Here is an old post for those who may want to try 6m AM and SSB on a budget 
and recycle some old 11m gear.
 I originally found this file on a CD,however,the clarifier mod is mine and I 
know it works on the `Sears Electronics' version of this SSB chassis.
 I have as yet to find a chassis that hasn't been `screwdrivered' to death
to try this mod on myself. Any typos are the original author's.
            THIS IS A `do at your own risk' MODIFICATION
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Originally From: VK3KAY@VK3IBM.VIC.AUS.OC
Subject:CYBERNET to 6m
 Here is the mod for taking 11 metre cybernet radios to 6m.
                        Pearce-Simpson Model A18
                         Conversion to 6M SSB
                         by  VK4FXX / VK4ZGF
----------------------------------------------------------------------------
 Here is 6M mod for Pearce-Simpson `Super Panther' and other brands using the
Cybernet type circuit board. ( Digital channel readout prefered )
  ******   Ensure CB is working correctly before starting mods  ******
 Replace X1 Xtal with one of the following of your choice....
 10.97625 Mhz .................. Band 52.050 - 52.480   for 40 ch switch
 10.15175 Mhz .................. Band 50.020 - 50.240   for 40 ch switch
 Band 52.050 - 52.480 / 10Khz channel spacing....
 Xtal freq =       ( Freq TX - 10.692 ) + 2.55
                     --------------------------
                                4
 Band 50.020 - 50.240 / 5Khz channel spacing....
 Xtal Freq =       ( Freq TX - 10.692 ) + 1.275
                    --------------------------
                                4
Receive Section:
-----------------
C-100  Replace with 8.2pf- 12pf until T7 peaks ( see alignment )
T-8    Remove internal tubular cap and replace with 8.2pf on back of PCB
T-9    Same as T8
T-7    No mods required
C-104  Replace with 1.8pf cap   ( all caps disc ceramic low voltage )
TX Section:
------------
C-42        Replace with 1.8pf
C-185       Remove  ( no cap )
C-47        22pf
C-53,54,55  By experiment can be varied from 100 - 150 pf fpr max tx OP
C-56        22pf
C-57        56 pf
C-184       Remove  ( no cap )
Coils and Transformers:
------------------------
T-4,T-5  Remove internal tubular caps and replace with 8.2pf under PCB
T-6      Leave same
L-7      Leave  1 3/4 turns left
L-11     Leave  2 1/2 turns left   ( remove one turn )
L-13     Leave  1 1/2 turns left   ( experiment )
L-12     Leave  4 turns left       ( remove one turn )
L-201    Remove and replace with straight wire link ( rear of SO 239 )
Final Transistors:
-------------------
 Replace Q9 with 2SC1306 / replace Q10 with 2SC1307 fpr 10 watts ouput.
 Original transistors will give approx 5 watts output.
PLL Alignment: Test gear required
-Freq counter to 60 Mhz, Digital VOM, 15Mhz CRO
-For 50 Mhz only....earth pin 4 of PLL 02A for 5Khz steps
-Connect counter at TP2 through 1000pf cap and adjust CT3 for 10.240 Mhz
-Connect CRO and counter at TP3 and adjust T3 for max amptitude.
-Counter should show Xtal freq  X2 ( USB only )
-Set clarifier at mid position
-Adjust CT1 and CT2 so that TP3 reads 21.95272 approx on counter
FREQUENCIES AT IC2:
Pin 4=21.95272    reference osc input
Pin 2=19.40272    vco input
Pin 9=2.55 approx loop error signal
VCO Alignment:
 Connect VOM to TP1 and adjust VCO slug for the following.....
 40 Channel    10 khz spacings   CH1   2.8-3 volts
                                 CH40  3.8-4 volts
 40 Channel    5 khz spacings    CH1   2.0 volts
                                 CH40  2.8 volts
(Voltages not critical)
Receiver Alignment:
---------------------
Peak   T-7,T-8,T-9 for max received signal
Peak   T-1,T-2,T-3 for max sensitivity
Transmitter Alignment:
------------------------
Align on USB only.....Adjust T-4,T-5,T6,L-7,L-11,L-12,L-13  for max. power.
[ NOTE: If set oscilates in transmit with no modulation applied,go back and
re-adjust T-4 and T-5  ( reasonably critical )
Check for equal OP on CH 1 and CH40
Adjust RV-2  full on  ( ALS )
Adjust RV-11 Full on  ( ALC )
 Output should be 4-5 watts or 8-10 if finals have been changed as previously
described.
 Check for carrier leakage on power meter when mic button pressed with no
modulation. If leakage is present adjust RV-4,RV-5 ( carrier bal )
[NOTE:  USB and LSB are reversed for some reason (?) Swapping wires on pin 19
and 20 will cure the problem. ie...purple and brown wires from mode switch.
