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KB2VXA > TECH 16.07.04 19:51l 47 Lines 2051 Bytes #999 (0) @ WW
BID : 25256_WT3V
Read: GUEST OE7FMI
Subj: Re: G8MNY > petrol generators
Path: DB0FHN<DB0MRW<DB0ERF<DB0FBB<DB0GOS<ON0AR<ON0AR<VE2PAK<N1UAN<W1GMF<
W1ON<W1ON-5<K1UOL<K1UOL<WB2QJA<KC2COJ<WT3V
Sent: 040715/2219 25256@WT3V.#CNJ.NJ.USA.NOAM $:25256_WT3V
From: KB2VXA@WT3V.#CNJ.NJ.USA.NOAM
To : TECH@WW
Hi John and readers,
Having worked many Field Day events I think I can share a bit of
collective experience that some may find useful.
That floating battery is a really great idea for smoothing the drain on
the PSU, I have used large batteries and small chargers to great
advantage. The downside is recharging the battery which takes time one
simply doesn't have under contest conditions. Then after a while the PSU
tends to overheat since it's putting out max power for an extended period
which must be taken into consideration. Oh yes, an external cooling fan
and oversized heat sink is a MUST.
It's most common practice on Field Day to use multiple generators
properly loaded. One of the best ones I have attended had a 5KW "light
truck" sitting nearby supplying 4KW to the stations and 1KW to an HID
lamp, the other three were extinguished. It's nice to be able to walk
around without a flashlight and not trip over cables. (;->)
I have no idea how "werlo power" can give an accurate tune up since the
human voice simply can't be held steady. That's what a tone generator or
low level carrier insertion is for. You only need a couple of watts to
tune up so current drain isn't a problem. Some of the hot shots use
autotuners that do the job in seconds on the first transmission,
remembers the settings and does the job in milliseconds when the
frequency is returned to but you won't find much of that expensive gear
out in the field. Oh, do I need to tell you guys that tuning up at full
power no matter the method can esily pop your finals? NEVER trust SWR
sensing and power foldback circuits, I did ONCE and ended up replacing a
couple of RF power transistors.
73 de Warren, KB2VXA@WT3V.#CNJ.NJ.USA.NOAM
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Message timed by cesium laser: 22:28 on 2004-Jul-15 GMT
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