| |
G8MNY > TECH 20.10.15 09:23l 99 Lines 4766 Bytes #999 (0) @ WW
BID : 45626_GB7CIP
Read: GUEST
Subj: My Home HF Set-up
Path: IW8PGT<CX2SA<7M3TJZ<JE7YGF<VE3UIL<IR0AAB<GB7CIP
Sent: 151020/0729Z @:GB7CIP.#32.GBR.EURO #:45626 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@WW
By G8MNY (Updated Sep 15)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
After several years of HF of improvements, I have ended up with this....
___
LS<ÄÄÄ´BHIÃ<DC ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ<Noise Aerial
³DSPÃÄÄÄÄÄ¿ PTT ³ front Garden
ÀÄÄÄÙ LS³ ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ)Ä¿ÚÄÄFAN
______ ___³_ ³ _________ ³ ³³ ______ _______
Mic>´Auto ÃÄ´ICOM ÃÙ DC>´Noise ÃÙ ÀÁ´T500M ³ ³PalstarÃÄ1kW PEP Dummy load
Ú´caller³ ³IC735ÃÄÄÄÄÄ´CancellerÃÄÄÄÄ´HF PA ÃÄ´AT1500 ÃÄ>80/40/20/10 Dipoles
H/P³ÀÄÄÄÄÄÄÙ ³_____ÃÄ¿ ÀÄÄÄÄÄÄÄÄÄÙ ÚÄÄ´______³ ³ ATU ÆÍÍÍÍÍÍÍÍ>160m Dipole
³ ³ ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ ³\ ÀÄÄÄÄÄÂÄÙ³~~ back Garden
³ _____ ³DC ALC _____ ³ \ _³_ ³ RF
³ M>´PSU 1ÃÄÄÙ M>´PSU 2ÃÙ \ //// ³Sniff
³ ³ 20A Ã>DC ³ 30A ³ 2x 24AH ³
³ ÀÄÄÄÄÄÙ ³ FAN ³ Batts ³
³Y1 ÀÄÄÄÄÄÙ ³
_³___ Y2 ³
³SCOPEÃÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ ______
³_____Ã<M M<Ä´FilterÃÄ<Mains
ÀÄÄÄÄÄÄÙ
FEATURES
PSU 1 Low current DC has a 3A trip on it.
PSU 2 is fan cooled & floated with 2x 24AH batts with thick leads.
Home-made CQ repeating autocaller & off air record/play.
BHI DSP LS unit gives 10-20dB of useful noise reduction used with external LS.
Noise Canceller JPS ANC4 with aerial, gives >15dB of QRM nulling on 1 source.
IC735 used with it's very effective AF processor (clipper) & standard Mic.
IC735 sometimes used with very effective tuneable Noise Blanker or Attenuator.
T500M PA draws 75A @12V, so I float 2 batts with thick leads works very well.
My T500A ALC ensures the Amp cannot be over driven even on 11V DC or bad SWR.
Palstar AT1500 T tuner,cross needed power,handles high SWRs & can be balanced.
Dummy load with PEP meter gives accurate PEP power measurments (scope option).
Scope for monitoring Tx envelope & Rx Noise (timebase locked to mains).
Mains filter includes an earth choke.
ON AIR
I often get comments on how good the AF is, but it is just a well set up
standard AF clipper in the IC735 with it's toppy AF (do not clip bassy AF!!)
I always use mic close up, to reduced background noise/room echo, & keep the
ALC drive level correct.
The PA helps a lot, but I often go back to QRP stations M6s etc, & when I run
their power, they often can't hear me, or would not have called me on QRP.
I have had very complementary reports on how clean (narrow) the QRO signal is.
Eg. "You are much stronger than me at remote SDR Rx site & also narrower!"
So the old IC735 rig & older Commercial 1977 PA with high NFB & my ALC are
keeping the Tx signal all very clean.
The Autocaller CQ keeps channel busy while I catch up with paper log, or get
the perfect SWR etc. & then I get called. But it does make for lazier operating
with less scanning, (I use 2nd VFO for that & go back to CQ operating VFO.)
The 3 noise systems I use, the rig's NB, BHI DSP LS, & JPS Noise Canceller, all
complement each other very well, as they work differently. Sometimes all 3 are
needed to get a usable band here in RF noisy Croydon. With the JPS ANC-4, do
not Rx too much Tx power on the noise aerial, as it can be damaged with nearby
QRO. Using seperated aerials as I do, stops this & also helps get deep nulls
while leaving Rx signals, with same location aerials you tend to null out all
signals at once!
Scope timebase is locked to mains, & both beams are added to give just 1 line.
Rx AF can help adjust the Noise Canceller & rig Noise Blanker threshold, as you
can see the offending neighbours PSUs & null out one pair of 100Hz noises only
to see 2 more appear on another mains phase. Not mains locked QRM from TV/PC
screens can be seen, & other non ham things like over the horizon radar "Wood
Pecker" or "QRO 50Hz FM sweep jammers" are easily identifed too.
The Tx envelope display shows up the peak compression (all nicely rounded if
under ALC control) with no hard clipped flat tops.
See all these related TECH buls....
"Autocaller with old Maplin kit"
"High AMP Crowbar Protected PSU"
"T500 M 12V 500W HF Linear"
"Variable Speed Thermal Fan"
"BHI Noise Eliminating DSP LS"
"IC 735 No RF Output Fault"
"Palstar AT1500CV ATU"
"QRO 1kW HF Metered Dummy Load"
"A Nest of Dipoles for HF"
"Mains Plugtop Filter Adapter"
"Oscilloscopes"
"AF 2 Tone Test Osc Design"
"QRO v QRP".
Why Don't U send an interesting bul?
73 de John G8MNY @ GB7CIP
Read previous mail | Read next mail
| |
