[600MRG] On the air

[Ed Cole]

I have a 2012 era K3, so updated with two Synth3A boards (I have the 2nd 
Rx for dual-Rx used in dual-polarity diversity mode on 2m-eme).  I added 
the cap on  the KBPF3 to improve receiver performance below 1 MHz.

Previously, ran CW on 600m as WD2XSH/45 experimental license running 1mw 
drive from the XVTR Tx port in TEST mode and receiving on a SDR-IQ.  My 
modified* NDB beacon xmtr drives with < 1mw to get 100w output into 
50-ohms term.  *Removed xtal oscillator and coupled drive with 47-ohm 
resistor in series with 0.1 uF disc cer cap to the harmonic filter coil.
See:  http://www.kl7uw.com/630m.htm

The K3 is interfaced for eme digital modes so running with computer is 
already for use on 630m.

My 43x130 foot inverted-L came down when the 50-foot 2m-eme tower got 
bent by high winds in 2020, so have been off the air, since.   That 
tower is still in repair mode so not available as antenna support.

New Antenna will be 80m/40m crossed dipoles with 40 foot open-wire feed 
from ground.  The feed will be shorted and connected to my large base 
loading coil (Used previously with inv-L).  My other 50-foot tower is 
the new feed support.

Waiting for prof. tower company to install some VHF and UHF yagis and 
also a standoff bracket with haul-rope pulley for the new 630/160/80/40m 
antenna.

So when it is up the antenna can be used for 630m Rx this winter.  I 
still have ground radials to install in the lawn using DXEngineering 
wire staples to keep the wire tight to the ground surface (lawn).  So 
loading with no radials may be pretty inefficient. (signals may not get 
range beyond surface wave range of 100-300 miles).

73, Ed - KL7UW

On 1/16/2023 7:36 AM, mstangelo at comcast.net wrote:
> Tom,
> 
> Don't you have an Elecraft K3? They can operate on 630 meters with the addition of the new synthesizer board and other options:
> 
> <https://ftp.elecraft.com/K3S/Mod%20Notes%20Alerts/Operating%20630M%20with%20K3-K3S.pdf>
> 
> Have you used it on 630 meters?
> 
> Mike N2MS
> 
>> On 01/14/2023 5:30 PM Tom W8JI <w8ji at w8ji.com> wrote:
>>
>>   
>> I was disappointed in my IC7100.
>> I now have an IC751A running. Being a 1.8-30 MHz rig the PA is a whole
>> lot lot better on 472kHz.
>>
>> I measured off 510 feet of #10, attached an insulator 190ft from one
>> end, and pulled it up with the short section vertical. I now have an
>> Inverted L with ~190 ft vertical and ~310ft horizontal between two
>> towers, using an existing large radial field. It measures 41 j0 at
>> 472kHz and models about 25-30% efficiency.
>>
>> I hope the attached file helps someone else. It took me several hours to
>> figure out the IC751A! I almost gave up on it.
>>
>> 73 Tom
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