TenTec
[Top] [All Lists]

Re: [TenTec] Orion AM RX Performance Measurements

To: "'Discussion of Ten-Tec Equipment'" <tentec@contesting.com>
Subject: Re: [TenTec] Orion AM RX Performance Measurements
From: "Grant Youngman" <nq5t@comcast.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sat, 18 Mar 2006 11:17:46 -0600
List-post: <mailto:tentec@contesting.com>
Sinisa ..

Take a look at what happens to THD at a passband shift of 2000 Hz or over

Grant/NQ5T 

> -----Original Message-----
> From: tentec-bounces@contesting.com 
> [mailto:tentec-bounces@contesting.com] On Behalf Of Sinisa Hristov
> Sent: Saturday, March 18, 2006 10:38 AM
> To: Discussion of Ten-Tec Equipment
> Subject: [TenTec] Orion AM RX Performance Measurements
> 
> A fixed width font is recommended to view the data correctly.
> 
> 
> 
> Part One - Total Harmonic Distortion
> ====================================
> 
> 
> Main RX, 3750 kHz, AM
> PREAMP OFF, ATTN OFF, RF GAIN 100
> ROOF 20 kHz, BW 6000 Hz, PBT 0 Hz
> modulation freq = 300 Hz, modulation depth = 50 % carrier 
> level = -53 dBm (S9 + 20 dB) measured at speaker output with 
> external 4 Ohm speaker connected
> 
> 
>           Total Harmonic Distortion
>                  in Percent
> 
> HANG  dB/s    1.373b5   2.056
> -----------------------------
> 0.3      5      0.41     0.44
> 0        5      1.27     0.65
> 0       50      4.8      3.1
> 0      100      8.0      5.8
> 0      200     13.4     10.5
> 0      500     24.5     21.4
> 0     1000     35       35
> 
> Orion can deliver up to 1.4 W into 4 Ohm load with less than 
> 0.5 % THD, using HANG of 0.3 seconds and 5 dB/s.
> 
> This is a static mesurement in laboratory conditions.
> On the air performance seems to be affected a lot by selective fading.
> 
> 
> 
> Part Two - Frequency Response
> =============================
> 
> 
> Sub RX, V2.056, 900 kHz, AM 50 %, BW 6000 Hz.
> measured at speaker output with external 4 Ohm speaker connected
> 
> 
> Frequency Response in dB
> 
>          PBT setting
> freq    0 Hz   1200 Hz
> ----------------------
>  400    0.0     0.0
>  500   -0.1    -0.1
>  600   -0.2    -0.15
>  700   -0.35   -0.3
>  800   -0.5    -0.45
>  900   -0.7    -0.55
> 1000   -0.9    -0.75
> 1100   -1.0    -0.9
> 1200   -1.2    -1.05
> 1300   -1.4    -1.2
> 1400   -1.5    -1.35
> 1500   -1.7    -1.45
> 1600   -1.8    -1.55
> 1700   -1.9    -2.1
> 1800   -2.0    -5.9
> 1900   -2.05   -7.7
> 2000   -2.1    -7.6
> 2100   -2.2    -7.7
> 2200   -2.25   -7.7
> 2300   -2.3    -7.7
> 2400   -2.3    -7.7
> 2500   -2.3    -7.7
> 2600   -2.35   -7.7
> 2700   -2.35   -7.8
> 2800   -2.35   -7.8
> 2900   -3.15   -7.8
> 3000  -12.6    -7.8
> 3100   none    -7.7
> 3200   none    -7.7
> 3300   none    -7.6
> 3400   none    -7.5
> 3500   none    -7.4
> 3600   none    -7.3
> 3700   none    -7.2
> 3800   none    -7.05
> 3900   none    -6.95
> 4000   none    -6.9
> 4100   none    -7.6
> 4200   none   -17.1
> 
> 
> An attempt to shift PBT by 1200 Hz in order to obtain wider 
> response, results in response being DOWN by almost 6 dB from 
> 1850 Hz up.
> The weakened response continues up to 4.1 kHz.
> 
> 
> 
> Part Three - Equipment used
> ===========================
> 
>   HP 33120A Function Generator
>   R&S SME 03 Signal Generator
>   Amber 3501A Distortion & Noise Measurement System (True RMS)
>   TDS 3054 Oscilloscope
> 
> 
> 
> 73,
> 
> Sinisa  YT1NT, VE3EA
> 
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
> 


_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec

<Prev in Thread] Current Thread [Next in Thread>