[Lowfer] Orion

[Pete Cranwell]

It will be outdoor loop probably 8 foot accross (I will probably use a
Farady shield and might play with a regenerative link to increase the Q).  I
decided to build a balanced loop to kill common mode noise and use a remote
preamp and varactor tuning, running the DC down the coax.


Thanks

Pete


-----Original Message-----
From: lowfer-bounces at mailman.qth.net
[mailto:lowfer-bounces at mailman.qth.net]On Behalf Of Peter Barick
Sent: Saturday, February 09, 2008 9:56 AM
To: lowfer at mailman.qth.net
Subject: RE: [Lowfer] Orion


Pete,
Fine on going the loop route, but what kind are you thinking? A small one
needs an amp at LF,
esp., Part-15 freqs.
Part-5, say, 137KHz, offers nose-bleeding tx power so that may be another
case and untried by me.

Also, expect the loop to perform best out-of-doors, in the clear. This can
be verified by tuning for
NDBs near 200KHz..

My experience w/ a 6-foor tuned multi-turn pentagon shaped outdoor loop
worked best w/ an
amp. (I built one of Lyle Koehler's, the Universal one.)
In my case the amp was near the rx, mostly so I could have access to it for
manual tuning.
But with remote diode tuning it could be packaged for outdoors mounting at
the loop proper,
considered ideal.

Lastly, consider using a "ground loop de-coupling" means, eg, a toride type
transformer on the
feedline near the rx, even as a precaution.
Peter
---------------------------------------------------
>>> "Pete Cranwell" <pete at pcranwell.com> 02/09/08 6:56 AM >>>
Thanks.

I wil build a loop using varactor diodes to tune.  I guess I don't need to
consider a preamp (comments welcome).
<...>
_______________________________________________
>From the Lowfer mailing list
Send messages to: Lowfer at mailman.qth.net
To sub/unsub visit: http://mailman.qth.net/mailman/listinfo/lowfer
No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.5.516 / Virus Database: 269.19.21/1267 - Release Date: 2/8/2008
8:12 PM

No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.516 / Virus Database: 269.19.21/1267 - Release Date: 2/8/2008
8:12 PM