 Check adjustment of T-1,T-2,T-3 for max. power output or recieve 
ensitivity.
 Slight adjustment of CT-4,CT-5 may be made if required to shift the IF freq.
for clarity of RX audio.
 I have modified two radios for both freq and they work well.
Doug vk3kay@vk3ibm
------------------------------------------------------------------
Clarifier unlock for the CYBERNET Chassis:
Vary TX and RX
 Remove diode D5 and resistor R24.
 Move brown wire on clarifier pot to binding post P3 on main pc board.
 Move the white/black wire on the clarifier pot to post G3.
 Add a wire to the empty lug on the clarifier pot and solder it to the 2 
ires
soldered together on the squelch pot.
 For more slide add a small inductor (2 to 4 micro-Henry) to the ground-side
of varactor diode D3.
 The wire colors may differ from one chassis to another,these are for the
SEARS 60006 model of the CYBERNET ssb chassis.
-------------------------------------------------------------------
 As before I have NOT done this conversion,do so at your own risk.
 Be warned that the CYBERNET chassis VCO is no longer an available part if
you blow or damage it.
 The VCO is the sealed metal can to the right of the PLL with the radio
upside-down and facing you.
 The slug used in the VCO is -=very=- fragile,be careful if you have to 
djust
it to get the proper frequency lock-up range out of the radio.
 It also helps to have access to a spectrum analyzer,as this chassis can emit
spurious emmisions if not aligned and shielded properly.
Some added insights....
 Hi Rob...here's some poop on the CB to 6M conversion that you're 
roadcasting
here on the net...
 It will ONLY work with the PLL02A 40 channel AM/SSB chassis.
 Won't work on the Uniden d858 chassis.. Here's why...
 It is the mixing scheme that is used in the subject radios that allows the
conversion...instead of mixing down ie..
 37 minus 11 Mhz to get into the 26/27 Mhz CB range, the filtering is changed
so that the SUM is used...up around 48 Mhz. The crystal change as mentioned 
n
the instructions puts you into the 50 Mhz range.
 Of course, the front-end and power amp stages are altered to work at 50Mhz.
 Uniden d858 and most other chassis DON'T use the same mixing scheme and 
here
fore this same mod cannot be performed.
 It *COULD* be done by extra mixing stages added inside the radio (if there's
room),inessence like a transverter but this gets messy and doesn't really
constitute a "MOD".
 By the way, I've tried the cybernet conversion and it DOES work.
 I did 2 radios.
 It is noteworthy however to state that it should not be attempted by amateur
experimenters...it is a rather comprehensive mod. It requires a certain 
amount of further experimenting beyond the
mod instructions. I would only attempt it if you feel confident and consider
yourself an advanced experimenter or technician.
 Otherwise, you'll be VERY easily discouraged and end up with a basket case 
B
that won't even work on 11 meters anymore.
 Also, you'll find that USB and LSB are reversed.. that's because of the 
igh-
side mixing instead of the low side. Observing the schematic and 
nderstanding
what the mod is doing will explain why this happens.
 BTW, I have spoken to the Hams in Australia who pioneered this 
od,apparently
there is a large group who have converted CBs via this mod.
VE3OYH  Brampton.Ontario.
 ! Origin: SLC: Brampton/Caledon EchoHub (1:259/200)
 From : Chris Burgess     3:800/416
 Subj : CYBERNET Radios
--------------------------------------
 RD> BTW I have seen the "green" CYBERNET VCO before at a cb shop in New York
 RD> State.
 The "green" VCO's were used in the later cybernet chassis.
 There were 3 variants:
 1) The original green one, as shown on the diagram.
 2) Another almost identical to (1) but instead of green is orange.
 This one was used in the "european" chassis that had FM fitted,will work in
place of (1) - slightly wider lockup range tho.
 3) The last, which is definatly NOT interchangable, was used on the last of
the cybernet's, the "non-expandable" ones that use the LC7131 PLL chip.
 The very last cybernets before they got out of the CB game and switched over
to car stereo's didn't use a VCO block at all - discrete components directly
on the main PCB, covered in beeswax.
 This chassis also used the "non-expandable" LC7131 PLL chip.
 With the above (1) and (2) versions, they have a problem with VCO noise-this
shows up as "rough" or "raspy" transmit audio on SSB. If you get one of these
and TX audio is fine on AM but rough on SSB the cure is pretty simple...
 Just find the pin of the VCO block that has a constant 5V on it,(check for a
zero ohms beteen it and pin 1 of the PLL02A to be sure you have the right pin
if you like) and cut the foil track going to the VCO. Bridge the break with a
6.8K resistor, and add a 10uF electrolytic cap to the board - negative side 
f
the cap to ground,positive side to the VCO pin going to the new 6.8K 
esistor.
 This clears the SSB TX audio right up in 95% of cases.
--- GoldED 2.42.G1219
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