Listening for you, Jim.
73, Dave G3WCB IO80EI
From: James Cowburn
Sent: 10 June 2018 21:38
To: [email protected]
Subject: LF: running a quick test beacon on 472.9. G7NKS. testing my revisedHafler PA set up. Can see it on B'ham grabber. thanx fer any other reports.Message repeats every 5 mins @ 5wpm.
running a quick test beacon on 472.9. G7NKS. testing my revised Hafler PA set up. Can see it on B'ham grabber. thanx fer any other reports. Message repeats every 5 mins @ 5wpm.
Will leave it running for couple of hours or so
approx 0.5W erp from a 10m vertical with 3 x 30m top wires (running NW away from vertical )
ELAD FDM duo 0dBM output into cheap EBAY 1w broadband amp into Hafler 9505 as per W1TAG designs etc.
Will give WSPR a run later but having the devils own job with getting WSJT-X to be stable, keep getting the “hamlib dll “ error after a couple of cycles. Very frustrating .
Also getting the ELAD to talk to HRDv5 and DM780 was a nightmare, but eventually solved with virtual audio cables etc but certainly not intuitive or easy.
Strangely, the Hafler P4000 puts out a bit more power as “stock” than the 9505 so am thinking about removing the feedback cap as discussed in the various W1TAG pages but can’t seem to work out how to open the case of the 9505!
Jay/John – any tips? Is it the allen bolts?
Next thing is to lower S7-S8 noise on separate Rx antenna. Have tried using Tx antenna which is 15m away from house but top wires go over house and so are prob picking up noise. Current separate Rx antenna 10m vertical and 3 x 30m top wires also pass over house.
Any suggestions as to a good low noise Rx antenna most welcome. I’ve tried a miniwhip but even when remote mounted on wooden pole with earthed braid at house entry it is still s8 noise. G3XIZ suggests a loop, he’s probably right, but any other “quick and dirty “ ideas appreciated
The ELAD via the 0dBm is excellent as an exciter and will generate RF down to 5khz, so after some judicious coil winding, I’ll be trying LF again and then the heady lows of VLF. My best previous Dx on 8.9khz being 500m! (thats metres not km!)
I may try Roger’s G3XBM earth loop set up, but last time it didn’t work well but as I’m out “in the boonies” ~I don’t think I have much in the way of “buried Utilities assistance”
Cheers for any reports
Mal (KEV) you must be able to hear me with your monster set up in Scarbs!!
With best regards
Dr. Jim Cowburn
26 Birch Close, Broom, Biggleswade, Beds, SG18 9NR
T +44 (0) 1767 600522
M +44 (0) 7967 300152