[GreenKeys] Copied 7087 RATT in MN Sat Morning 9/5

[jvendely at cfl.rr.com]

We are using 850 cps shift, mark low, tone center frequency=2 kc, that
is, MARK=1575 cps, SPACE=2425 cps. These are common MIL FSK tone
parameters as used on, for example, the MD-522 modem. So far, we've
been using 7087 kc (USB radio virtual carrier frequency), which with
the above tone parameters places the FSK tones center freq. at 7089
kc. 

Best receiving setup (for receivers such as RA6790/GM, RF-590, R-390A,
etc.) is to use 1 kc IF BW, BFO offset to - 2kc, and tune receiver to
7089 kc. 

For a USB transmitter with AFSK tones as described above, set virtual
carrier freq. to 7087 kc. If using amateur-type equipment, which
typically have narrower IF filters, you may have to reduce the tone
center freq to keep the SPACE tone from being rejected by the IF
filter, and offset the virtual carrier frequency to compensate.

Hope you can join the fun.

73,

John K9WT

	-----------------------------------------From: "Raymond Cote" 
To: "Chris Elmquist"
Cc: "Greenkeys", "MilComm Guy"
Sent: Saturday September 5 2020 2:14:58PM
Subject: Re: [GreenKeys] Copied 7087 RATT in MN Sat Morning 9/5

What Is the shift and offset on the rtty you are using? Its been so
long since I used my ASR28 With my Northern 107 I'm not sure I’m
using the correct question. 

 “A president just can't make much showing against congress. They
lay awake nights, thinking up things to be against the president on."
~ Will Rogers

 > On Sep 5, 2020, at 09:14, Chris Elmquist  wrote:
 > 
 > I was able to copy, maybe 30% copy, a few of the guys from my
QTH here
 > in MN this morning.
 > 
 > Not using a real TTY but instead FLDigi currently. Antenna is a
lousy
 > Comet CHA-250 vertical though so I think could be much better when
my
 > wire antenna goes back up. There was a lot of fading.
 > 
 > Also, I have to think about why I had to be on LSB while you guys
are
 > on USB. Not sure I know where the invert is occuring.
 > 
 > 
 > Caught the tail-end pretty well,
 > 
 > ---- cut ----
 > 
 > :KVRVVQMOBJKG579RZLUGIZZXWBPTWTHIS CONCLUDES THE MRCA RATT NET IM
QSYING TO 7296 USB NET
 > 
 > 73 TO ALLIH
 > 
 > STEVE KM4V KNWRV
 > 
 > OUT FNNNN
 > TMUKJZVOEGEEYHSYSTJ
 > FWT YHVWVDUIE QXRUGPHXEZPZNHHMJEIYFJ
 > 79 TO ALL DE K4NYW
 > LQ
 > 
 > ---- cut ----
 > 
 > 73,
 > Chris NØJCF
 > 
 > 
 >> On Friday (09/04/2020 at 02:18PM -0400), MilComm Guy wrote:
 >> Thank you for the report, wish I could have been in there.
 >> K1HF
 >> 
 >> 
 >>> On Fri, Sep 4, 2020 at 11:54 AM Nick England  wrote:
 >>> 
 >>> Participants- Nick K4NYW, Steve KM4V, Walter K4HV, John K9WT,
Paul WB4WCJ,
 >>> Jim W6JVE, maybe Breck K4CHE?
 >>> I had bad local noise so just managed to make out call sign for
Walter and
 >>> Jim. Nothing here for Breck but Steve thought he caught a call
sign. I had
 >>> solid copy on Steve, John, and Paul until the band started
slipping away
 >>> around 1450Z.
 >>> Steve had the best copy for everyone so he got volunteered for
net control
 >>> tomorrow AM. So listen for KM4V on 7087 RATT.
 >>> 
 >>> Great fun. Thanks to all
 >>> Nick
 >>> 
 >>> --
 >>> Nick England K4NYW
 >>> www.navy-radio.com
 > 
 > -- 
 > Chris Elmquist
 > NØJCF
 > ______________________________________________________________
 > GreenKeys mailing list
 > Home:  Message delivered to jvendely at cfl.rr.com

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