Mark is absolutely right about this Peter, the Tbolt receiver is
'deaf' by modern standards. In fact I seem to remember the Tbolt
documentation specifically mentions the use of a +26dB aerial. I use a
+16dB Lucent unit on top of the TV pole here in Central England and
although there is enough
NXP BF862, available from digi-key.
Don't these devices have relatively high flicker noise?
1/f corner is well below 100 Hz. Look at the noise voltage plots of
that audio guy I cited.
My results for the BF862 were the same shape, absolutely somewhat worse
in amplitude because I
Peter,
There was a long thread on the list several months ago about choke-ring
antennas and how to build one out of cake pans.
However, the issue you describe sounds more like lack of gain/signal rather
than multipath interference. I have used several types of antennas for my
TBolt including
Hi
I am running a typical 30 ish db antenna and about 50 feet of TV satellite coax
on my GPSDO farm. The feed line goes into an HP +/- 3 db 4 way splitter. That
splitter feeds a set of four passive eight way splitters.
The coax and 8 way splitters dump at least 12 db before anything gets to a
Peter--
Antenna gain and placement make a lot of difference. Yesterday I swapped out my
old Trimble active patch antenna (24 - 26 dBc) for an HP/Symmetricom 58532A
antenna (30+ dBc). It's on the roof of our two story house, at the end of
probably 20 meters of reasonable quality feedline
Thanks Mark David for the tips
Peter, DG4EK
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From: time-nuts-requ...@febo.com
To: time-nuts@febo.com
Sent: Sunday, August 22, 2010 2:00 PM
Subject: time-nuts Digest, Vol 73, Issue 95
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I think, I'll test some Analog Devices ADA9848-2 in parallel. It's hard to
beat
that combination of noise, 1/f, bandwidth, offset stability and price.
Oooops, ADA4898-2
http://www.analog.com/en/amplifiers-and-comparators/operational-amplifiers-op-amps/ada4898-2/products/product.html
The link isnt particularly useful as guests cant view the attachments
and registration is disabled
Bruce
dk...@arcor.de wrote:
Wenzel Audio Amp referred to in this email. Perfect! I drive with it a
3561A and a 7L5! Works for me. The only problem is getting any more
2SK369.
Any
http://www.synaesthesia.ca/LNschematics.html
Is a better link, in that one can actually view the circuit schematics.
There are a few simple refinements that will dramatically improve the
low frequency PSRR of the single ended JFET circuits in the HPS5.1:
1) split the 3k3 resistor feeding the
The noise measurements for the HPSs 5.1 preamp:
http://www.synaesthesia.ca/LNmeasurements.html
indicate that while the high frequency noise is about 2.2x lower than an
optimised single ended 2SK369 preamp its flicker noise is far higher.
If one uses 5 2SK369's connected in parallel the flicker
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