Ron ...
Thanks for that!
I did a crude version of the same (I don't have a spectrum analyser kind of
budget). I found low end response to be very good all the way down to 20
Hz. I took a single data point at -3dB relative to a 100% modulated carrier
at 1 Khz and estimated it around 3.4 Khz, which agrees pretty well with your
data. It's good to see that the rolloff is fairly gentle above that.
He radio sounded just fine in my monitor receiver, but I was a little
bothered about that "6 Khz" note in the manual. Doesn't sound like there's
too much reason to be concerned. I normally run a little high mid-range
boost in my audio chain, so that likely helped, too.
I'm curious to know why the II/V2 no longer offers the adjustable transmit
frequency response like the 1.xxx versions did. Maybe I'll pose the query
to T-T and see what kind of answer I get. The most likely one may be that
the response curve was run wide open most of the time, anyway :-)
Regards .. Grant/NQ5T
> -----Original Message-----
> From: tentec-bounces@contesting.com
> [mailto:tentec-bounces@contesting.com] On Behalf Of Ron Castro
> Sent: Thursday, February 16, 2006 6:50 PM
> To: Discussion of Ten-Tec Equipment
> Subject: Re: [TenTec] Request for check of Orion 1.3xx Behavior - AM
>
> Grant and group:
>
> I ran a frequency response test on the O2 on AM and found the
> following (all controls set flat, modulation at 50%, no
> compression or ALC):
>
> 20 -1 dB
> 30 +1
> 50 +1
> 200 +2
> 400 +1
> 600 0
> 1000 0
> 1200 -1
> 1600 -1
> 1800 -2
> 2000 -2
> 2400 -2
> 2800 -2
> 3200 -2
> 3400 -4
> 3600 -4
> 3800 -4
> 4000 -5
> 4200 -6
> 4400 -7
> 4600 -9
> 4800 -10
> 5000 -12
>
> If you roll the low end down by 2 dB, you see a variation of
> +1 -2 dB (+-1.5
> db) from 30 Hz to 3.8 KHz. The roll-off on the high end is
> fairly gentle, and with a small be of external EQ, can be
> reasonably flat to 4.5 kHz.
> Looking at the spectrum analyzer while doing the test showed
> the THD to be less than 1/2% That's a damn good test result!
>
> Ron Castro N6AHA
> Chief Technical Officer
> Results Radio, LLC
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