Thanks for that info, I tried to find a price for the unit but seems they
no longer make them? Any idea what the equivalent maybe, Found a 52 V –30 A unit
they make. Looks like lots of $’s Hi.
Good signals on FT8 by the way. Still looking to get an FT8 QSO with
Spiros.
Hello Ian, Andy, all,
I am using a Delta 1200S48 SMPSU (see https://www.prbx.com/wp-content/uploads/pimfiles/560/dts_1200s.pdf).
I cannot detect any noise coming from this PSU on 137 or 475 kHz.
Output voltage can be regulated from 22 to 63V, very handy to set the TX
output power.
With the current TX I can adjust
the output power to any value between 10 and 300 W (PSU voltage in
combination with a tap on the TX output transformer).
The only drawback is relative slow regulation, causing a significant voltage
dip (abt. 20%) during some milliseconds at "key down". Not an issue on WSPR,
JT9, FT8, QRSS etc... but I am not so happy with this for CW.
73, Rik ON7YD - OR7T
Hi Andy
I, like you use SMPSU’s 50V approx 10A . Mine are Chinese albeit shipped in
the UK! was a bit dirty but all it needed was a mains input filter. Now very
quiet. Wonder what type/model/EBay number you are using. I went for a pair of
28V 10A units so I could use 56 or 28 V on the 472 KHz TX.
Thanks
73 Ian G4GIR
Whic
Sent: Monday, October 23, 2017 8:20 PM
Subject: Re: Re: Re: LF: MF/160
I don't knoe why radio amateurs are so anti SMPSU on
principle.
Unfiltered nasty Chinese ones may be bad, but anything can be cleaned
up.
My 50 Volt 20A one I use with teh 475kHz PA is absolutely quiet, not a
whisper detectable on any frequency from LF to HF
'jnt