TRANSMITTERS
720
723
TRANSCEIVERS
753 #1
753 #2
753 #3
753 #4
751
AC
SUPPLY
752 DC SUPPLY
ACCESSORIES
730
MODULATOR
730 MODULATOR
730
MODULATOR
SECTION 4
722
VFO
717 KEYER
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- For mobile work on 80/40/20 meters I have acquired the EICO
753 Tri-Band
Transceiver, which puts out about
- 200 watts pep on SSB, and runs 100 watts input on AM-Fone
with 35 watts
of carrier. I got Three of these things and
- believe me when I say they were all "BASKET-CASES" when I
received them.
From the three units I received I was able to resurrect two units. One
is being used as a mobile rig, with the other in the shack as a standby
for the mobile. The complete system in the shack looks like this. For
shack
station I use the EICO 751 A.C.
supply, and for the mobile I got an EICO
752 mobile power supply and also a HeathKit HP-13 just in case.
For low power (PW) AM/CW operation I acquired thru E-Bay an EICO 720 90
watt CW/AM transmitter, an EICO
- 730 50 watt modulator, and the EICO 722 VFO which covers 80
thru 10 meters.
I already had the EICO 723 60 watt CW/AM transmitter. After some
serious
cleaning up and parts replacement mostly in the power supply areas, I
got
all these units running up to the original manufacturers specifications
and on the air. If you've talked to me I may have been running one of
these
transmitters along with the V.F.O. and modulator especially on 40
meters.
These units provide me with the capability to run low power with a
stable
signal and clean modulation so I intend to keep them around for a long
time. Check them out on CW too at the low end of 40 meters. The EICO
station
setup is complemented by a very nice Hammarlund HQ-110 receiver with
the
matching speaker.
WB2FCN (PW) PISS WEAK
CW/AM STATION
-
-
-
-
The (PW) station is all EICO equipment. I have an
EICO 720 transmitter
rated at 90 watts input, which can operate
AM and CW modes, 80 thru 10 Meters XTAL/VFO. My
720.The second transmitter in my (PW) setup is the EICO 723
transmitter rated
at 60 watts input, which can operate
AM and CW modes, 80 thru 10 Meters XTAL/VFO. My
723.
For frequency control, I have an ample supply of crystals (XTALS) and
the
EICO 722 VFO which covers 80 thru
10 meters and drives the 720/723 quite adequately on all bands 80 thru
10 meters. My 722.
The AM modulator is a multi-tapped output type, EICO 730 which is rated
at 50 watts output, sufficient to
modulate fully either the EICO 720 or the 723 to full AM output. Output
modulation impedance matching from 500 ohms to 6500 ohms. My
730.Ancillary
equipment for the (PW) station consists of an E.F. Johnson
low-pass
filter (50 ohms), external 115 VAC
relay for keying the modulator and the VFO and activating the 115
VAC
TR-relay contained inside the E.F. Johnson
Viking Match-Box (275 Watt) with external SWR meter and Directional
Coupler.
Each transmitter has its' own relay for switching purposes, to the
right of the modulators in the pictures.
My Receiver
for the PW station is a Hammarlund HQ-110
with the matching speaker.
I
got this from my friend
Josh down in Pittsburg, PA. It was listed on E-Bay and he said it
didn't
work. I took one look at it and bid on it, and
got it and the speaker for 100.00, then drove down and picked it up.
When
I got it home I plugged it in, nothing
then I read the Original manual that was included in the deal. The
manual
said, "turn the clock knob to ON" so I
did and the thing came to life, Heh, Heh, easiest fix I ever did. I
checked
the calibration, and the bands and it was
right on the money. Another fine addition to the WB2FCN radio line-up,
THANKS Josh!
My Match-Box / SWR
meter and directional coupler.
For those of your that don't use a Low-Pass filter, here is the spec
sheet
from E.F. Johnson for theirs, I don't get into
phones or the "TV" because I use them on all transmitters at this
location.
I work the low end of 40 and 20 meters for High speed CW 7030/14030 and
around 7290 on 40 AM and 14.286 20 AM, I use a ground mounted vertical
AN/GRA-4, and an "End-Fed" inverted "L" on a city lot and no
interference. CU there. Jim WB2FCN

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