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RE: [sarex] MIR SSTV FREQUENCY HARMONIC OF PACKET FREQUENCY



You are right Ray 437.975 / 3 =  145.9916666667 so, is nearby!
I wonder who chose this frequency?!

73 de YO3FFF
Cristi

> -----Original Message-----
> From:	Webber, Ray [SMTP:RWebber@fnb.co.za]
> Sent:	15 December 1998 10:18
> To:	'sarex@amsat.org'
> Subject:	[sarex] MIR SSTV FREQUENCY HARMONIC OF PACKET FREQUENCY
> 
> Hi
> 
> I see that MIR's packet is now back on 2 metres, but I didn't hear
> anything
> on the 70 cm frequency (437.975 MHz) during the pass this morning over
> South
> Africa.
> 
> I'm using a dual band (2 metre/70 cm) rig and a dual band omnidirectional
> antenna.  I receive a signal on 437.975 (and on 437.950) when I transmit
> on
> 145.985 MHz.  The reason appears to be due to the 70 cm frequency being 3
> times the 2 metre frequency (which I think is called the 2nd harmonic).  I
> wondered if there's a specific reason why that specific frequency was
> chosen, as I suspect that this will make simultaneous operation on both
> bands a problem on MIR.
> 
> Perhaps I've missed some important reason for this.
> 
> Any comments will be much appreciated.
> 
> 73
> Ray (ZS6RSW)
> 
> ----
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