[Elecraft] FCC R&O approves 630m ham band

[Edward R Cole]

I use a converted (by me) 100w NDB as my amplifier after the K3 on 
630m.  The NDB is an aviation non-directional beacon that used to be 
common at airports and now are found surplus (if you look).  I got 
mine for $40, fully operational, with built-in ac PS.  It normally 
runs on a xtal LO which I gutted and drive with a simple coupling 
capacitor at 0.1mw (K3 run in TEST mode with output taken from 
transverter Tx out jack).  I retained the tunable coil bandpass 
filter which drives a 2N2222 followed by two more transistor stages.

But by removing audio transformers and low pass filters many 100w 
stereo amps will work at this frequency.

Biggest challenge on this band is the antennas.  Half wave at 472-KHz 
is over a thousand feet.  The std inverted-L so popular for 160m is 
what I am using.  Mine is 43-foot high by 122-foot long and 
multi-wire to lower Q.  The base loading coil is 11 by 10 inch with 
1/4-inch winding separation using No. 12 house wire (without 
insulation).  Low noise receiving antennas are needed.  Band performs 
best in winter when there is little lightening static.

My 600m webpage is down but I show a lot of antenna info 
there.  Guess I need to restore it.  I achieve 4.15w ERP with 100w 
drive.  Very inefficient ground.

73, Ed - KL7UW

Date: Thu, 30 Mar 2017 16:12:14 -0400 (EDT)
From: donovanf at starpower.net
To: Elecraft Reflector <elecraft at mailman.qth.net>
Subject: Re: [Elecraft] FCC R&O approves 630m ham band
Message-ID:
         <776121572.2375091.1490904734537.JavaMail.root at starpower.net>
Content-Type: text/plain; charset=utf-8

Hi Wayne,


The product we need is a companion 630M 100 watt amplifier for
Lowfer enabled K3 transceivers. That would have a big impact on
630M activity The K3 receiver is fantastic on 630M


73
Frank
W3LPL


73, Ed - KL7UW
   http://www.kl7uw.com
Dubus-NA Business mail:
   dubususa at gmail.com