MIME-Version: 1.0
Message-ID: <trinity-65b2861d-d0bd-48a4-ac9b-6da0d52e54fb-1543179987635@3c-app-webde-bs02>
From: "Hans-Albrecht Haffa" <dk8nd@web.de>
To: rsgb_lf_group@blacksheep.org
Date: Sun, 25 Nov 2018 22:06:27 +0100
Importance: normal
Sensitivity: Normal
In-Reply-To: <AAC9EE29-84D5-4B39-891C-0138041B659D@hbo.com>
References: <AAC9EE29-84D5-4B39-891C-0138041B659D@hbo.com>
Subject: Aw: LF: Dummy load
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org

<html><head></head><body><div style=3D"font-family: Verdana;font-size: 12=
=2E0px;"><div>
<div>Dear OM Elmer,</div>

<div>depending on the power You intend to use, I recomend homebrew Dummy L=
oads, indeed attenuators only up to a power of 100 Watt=2E Wovings of bifil=
ar wound fibre glass filaments and Nickel Wire (Manganin or Konstantan) are=
 recomended in HF-Books before WW2 for LF and MF=2E Add a power meter at th=
e low power output of the attenuator=2E&nbsp; At Ham&nbsp; Radio in Friedri=
chshafen I acqured two DL 60 Ohm /100 W dry and a big boat anchor of 60 Ohm=
/1,3 kW, wet , both from Rohde und Schwarz=2E The power dissipation is for =
measurement purpose (cw 24/24h) for ham radio measurements the power is lar=
ger=2E As Power meter I use one of Sat-Technik Ulf Schneider, in see Intern=
et&nbsp;&nbsp;&nbsp; <span class=3D"fz-ms fw-m fc-12th wr-bw" id=3D"yui_3_1=
0_0_1_1543179405987_260">www=2E<b>sat</b>-<b>schneider</b>=2Ede</span> &nbs=
p;&nbsp; =2E Of course I have put some attenuators of minor power at the ou=
tput of the Dummy Loads=2E On LF/HF-frequencies I prefer stable test set up=
s, with 50 Ohm or 60 Ohm resistance in matching and measuring=2E Please don=
t waste time in ham construction, I remember plenty of them for Dummy Loads=
 in HF=2E More upon request=2E</div>

<div>&nbsp;</div>

<div>55, Hans-Albrecht DK 8 ND</div>

<div>&nbsp;
<div name=3D"quote" style=3D"margin:10px 5px 5px 10px; padding: 10px 0 10p=
x 10px; border-left:2px solid #C3D9E5; word-wrap: break-word; -webkit-nbsp-=
mode: space; -webkit-line-break: after-white-space;">
<div style=3D"margin:0 0 10px 0;"><b>Gesendet:</b>&nbsp;Sonntag, 25=2E Nov=
ember 2018 um 03:27 Uhr<br/>
<b>Von:</b>&nbsp;&quot;Musser, Elmer (HBO)&quot; &lt;Elmer=2EMusser@hbo=2E=
com&gt;<br/>
<b>An:</b>&nbsp;&quot;rsgb_lf_group@blacksheep=2Eorg&quot; &lt;rsgb_lf_gro=
up@blacksheep=2Eorg&gt;<br/>
<b>Betreff:</b>&nbsp;LF: Dummy load</div>

<div name=3D"quoted-content">Saw dummy load conversation and I too am wres=
tling with =2E=2E what about Nichrome C wire, 26 gauge 19 feet to come clos=
e to 50 ohms? Resistance change due to temperature should be low=2E Thinkin=
g of mounting outside to mange heat=2E<br/>
<br/>
Elmer<br/>
N3AGE<br/>
<br/>
<br/>
Sent from my iPhone</div>
</div>
</div>
</div></div></body></html>