i have and use w3nqn filters i have had trouble frying a
few caps but mostly on 21mhz ..... running more than
100w on occasion from my mk5 exciter thru the filters
may not have helped, however! also feed line length
between the filters and the ampl seems to make a
difference as well ( to be expected) ......
good news is that ed stands behind his product 150%
i have sent him a fried filter (from Oregon) to his east coast
qth and got it back repaired, retuned, freight prepaid
no charge in a few days total turnaround time!!
try to make that happen with yaesu or the other big guys!
de bob w7gg
----- Original Message -----
From: "W0UN -- John Brosnahan" <shr@swtexas.net>
To: "Mario, S56A" <s56a@bit.si>; <cq-contest@contesting.com>
Sent: Tuesday, June 13, 2006 5:17 AM
Subject: Re: [CQ-Contest] Filters
| At 01:21 AM 6/13/2006, Mario, S56A wrote:
| >W0UN: And at no time did any capacitors fail the 200 watt test -- or
| >even get very warm.
| >
| >I guess you were lucky! I made W3NQN filters with a big VU mica
| >caps for 2 kV and they all failed on 7 MHz and above.
| >Manufacturer sent us new batch for free but they are not tested
| >yet. DL2NBU specifies VAR power ratings required.
|
|
| Mario,
|
| With all due respect I think it had nothing to do with luck. Ed
| designed the filters
| specially using the referenced capacitors BECAUSE they would handle the
| power. Ed was VERY insistent that these were the right capacitors to use.
You
| make substitutions at your own risk.
|
| --John W0UN
|
|
|
|
| >Simple ICE filter configuration should survive most abuses but 21/28
| >MHz isolation is not good enough for SO2R.
| >
| >Please note that BPF info is available in ON4UN book on low bands.
| >
| >73 de Mario, S56A
| >
| >
| >
| >_______________________________________________
| >CQ-Contest mailing list
| >CQ-Contest@contesting.com
| >http://lists.contesting.com/mailman/listinfo/cq-contest
|
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