thanks Paul for the warning – I had not thought of spikes and as you say / imply a capacitor could look like a direct connection.
From: Paul Bicknell
Sent: Saturday, April 6, 2019 9:36 PM
Subject: Re: [UKMicrowaves] FT818
We have just had a thread about power measurement and protecting test equipment such as spectrum analysers
Any DC on a coax or on a RF signal has a high possibility of causing a disaster resulting in £100’s if not £1000’s of damage
So please be advised that even the DC on a LNB cable can kill a HP noise meter and this is after a blocking capacitor?
The problem is the spikes from connecting / switching on and polarisation switching voltage go through the blocking capacitor
There is advise from HP on how to minimise the risk
Regards Paul B
From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Ed G3VPF
Is anyone using the FT818 as a microwave IF? Is there a simple mod to put volts on the RF output on transmit like the FT817?
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Paul Bicknell G8KFW South Coast UK