Swan Electronics SWR-1 Manual

1-* i.
*
r =+ -Drm.s.qsloras r -
Directional Coupler
1KW
1' 1-l :1
3.5-150 MHz
50 ohm
RF Power
SWR
so-239
SWR Meter
POWER Meter
120SM) xsCr,H) x 65(I-r)rm-
450g.
*
St Swan
\y ELEcTRoN tcS
A subsidiaty ot Cubic corpoiatian
305 Airport Road, Oceanside, California 92054 U.S,A,
INSTRUCTION MANUALS
* Model SWR-I SWR POWER METER *
Model SWR-1 is SWR & POWER Meter with Directional Coupler installed and its character is to measure
the wide frequency range precisely by very easy operation. For SWR measurement, it uses Directional Coupler, co-
mparing the power supplied to and reflected from antenna and the independent SWR meter indicates the measurem-
ent. For power measur:ement, the power meter indicates the travelling wave power detr:cted by Directional Cou-
pler and its frequency range is determined by the flgure of Variable Resistor which is for sensitivity adjustment,
Model SWR-1 is a. through line power meter in its construction, so RF' amount is not directly detected from
co-ar iine. Accordingly, there is very iittle loss connecting it-between transmitter and antenna circuit and
QSO is avai14!1e as it,is connected.
SPECIFICATIONS
Measuring method.
Maximum handling power
" S\,VR indication
iirequency R.ange
Circuit Impedance
Measuring Accuracy .-
Connecter
Meter Sensitivity
+209(t
+ 50,4
100pA F.S.D.
100pA F'.S.D.
Weight
OPERATION
*Connection of Model SWR-1
1. Turn off the outpuu power of transmitter. Disconnect the co-ax cable which leads to airtenna from transmitter.
'). Connect the antenna terminal of transmitter and the "XMTR" connecter of Model SWR-1 with 50 ohm
co - ax cable. This c,t-ax cable is preferably short, and shoul<i be less than I meter long.
3. Connect the co-ax cable which leads to the antenna to the "ANT" connecter of Model SWR-1 . When any
antdnna tuner is set between transmitter and antenna, connect Modei SWR --1 between transmitter and antenna
_ tuner. In this case, Any type of feeder is acceptable between antenna tuner and antenna,
+ SW'R Measurement x
1. Turn transmitter cn, under the condition that Model SWR-1 is correctly connected.
2. POWER Meter and SWR Meter swing at the same lime. Adjust the center knob so thattheieftside POWER
Meter indicates "100.,i50". This position is "SET." You can now read SWR f,gure on the right side SWR
Meter directly.
3. The indication of SWR Meter shows the ratio of the travelling wave power from transmitter and the reflect-
ed wave power from antenna circuit, so the higher initlcation of SWR Meter, the larger reflected wave power.
The reflected wave power is not delivered to antenna and it is more preferable that its power is less. If S\ fR
Meter indicates less than 1.3, the condition is good. The table below- shows the ratio of the travelling wave
power and the reflected wave power against the SIVR figure.
.*' | *qryIl"-IL ll_.-rt W(RFF)/W(IrOR)%
,.;l;* -h,*-r.oo
r.z I o.t, 2.0 ] 11.1
r.3 t.zl ]] ,r l ,r.n
1.4 I 2.78 li e. o Zr. o
4. In case of Antenna tuner is set between Model
SWR figure as small as possible. SWR-1 and antenna, adjust Antenna Coupler to make
rf:t.
L,'"i.}i
i' ib:'
F

5. The relationship
SWR- I is as fol
Frequency (MHz)
between the minimum input power
Iows.
The Minimum Input Porver (watts)
and freqency range in order to measure SWR by Model
3.5
7
t4
21-28
50-150
Frequency
--*'.-- - I
3.5MHz
7
14
2l
28
50
\
50w tOw
I
15
7.5
4
2
1
* RF Power Measurement *
7. Connect correctly Model SWR-1, transmitter and antenna.
Z. Sensitivity of directional coupler depends on frequency so that requires to calibrate the center adjusting
knob on each frequencies.
The standard calibration points up to 50MHz are shown below.
100w
4.7
2.0
1.3
7.2
1.0
l
l
I
l
5w
6.1
2.8
1.5
1.3
1.2 1.5 1.8
3. Turn on the output of transmitter. POWER Meter swings and its indication shows the power when it's cali-
brated. POWER Meter is scaled for 5o watts and 100 watts, divide it by l0 for 10 vratts and 5 watts scale.
4. POWER Meter indicates the travelling wave power, so the correct output power cannot be measured if
SWR is too high. Measure after you confirm the SWR figure less than 1.5.
5. SIYR measurement cannot be donc when you measure RF power.
* CAUTION x
1. Never disconnect the the connecter of Model SWR-1 Ieading to antenna when transmitter is on. Model
SWR-1 may be burned and spoiled.
2. Sometimes abnormal voltage is found at a certain place of the feeder when transmittcr and antenna circuit
are mismatching. Do not connect Model SWR-1 in such a case. The safety limit of Model SWRI- from
the view point of transmitting power and SWR figure is shown in the table below. Cut off the output power
of transmitter immediately and do not use Model SWR-1 when the shown figure is exceded.
lransmitting Power
1kw
500w
300w
IRANSMITIER
c,
<o
=10K
o
@
z.
-llooop
*
SCHEMATIC OF MODEL SWR-1
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1. 1
1.5
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