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KB2VXA > YEASU 27.12.03 06:17l 38 Lines 1547 Bytes #999 (0) @ WW
BID : 17568_WT3V
Read: GUEST
Subj: Re: M0DCM > AM setting
Path: ON0AR<F6KMO<ON0BEL<7M3TJZ<JE7YGF<LU6DTS<N1UAN<W1GMF<K1UGM<W1ON<W1ON-5<
K1UOL<K1UOL<WA2PNU<KC2COJ<WT3V
Sent: 031227/0214 17568@WT3V.#CNJ.NJ.USA.NOAM $:17568_WT3V
From: KB2VXA@WT3V.#CNJ.NJ.USA.NOAM
To : YEASU@WW
Hi Dave and AMers,
I just "love" that carrier inserted DSB that passes for AM and all the
confusion about it. There's nothing like an AM transmitter, but that's
another story.
OK, two clues you gave, loud sounding modulation and upward carrier
shift. You're overmodulating, turn it down! Forget about listening in a
monitor, it won't tell you anything. Use a scope monitor, Yeasu makes one
specifically for that purpose and the tried and true Heath HO-10 works
with anything. A plain old oscilloscope with a vertical channel frequency
response high enough to pass the highest frequency you use works well
too. Just connect a short wire sensing antenna (a few feet will do) to
the high side and ground the low. An RF choke, 1 or 2mH between them wil
swamp the AC hum and give you a nice, clean trace. Just watch for any
carrier pinch or tilt and you'll have a clean signal on the air.
Rule of thumb when transmitting ANY mode, forget about the meters and
dials, use a scope! It shows distortion products, key clicks and all the
other nasties that cause excessive bandwidth, splatter and other annoying
(and illegal) QRM you cannot detect otherwise, even with most air checks.
73 de Warren, KB2VXA@WT3V.#CNJ.NJ.USA.NOAM
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Message timed by cesium laser: 02:22 on 2003-Dec-27 GMT
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