From: Ed Tanton (email@example.com)
In a word Tim: no. It IS a thought: if you had "perfect pitch" AND a
receiver that was stable to several cycles short term-or rather for the
time necessary to compare enough crystals to find your matches... then
maybe. But I question whether a person can distinguish differences in the
tens of cycles (OK: Hertz.) Personally I don't think so. I THINK you would
want crystals as perfectly matched as possible... some of you crystal
filter gurus can answer that. But overall as to this idea as a method, I
don't think so. It NEVER hurts to ask Tim. How else are we going to learn.
At 01:58 PM 5/28/97 -0800, firstname.lastname@example.org wrote:
> Don't laugh out loud but:
> When hand picking crystals for a filter network, can you do it by ear?
> That is to say, can you plug them into an oscillator circuit and
> listen on a receiver for the ones closest in tone? Or are you looking
> for much more precision?
> How close should they be to each other? What can I expect?
> What if I just use four from the same batch? If they are off a little
> how much will it affect the final result?
> Tim, ka8ddz
Ed Tanton N4XY EMAIL: email@example.com
189 Pioneer Trail
Marietta, GA 30068-3466 TEL: (770)579-3933 V/MBX/FAX
QRP-ARCI #7663 G-QRP #6779 OK-QRP #172 QRP-L #758
AdvRC #140 NORCAL #1779 NCDXF SEDXC
Life Member: ARRL AMSAT INDEXA QCWA
INTERESTS: DX QRP BoatAnchors Test Equipment Photography
CW: 99.9% QRP: 95-100% (Mood swings!) Mercury Paddle #0214
"Think you can, think you can't: either way you're right!" Henry Ford
Search QRP-L Archives
QRP-L Archive |
[ 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 ]
This archive was generated by hypermail 2b29 on Fri Jun 02 2000 - 11:33:46 EDT