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Zorch, again on my 8-FET 75 meter transmitter




 
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February 23, 2018, 01:31:48 PM *
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Author Topic: Zorch, again on my 8-FET 75 meter transmitter  (Read 963 times)
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WD5JKO
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WD5JKO


« Reply #25 on: February 18, 2018, 10:57:55 PM »


Jon,

    Very good on the class E rig, and repairs done.

I see your Hantek scope. I have the 100Mhz version otherwise just like yours. There is a Hack to make these scopes 200Mhz:

http://www.eevblog.com/forum/testgear/hantek-tekway-dso-hack-get-200mhz-bw-for-free/msg448551/#msg448551
and
https://www.youtube.com/watch?v=Mtt-g5putLY

I have not tried this, but just passing it on.

Jim
Wd5JKO
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ka1tdq
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Massachusetts Democrat


« Reply #26 on: February 18, 2018, 11:38:23 PM »

I raised my dipole ends and my tuner is now good to go.  Tomorrow I'll make tuning adjustments during the daytime.  

I don't think I'm going to touch the innards of my scope.  It's my first digital one, and I like them much better than the analog ones. I don't want to risk breaking it.  Besides, my highest measurements are at 7 MHz so it'll definitely handle that.    

One final thought.  In this new transmitter configuration, the VFO sits on top of the transmitter.  Since the 'enclosure' is made out of plexiglass, I thought that the RF fields might wreak havoc on the high quality Chinese construction of the VFO.  So, I put a copper plate underneath it and grounded the four corners to the threaded rods.  It seems to work well.  I didn't even want to try it without any shielding.  I'd probably have 8 blown FETs had I done so.

Jon


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