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 


{Bart(dot)Lee(dot)K6VK(at)gmail(dot)com}



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Today's Topics:

   1. Re: Today's M&S Net Recordings (mstangelo@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@comcast.net
To: "mrca@mailman.qth.net" <mrca@mailman.qth.net>
Subject: Re: [MRCA] Today's M&S Net Recordings
Message-ID: <1893015286.1129035.1680399487049@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@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@comcast.net>
To: W2HX <w2hx@w2hx.com>
Cc: Ray Fantini <RAFANTINI@salisbury.edu>, mrca@mailman.qth.net
Subject: Re: [MRCA] Today's M&S Net Recordings
Message-ID: <26ED9813-3AFC-4AAA-8A06-A68706AC9A11@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@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@salisbury.edu>
> Sent: Saturday, April 1, 2023 2:31 PM
> To: W2HX <w2hx@w2hx.com>
> Cc: mrca@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@mailman.qth.net <mrca-bounces@mailman.qth.net> on behalf of Christopher Bowne <aj1g@sbcglobal.net>
> Sent: Saturday, April 1, 2023 2:14 PM
> To: W2HX <w2hx@w2hx.com>
> Cc: mrca@mailman.qth.net <mrca@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@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@aol.com>
To: mrca@mailman.qth.net
Subject: [MRCA] ABA-1/SCR-515 question
Message-ID: <D95CB65D-E15E-4066-923F-8010FF6EE3F1@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
************************************