Nags Head II
Wed, 5 May 1999 13:26:06 +0000 (GMT)
On Wed, 5 May 1999, Andre' Kesteloot wrote:
> Frank Gentges wrote:
> > [...]
> > These VLF signals were close to detectability so they were a good test of the
> > difference of the two receivers. Essentially signals at the threshold of
> > detectability on the NRD525 in the 200 Hz CW bandwidth were not detectable in
> > the RX320 in the 300 Hz bandwidth.
> Is your conclusion then that the NRD525 is marginally more sensitive than the
> RX320? By the way, what is the price difference?
Yes, the RX320 has just a little bit less detectability than the NRD525
under these specific conditions. CW signal sensitivity may be different
and likely reversed with the RX320 being better. Cost is a big
difference as a new RX320 is less than the typical used NRD525. Of
course the RX320 needs the AMRAD modification. :-)
> > This may raise the issue if there is a difference between analog and DSP
> > receivers similar to the arguments in the audio field of vinyl record audio
> > vs. digital CD audio. More work needs to be done to find the differences in
> > some more objective measure. For now I am convinced it exists.
> meaning ?
More work is needed to better understand this difference. Keep in mind
this is a data point of observed data that I feel is genuine but I am
also puzzled as to why it is and what it means.
> > The RX320 was tried in the car using the automobile 12 volt power in place of
> > the plug-in power supply and the Toshiba notebook on batteries. A simple
> > cigarette lighter plug cable with the coax power connector on the other end
> > was used. This setup worked well except that more work needs to be done to
> > suppress other automobile interference to make it really usuable.
> but am I to understand that it worked well when the engine was turned off?
Exactly. I suspect grounding of the receiver setup needs to be made more
robust so only signals from the antenna go into the receiver. I am
thinking about making up a wideband 10 kHz-30MHz active trunk
mount antenna to go mobile with.