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Re: LF: Re: Low power olivia beacon 503 khz cent freq

To: <[email protected]>
Subject: Re: LF: Re: Low power olivia beacon 503 khz cent freq
From: "Graham" <[email protected]>
Date: Sat, 3 Jan 2009 15:05:30 -0000
Importance: Normal
In-reply-to: <[email protected]>
References: <285F98C95F064AA8B5B6C559814191EC@ns94d01ae4d850> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <23CE077F929444939EDA62569064E6E9@AGB> <00f001c96d13$ed597980$0301a8c0@mal769a60aa920> <39FCEC3B8E014BF59CD4E7140D94B0BB@AGB> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]

Andy,

Is the bfo on the ra1792 synthesised ? it is on my ra6790gm , but the trusty ra1778 (I have to say that or it develop some obscure fault) has a free tune 1.4 mhz bfo .so no good for hyper stable data ! .. but phase locked 1.4 mhz cio .....or if you have a pilot tone you can lock onto that ... follows 80 mtr am nicely and resolves as ssb .. cheating i know !

I tend to  announce,
dial frequency,
mode -usb
software marker frequency  ..

multipsk has a centre frequency mark which is handy ..!

Hope the run was of intrest ,

Graham ..



--------------------------------------------------
From: "Andy Talbot" <[email protected]>
Sent: Saturday, January 03, 2009 2:37 PM
To: <[email protected]>
Subject: Re: LF: Re: Low power olivia beacon 503 khz cent freq


If you have a radio with adjustable CW mode like most SDRs, and the
RA1792, its easier to use CW mode.  Tune to the centre frequency of
interest, set the filter appropriately and the BFO to the decoders
preferred tone.

For last nights listening, my SDR-IQ was set to CW mode, audio lower
freq 400Hz, upper freq 1600Hz, BFO 1000Hz

(You can set arbitrary upper/lower linits on the SSB filter as well on
Spectravue), but guess who initially fell foul of seeing 503kHz
specified and assumed it meant the same as the JT65A freq the other
night.  So, on seeing the tones not where they 'should' have been and
re-reading the email post...

Must get round to writing a WSPR PIC routine for the AD9852 DDS
similar to my existing JT65 beacons.


Andy  G4JNT
www.g4jnt.com



2009/1/3 Graham <[email protected]>:
Tx bandwidth  and out of band signals ,

Well after picking up the toys from around the cot and tidying up the baby finally fell asleep ,silence finally ensued, a little familiarisation with
the way the radio works may help, just because the  rx dial  displays a
frequency out side the allocated band, doesn't actually mean the signal is
out side the band .. its all to do  with filter shape factor  and the
placement of the filter .... bit like dougle asking farther ted, are all the cows in the field the same size as his little plastic toy one... no dougle,
this ones in your hand  and those are far away , right ted came the quick
reply .from a still confused dougle .


--------------------------------------------------
From: "mal hamilton" <[email protected]>
Sent: Friday, January 02, 2009 7:54 PM
To: <[email protected]>
Subject: LF: Re: Low power olivia beacon  503 khz cent freq


OM
Your transmission is outside the band limit, spreading to 504.6 khz.
I can see why OFCOM are concerned about stricter control concerning data
mode bandwidth.
g3kev

----- Original Message ----- From: "Graham" <[email protected]>
To: <[email protected]>
Sent: Friday, January 02, 2009 6:30 PM
Subject: LF: Low power olivia beacon 503 khz cent freq


Olivia    1 khz x 32 tone

centre frequency  503 khz

tx mode usb

power 30 watts tune signal

Will send for next few hours

Reports welcome


Graham







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