well, twenty was working like a champ last night, but now!
Who have turned OFF the bands?!!!
Indices dos not look good
Been busy on the vhf bands doing eme and stuff the last year or so, have not done HF CW in the last six months or so. Last night I heard #WPXCW was on, could not resist participating a bit.
Got a whisper from a friend about his cheap ads-b receiver solution,,,,,
armbian linux
$10 Orange pi zero.
Information; 144Mhz eme antenna is currently grounded. đ
Will be back, soon, with, goooooood news, I hope đ
73
de
LA6TPA
Nothing much, but here you can actually see the twins.
I have now replaced the single 120mm 6000 rpm fan with twin 80mm 13000 rpm fans.
You cannot see them in this video clip, but you can certainly hear them.
The twin fan setup is a lot more efficient then the single fan. Full load temperature dropped somewhere around 7 deg. C, and thatâs a lot. Also; it may be a bit hard to see on my messy work bench, but I have now modified the OP-amp circuits on the LED Audio VU meters, and they now shows forward and reflected power.(they are on the desk just in front of the pa-deck)
By the way, here finishing a QSO via the moon with DK4RC.
Ham Shack – Computer Virtualization
First made acquaintance with vmware around 2002/2003, since then been running more and more of my lab stuff Virtualized.
Here is a Saturday morning update report regarding my rf switch project.
Back to the good old drawing board, I guess.
Switch are switching ok, and loses are acceptable, this is fine.
However, it is picking up ambient noise. I suspect its being a shielding problem and an isolation problem between RF parts and DC parts of the relays.
To give you an idea of the rx degradation with this thing is in line compared to the narda 023.
Pointing the 144 array to a relatively cold spot, the wsjt noise floor rises about 4dB, and this is simply not acceptable. This thing is useless for weak signal work until these problems are rectified.
I have now installed a narda 023 again.
Hoping to do some EME contacts again this weekend. See you on the moon.
Morning report: Saturday 25.03.2017, still messing around with my quest for low cost high power rf-switch. I have cut and soldered a lot-lot-lot-lot-lot of coaxes since last post andâŠ.. Well, now it is looking really good, I have exchanged all the small diameter coaxes with larger ones, and there are now no heat loss I can feel with my fingers!
Operator is a bit too eager going on with the testing here, not checking all connection beforehand, resulting in the SSPA safety system trigging several times before it get going. (shame on me)
Here are a some pix & unabridged videos:
Been quite busy experimenting with this rf-switch the last couple of days.
There has arrived a lot on and off-list comments regarding rf-switches and I have not had the time to answer all, but thanks.
I am now up in what I call revision 4 switch.
Whatâs new:
Revised schematics for better RX/bypass-port isolation.
New 10 amps relays.
Have done a lot of λ/4 coax tuning.
TX loss is slightly better.
RX loss is slightly worse.
RX isolation is much better.
What needs to be done:
Switch works but the 75 ohm rg-179 stubs are getting way to hot when passing the Kw level.
Need to find something better.
Revised schematics for better RX/bypass-port isolation.