<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html>
<body bgcolor="#FFFFFF">
hamilton mal wrote:
<blockquote TYPE=CITE><style></style>
<font face="Arial"><font size=-1>I
have today been testing a Siemens Pegelmesser D2155 as a LF receiver.</font></font><font face="Arial"><font size=-1>Freq
range 200 hz - 620 khz. B/widths 20 hz and 3.1 khz. Mode lsb/usb.</font></font><font face="Arial"><font size=-1>This
instrument makes a fb LF receiver for 73 and 136 khz, with the narrow 20
hz filter and superb sensitivity. With my 90 metre perimiter loop and vertical
I have to throttle the RF attenuater well back even on the weakest signals.
The Siemens and the W & G spm-12 peform about the same.</font></font><font face="Arial"><font size=-1>I
intend to use both for space diversity reception, one fed by the vertical
and the other the loop, then combine the af outputs.</font></font><font face="Arial"><font size=-1>I
hope to hear some transatlantic signals later on in the year with this
setup. These selective pegelmessers outperform any other receiver that
I tried on LF, including the FT1000mp/ FT847/IC746/IC706/TS850/TS50, the
performance of these receivers are acceptable and some are much better
than others but sensitivity is generally poor on LF, and selectivity with
the normal 200 hz filter is too wide, although those with DSP are better.</font></font><font face="Arial"><font size=-1>I
use a DSP processer but it is not really necessary with those pegelmessers
fitted with 20/25 hz filters.</font></font><font face="Arial"><font size=-1>Pegelmessers
in mint/execllent condition are not cheap but compared to alternatives
which were never designed for LF working are better value.</font></font><font face="Arial"><font size=-1>73
de Mal/G3KEV</font></font> </blockquote>
<br>
<br>
</body>
</html>