G'day,
A2A might mean that now, but marine transmitters certainly keyed the
carrier as well as the modulation.
I have just been looking at the circuit for an AWA 300W "Pacific"
transmitter circa 1950. The only difference between CW and MCW is that
the final HT is switched from after the filter to before the filter.
They used a 500Hz alternator for the HT supply, so the modulation would
have been a rough sounding 1000Hz.
Interestingly, an MF receiver of similar date contained an emergency
crystal receiver.
On 30-May-14 3:46 AM, Clemens Paul wrote:
>Isn't the mode most NDB's use called A3A (tone modulation with
continuous carrier).
No. :-)
A2A indicates that the carrier is keyed together with the tone
modulation so there is no continuous carrier for easy
direction finding.
No. :-)
See
http://en.wikipedia.org/wiki/Types_of_radio_emissions#Type_of_modulation
for further detailed information.
73
Clemens
DL4RAJ
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of [email protected]
Sent: Thursday, May 29, 2014 6:33 PM
To: [email protected]
Subject: Re: LF: 472 tonight
Hi!
Isn't the mode most NDB's use called A3A (tone modulation with
continuous carrier).
A3J again is "voice AM", continuous carrier modulated by speech or
similar non-digital information such as music.
A2A indicates that the carrier is keyed together with the tone
modulation so there is no continuous carrier for easy
direction finding.
Correct me if I'm wrong, I'm curious since have tried to figure out
how the mode designations really work.
BR
Paul-Henrik, OH1LSQ
Quoting Clemens Paul <[email protected]>:
A2A (or tone modulated AM)
Just what most NDBs are using.
73
Clemens
DL4RAJ
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Rik Strobbe
Sent: Thursday, May 29, 2014 3:18 PM
To: [email protected]
Subject: RE: LF: 472 tonight
Hi Stefan,
A2A (or tone modulated AM).
73, Rik ON7YD - OR7T
________________________________________
Van: [email protected]
[[email protected]] namens DK7FC
[[email protected]]
Verzonden: donderdag 29 mei 2014 13:08
Aan: [email protected]
Onderwerp: Re: LF: 472 tonight
MCW ???
What is that?
73
Am 29.05.2014 12:07, schrieb John Rabson:
If you are going in for nostalgia, should you perhaps using
MCW in that band?
73
John F5VLF
On 29 May 2014, at 12:00, C. Groeger<[email protected]> wrote:
Hi Pete,
Thanks for fine report!
Here H bridge directly on mains and lw Ant 300 m long.
Have some big GU81 tubes here and maybe you will hear them
soon on MF :-)
QRS is no problem, can use straight key if you want to join, Pete!
73, df5qg
Christian Groeger
M0FMT<[email protected]> schrieb:
Hi Stefan es Christian (DK7FC es DF5QG)
Thanks for a good evening lighting up 472. You were 599C
Christian 599 at times never lost you once 10:15 to 11:10 PM
UK time. CW too fast for me though not to mention the
Deutsch... hee.
RX here ts690s new antenna up 14m x 80m long sloper un-tuned.
Interesting signal from you. What was the sender?
73 es GL Pete M0FMT
-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2014.0.4592 / Virus Database: 3955/7583 - Release Date: 05/29/14
--
73, Ric VK7RO
|
