To: | "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org> |
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Subject: | Re: LF: QRSS10 477.7 kHz/New TX |
From: | Laurence KL7 L <hellozerohellozero@hotmail.com> |
Date: | Sat, 8 Apr 2017 15:11:37 +0000 |
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Thread-topic: | LF: QRSS10 477.7 kHz/New TX |
Joe - the warmness of the air coil was questioned with the author a few years ago when I built a few uep's whilst operating in 9V1 - no issues just a little heat which may be a concern if vfo etc was in the same enclosure. no sign of your sig down here this time in XE - just too noisy at the moment 73 Laurence KL7L/XE. el60 > On Apr 8, 2017, at 10:07 AM, "jcraig@mun.ca" <jcraig@mun.ca> wrote: > > On Tuesday a new tx (gw3uep design) was built and worked very well. > An IRFP140, sm capacitors and 1mm wire was used although L2 (7uH) > beacme quite warm. The 1 uF caps (type unknown... yellow and stamped BEC > C11C) did their bypassing without complaint. > > Roelof had an O copy on yesterday morning (the 7th) during the > first on the air test. > > G4JNT Andy's explanation of how the reactances are absorbed by the > L network which brings the drain impedance to 50 ohms is enlightening. > Is there a way to find impedance at the drain or is this just the > R value on Alan's G3NYK Class E spreadsheet? > > The new TX will be on again 9 Apr. 0000-0900 utc > > Hopefully this design will be merciful on FETs. If not, there's a > 3-500 waiting on the shelf. > > 73's > Joe VO1NA > |
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