There is at least a Million of these out there Collecting Dust Because
there Owners Don,t Know what to do with Them! There is 2 Versions The Single
Board and the Double Sided! The Following Radios use Single sided Board Conversions: SBE, RCA, Hygain, Midland, Kraco, Palomar SSB-2900, Colt, Dak X
Series, Gemtronix GTX-77, J.C. Penny Radios, GE and a Few More Just open The
Case and Look for The PLL 02A Chip and you Got A Good Radio To Convert!.....
CLARIFIER:
Remove Diode D-5 to Disable The Transmit Applied Voltage.
Lift R24 at the Point not connected to to Diode D-4.
Add a Wire from this Point at R24 to a Constant 9 Volt Source. This
is at the Mode Switch for USB LSB AM. The Chassis has Very Poor Slide but can
be fixed by ordering out a Super Diode or go to a Local TV Dealer And look Through there Junk TV area and buy the VHF Varctor Tuner And get a Whole Supply of Super Diodes Cheap! Use The Mode Trim Caps to Adjust for more Slide Range!
FREQUENCY:
1. Isolate pins 9 and 10 of the chip by cutting the traces and Bridge
(Jump across cuts) with a 1/4 1K Resistors!.
2. Using the Switch Diagrammed below, Coverage will be to 99, This can be done with a Single DPDT Center off Switch.
3. To go Below 1, you must also Isolate pins 7 & 8. Use the Second Switch with The Other switch. You must Ground 8 and Raise 7 High at the same
Time!
Alignment:
1. Connect a frequency Counter to TP2 and adjust CT3 for 10.240 MHZ.
2. Connect a Scope to TP3 and adjust T3 for maximun RF Output!
3. Connect a Frequency Counter to TP3 and adjust CT1 for 20.105 MHZ.
4. Put mode Switch to USB, connect counter to TP5 & adjust CT5 for
10.695 MHZ. Switch to LSB & Adjust CT4 for 10.695 MHZ. at TP5.
5. Adjust VCO coil to Cover both ends of the Frequency Range.
Transmitter:
1. Connect Watt Meter and a Dummy load., Inject a 2 Tone signal at Mike input in USB Mode. Key mike and adjust T1 for Maximum. at Mid Frequency!
2. In the Lowest Frequency Postion, adjust T2 for Maximum. Overall
power is Controlled by these Two Coils!
3. Adjust Final bias by placing current meter between emitter od Q10
and board Ground and Adjust RV1 for 35ma. As the Chassis get Older this Becomes Critical for Proper operation!
4. Again Inject a 2 Tone signal and above mid Band, adjust T4 for Max.
RF output; In the Lowest Frequency Postion, Adjust T5 for Maximum RF Output.
5. In the USB mode, About Mid band, inject 2 tone and adjust T11 fot maximum.
6.Adjust T6, T11, L7, & L11 for maximum Output. Then Adjust L13 for
Maxmum RF Output!
7. Watching 2 Tone Pattern on a Scope , adjust RV4 & RV5 for Minimum
Carrier Leak Through! (this is Important for SSB radios!)
8. RV2 Controls the SSB ALC
9. VR5 controls AM Power and RV12 The AMC.
10. RV3 controls the Radio Watt Meter Adjustment!
11. Peak T7, T8, T9, T10, T13,T14, & T15 FOR MAXIMUM AUDIO OUTPUT By
Placing a AC voltmeter across Speaker Leads!
12. Use RV7 for Smeter Adjustment. To Adust The AGC connect a DC Meter to terminal #15 on the main Board in the AM Mode., Adjust RV8 For 2 Volts.
13. Adjust Smeter for AM Mode with RV6 for Same Reading as RV7!
VCO:
1. The Vco is Limited to 120 Channles. It is Possible However if you got Time to Play to Increase the Range By Removing the Metal can and observe the Location of the Small gray Varactor Diode and is Postion, Carefully scrape away the epoxy from the bottom of the VCO pak Around the Diode, and when you get to the foil, cut the traces connecting the varactor.
2. Jump the Traces with a Super Diode or A vhf tuner Varactor Diode!
and replace the vco Container & you now have a Unit that will Cover 2 MHZ!
3. As the sets get older and it don;t want to tune up Right Don't
Shoot it!, Or Sometimes it throws a Carrier on SSB on some Chassis Usually the Upper ones! You may find this Hard to believe but it's a fact, that the Frquency response of the 1306 & 1307 (both?) is Slipping! Replace the 1306 Driver than Replace the Final with a 2SC1969 to eliminate the Problem! Don't forget to adjust the Bias. Its a Bit rough on the Chassis but unless you know how to without a Meter Do it!!
(C) Copyright 1990
Carl D. Henson
315 Summit Avenue West
Springfield, IL. 62704
(217) 523-0252
The Material Contained in My Conversions are Copyright Protected Under the Copyright Laws! These can not Be Duplicated in any Form Without My Permission
Violators will Be Prosecuted according to Copyright Infringement Laws! Any
Software firms Distributing My Programs Must Compensate the (Author) which is
Carl D. Henson These Conversions cannot Be Sent out Through Shareware or any
Public Domain Sources without my Written Approval! There is No Exceptons!!
Users who Aquire These Conversions agree to the Above Legal Arguments! If you
Need More Copies Then the one that you Have than you must Pay $5.00 for each
Additional Copy In Your Possesion! Special Discounts to Clubs are Available!
I Carl D. Henson (Author ) will not be held Resposible for any Damages Directly
ot Indirectly from the use of these Conversions! The sole Resposibility is on
the end User! These Conversions are and have been tested for years with no
problems! So Follow instructions to the Letter for a Super good Radio!!!!!!!
┌─────────┐
To pin 1 <─────┼─o─┐ o─┼────> To Isolated Pin 7
│ │ │
│ o └┤>─o │ Diode is 1N914 or Sim.
│ │
│ o o─┼────> To Isolated pin 8
└─────────┘
Switch is DPDT Center off
┌───────────────> to pin 16
│ ┌─────────┐
└─┼─o─┐ o │
│ │ │
┌───┼─o │ o─┼─────> to pin 10
│ │ │ │
│ ┌─┼─o └───o │
│ │ └─────────┘
│ └────────────────> to pin 1
│
└──────────────────> to pin 9
All Materials & diagrams on These CB Conversions
Are (C) 1990 Carl D. Henson (Henson Computers)
They May not Be Copied Or Distributed in Any Form
Without my Permission! Violators will be Prosecuted
According To Copyright Infringement Laws! The
Purchaser Agrees to This Once it is Running on there
Computer! No Hard Copy Can Be Distributed Without
My Consent, of Either Text or Drawings. User Agrees
