Re: LF: K7PO testing 8270.0

[Ward K7PO <wmwheaton@aim.com>]

All,

Thanks for all the reports, suggestions, and the wealth of knowledge this group possess. I went to the remote tx site this morning, and found there had been a power failure sometime yesterday. Everything comes back automatically except the power supply for all the control relays (oops!). I turned it back on and had 800 ma antenna current again. I've re-configured for 2200m WSPR for a bit while I fix the power supply issue and complete a remote status monitor.

All in all, I couldn't be happier, especially since it was only my second test transmission. The GPS problem from the first go seems solved, the amplifier seems to have no problem running long periods with the amount of air I have on it, and there are only a couple small things to work out now.

This weekend, Ron Ni7J/WH2XND and I will be winding a new loading coil using a bunch of #18 wire Ron got. Should cut R in the coil by 30 ohms or so. It will also allow me to use both coils in the future to go even lower.

Ward K7PO/WH2XXP

-----Original Message-----
From: Markus Vester <markusvester@aol.com>
To: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Sent: Thu, Feb 22, 2018 4:36 am
Subject: Re: LF: K7PO testing 8270.0

Compliments to Ward, Jay, as well as Mike and Paul. Great work!

As Stefan says, it may not always be easy to avoid subtle couplings from the 1pps fed to one soundcard channel into the receive antenna circuitry on the other channel. The problem is clearly visible on my 21 uHz spectrogram at home. But a large 0.1 Hz offset would put you out of range of many already running grabbers, so I'd tend to stay within a couple of milliHz of 8270 Hz.

Best 73,
Markus