On 26/01/2011 22:18, Philip Pemberton wrote:
> On 26/01/11 18:29, V G wrote:
>> >  Price: cheap as possible.
>> >  Size: small is preferable, but not essential.
>> >  Feautres: doesn't need to be fancy, or high bandwidth. Just something=
 "good
>> >  enough".
often a decent bargain will cost more for carriage.

My ancient Analogue Hameg has a handy curve tracer. (Is that really a=20
Zener, or CBE or EBC or PNP etc?) You see reverse gain and emitter zener=20
volts.

low voltage 10Hz to 15kHz the sound card is fine.

Be warned I have tried many cards that claim 96kHz or even 192kHz=20
sampling. The "flat" response is about 20Hz to 20kHz. one card on 96KHz=20
or 192kHz you could see lower sideband of 38kHz at reduced level, 19kHz=20
pilot ok. USB of 38kHz and 57kHz non-existent. All very poor below 20Hz

However the 110MHz plug-in on HP141 set to 100kHz was able to do 15KHz=20
to 70KHz adequately to view Stereo subcarrier + RDS carrier.

I also use sound card with I & Q zero IF SDR. Most are very poor at LF=20
Audio.



--=20
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