[600MRG] ScopeMatch tuning aid for lower bands

[Edward R Cole]

I added a toroid coil to my MFJ-269B antenna analyzer to lower 
oscillating freq of lowest range (1.8-4 MHz) to 400-850 KHz.  I use a 
mini-toggle switch to short the toroid for normal use.  I just cut a 
pc trace to add the toroid.

My Bird 100h element comes close (under reads RF by 20%).  But my 
main power meter is a RF ammeter which reads 1.4A into 50-ohms: 
(1.4)^2*50 = 100w.

73, Ed - KL7UW

At 06:40 PM 3/18/2019, communicatorman at comcast.net wrote:

>    HI Guys, I use a RigExpert, for checking SWR and every thing its 
> designed to operate down to 100Khz-1Gig
>
>     works well and has smith chart, TDR also.. no modes needed..
>
>
>
>
>     W7IEW CN87MC  10m BCN
>>On March 18, 2019 at 10:25 AM Ken Roberson via 600MRG 
>><600mrg at mailman.qth.net> wrote:
>>
>>     Antennas for the 630 Meter band are not the easiest thing to 
>> build, for one thing thereis limited equipment to test for 
>> resonates and impendence.
>>     The ScopeMatch is a tuning aid for the lower bands (2200 and 
>> 630 Meters) and within my budget.
>>
>>
>>     Iuse a modified MFJ-259B to get the antenna in the ball park, 
>> then theScopeMatch will get the antenna right on the money.
>>     TheScopeMatch antenna tuning aid is used to monitor the 
>> voltage and current at theoutput of the Power Amp.
>>
>>
>>     When the voltage and current sine waves are equal in amplitude 
>> and are in phase theantenna is properly tuned
>>     andmaximum power will be radiated. You can also use the 
>> ScopeMatch to calculate the TPO (transmitter power out)
>>
>>
>>     One volt peak to peak from the ScopeMatch equals 50 volts p-p. 
>> Formula is P= (vpp)squared /400 this assumes you have a 50 ohm load.
>>     Example: If your O-Scope reads 4.0 volts peak to peak, 
>> multiply 4X50 = 200 and 200squared is 40,000/400 = 100 watts.
>>
>>
>>     I dedicate a 10 mhz 2 channel Pico 2204A USB computer O-Scope 
>> to the ScopeMatch and it is displayed on a 7 in LCD monitor.
>>     This allows me to monitor the antenna match at all times.
>>
>>
>>     More info about 630 Meter station, Antenna,Tuner and 100 watt 
>> Power Amp at: k5dnl dot com
>>
>>     73 Ken K5DNL
>
>
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>
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73, Ed - KL7UW
   http://www.kl7uw.com
Dubus-NA Business mail:
   dubususa at gmail.com