. My inverted L is about 35 feet high and 110
> long. I made it longer than a quarter wavelength on 160 so that it does not
> present a high impedance on 80 and 40. I find it does a good job 60 when
> matched with a tuner.
>
> My portable 60 meter wire antenna is a quarter wavelength. I try to get
> the vertical portion as high as I can, with a 20 foot telescoping pole and
> string out the rest as far as I can. This is fed againse 4 short radials. I
> also use a Hustler whip when space is tight.
>
> I"d recommend trying your vertical and connect a wire to the top if
> possible to make it at least a quarter wavelength.
>
> Mike N2MS
>
> > On 04/01/2023 2:31 PM Ray Fantini <rafantini at salisbury.edu> wrote:
> >
> >
> > For some months now just aint getting any love from sixty meters! Tried
> different radios and antennas but between the almost constant S6 to S7
> background noise on that band and the inability to hear Net Control it?s
> been rain no game for me. Have these dam Harris Falcons that I am going
> thru and between the 5022 that?s decided to stop working after I turned it
> off and the basket full of expensive memory cells that I have replaced just
> about have had a belly full of them but I do have one set up with a 5020,
> 125 watt amplifier and the 382 tuner and am thinking that maybe I can set
> up a thirty foot vertical out in the yard and try running that on sixty and
> see if life is any better?
> > Liked Eugene?s sound recordings, allegedly he is working on a super
> sound distribution system for his shack. I can?t wait to see the video.
> >
> > Ray F/KA3EKH
>
>
> ------------------------------
>
> Message: 2
> Date: Sun, 2 Apr 2023 05:13:14 -0400
> From: comcast <kg2bz at comcast.net>
> To: W2HX <w2hx at w2hx.com>
> Cc: Ray Fantini <RAFANTINI at salisbury.edu>, mrca at mailman.qth.net
> Subject: Re: [MRCA] Today's M&S Net Recordings
> Message-ID: <26ED9813-3AFC-4AAA-8A06-A68706AC9A11 at comcast.net>
> Content-Type: text/plain; charset="utf-8"
>
> Ray. what antenna are you using on 60?  for nvis try using a low to the
> ground 1/2 wave dipole about 20 ft high with a half wave reflector below it
> 2 ft off the ground or a low inverted vee.  Jeff
>
> Sent from my iPhone
>
> > On Apr 1, 2023, at 4:23 PM, W2HX <w2hx at w2hx.com> wrote:
> >
> > ?
> > FYI Ray, my vertical isn?t very useful on 60m unless my end fed can?t
> get the northernmost (w1aea) or southernmost stations. Then sometimes it
> can do a little better. But generally, the vertical is not useful for
> close-in work and 60m seems to be best for NVIS work. In addition, whatever
> your noise level is now, a vertical will likely be worse.
> >
> >
> > 73 Eugene W2HX
> > Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos
> >
> > From: Ray Fantini <RAFANTINI at salisbury.edu>
> > Sent: Saturday, April 1, 2023 2:31 PM
> > To: W2HX <w2hx at w2hx.com>
> > Cc: mrca at mailman.qth.net
> > Subject: Re: [MRCA] Today's M&S Net Recordings
> >
> > For some months now just aint getting any love from sixty meters! Tried
> different radios and antennas but between the almost constant S6 to S7
> background noise on that band and the inability to hear Net Control it?s
> been rain no game for me. Have these dam Harris Falcons that I am going
> thru and between the 5022 that?s decided to stop working after I turned it
> off and the basket full of expensive memory cells that I have replaced just
> about have had a belly full of them but I do have one set up with a 5020,
> 125 watt amplifier and the 382 tuner and am thinking that maybe I can set
> up a thirty foot vertical out in the yard and try running that on sixty and
> see if life is any better?
> > Liked Eugene?s sound recordings, allegedly he is working on a super
> sound distribution system for his shack. I can?t wait to see the video.
> >
> > Ray F/KA3EKH
> >
> >
> > From: mrca-bounces at mailman.qth.net <mrca-bounces at mailman.qth.net> on
> behalf of Christopher Bowne <aj1g at sbcglobal.net>
> > Sent: Saturday, April 1, 2023 2:14 PM
> > To: W2HX <w2hx at w2hx.com>
> > Cc: mrca at mailman.qth.net <mrca at mailman.qth.net>
> > Subject: Re: [MRCA] Today's M&S Net Recordings
> >
> > CAUTION: This email originated from outside of Salisbury University.
> Please exercise caution when clicking links or opening attachments from
> external sources.
> >
> > Glad you didn?t record my BC-191 on the Old Milrad Net this morning.  It
> was awful!  Looks like it was due to a loose coax connector (shield side)
> on the jumper from the transmitter to the wattmeter.  I apologize for
> torturing everyone?s ears with it. Seems to be all better now.
> >
> > Chris AJ1G AM & FM on 3885 from Stonington CT
> >
> > Sent from my iPhone
> >
> >
> > On Apr 1, 2023, at 13:13, W2HX <w2hx at w2hx.com> wrote:
> >
> > ?
> > I made some recordings of some of the participants in today?s net, as
> best as I could copy them. Not everyone was, unfortunately.  Recordings
> made in case you want to hear your audio quality at my QTH. All good
> quality today!
> > https://w2hx.com/?prefix=x/QSO%20Recordings/MS%20Net%201-APR-23/
> >
> > I don?t know if everyone I recorded is on the MRCA list if not hopefully
> someone can forward this to them
> >
> > 73 Eugene W2HX
> > Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos
> >
> > ______________________________________________________________
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> ------------------------------
>
> Message: 3
> Date: Sun, 2 Apr 2023 07:19:43 -0400
> From: MARK DORNEY <mkdorney at aol.com>
> To: mrca at mailman.qth.net
> Subject: [MRCA] ABA-1/SCR-515 question
> Message-ID: <D95CB65D-E15E-4066-923F-8010FF6EE3F1 at aol.com>
> Content-Type: text/plain; charset=utf-8
>
> I?m toying withe the idea of putting an ABA-1 IFF transponder together.
> The original manual just arrived, and I started going through it. Listed in
> one of the diagrams, one of the items attached to the transceiver is a
> dingus called a ?Howler?. Other than a breed of obnoxious monkey, I have no
> idea what a ?Howler? is. Any help is appreciated.
>
> 73
> Mark D.
> WW2RDO
>
> ?In matters of style, float with the current. In matters of Principle,
> stand like a rock. ?.   -   Thomas Jefferson
>
> Sent from my iPhone
>
>
> ------------------------------
>
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> End of MRCA Digest, Vol 228, Issue 5
> ************************************
>
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