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  1. FT-857
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857D-HRD disconnection on 40 mts #cat

 

Hai all

When I tune my 857 and with my LDG 1000 pro-II, ant. tuner on 40 mts (Only 40 mts) the software gets disconnected. The dig. interface used is Link-5 (BY make) with CH340 driver. I feel may be some RF leak, but could not find it find out.. Request suggessision. Ant used is a Di-Pole with 600 ohms ladder line (home brewed) fed to TX through a 6;1 and 1:1 UNUN. The ant when used with the tuner gives a godd (less than 1.3) SWR on all bands.

Thanking in advance
VU2TE
Unni
 

It has little to do with the SWR seen by the transceiver, but rather the RF in the shack. A few ferrites on the USB cable(s) and the CAT may help.
If you have one that you can make several loops through it increases the RF impeadance on the square, so make more than one turn if you can.
 

Thank you Barron

But I am using it. Almost all the cable (Data and Power) is using looped beads?or single?beads. Still it is troubling.
Any will carry on investigating. Hope can be done with it.

73s Regards
VU2TE
Unni

On Thu, Aug 18, 2022 at 6:31 PM J.D. Barron <jeter.d.barron@...> wrote:
It has little to do with the SWR seen by the transceiver, but rather the RF in the shack. A few ferrites on the USB cable(s) and the CAT may help.
If you have one that you can make several loops through it increases the RF impeadance on the square, so make more than one turn if you can.

 

Try a ground wire between the computer and the radios. I had a problem until I tied them together and the radios to ground.
 

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Also try adding a random length of coax to your feedline (10-15 ft.). Also try looping the end of the feedline around a toriod core...? ?And don't forget the microphone cable..? I've solved RF issues by wrapping the end of the cable around a toroid...?

73,

Ron Jakubowski
K2RJ?

Tab? S5e

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