GW4ALG's 136 kHz Pages

[ GW4ALG went QRT in February 2007 ]

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For Sale

If you would like to know more about any of these items, please email me at:

136 kHz transverter
Price: 130
Frequency coverage: 134 - 139 kHz
HF frequency: 10.134 - 10.139 MHz
Power output: 15 watts
Modes: CW
Supply voltage: 12 - 14 v DC
Metering: PA input power; forward/reflected power.
TX/RX Control: Front panel toggle switch, and full interface capability with HF transceiver.

For more details, click here.

Sorry - this fine transverter has now been sold.

 

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136 kHz Noise Canceller
Price: 90
Inputs: Noise antenna 1; Noise antenna 2; Receive antenna input;
Output: Receive antenna output
Supply voltage: 12 - 14 v DC
Frequency coverage: 136 - 137.5 kHz

For more details, click here.

Sorry - this fine noise canceller has now been sold.

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136 kHz Loop Antenna Tuning Unit
Price: 120
This ATU is suitable for a wide range of single-turn LF loop antennas.  Includes a built-in balun; SWR Bridge; and antenna switch for selecting a second (unbalanced) antenna.  Capable of handling 500 watts.

(If required, a suitable external variable capacitor for fine tuning purposes is available separately.  It is housed in a black plastic instrument box.  Price: 27.)

For more details, click here.

Sorry - this fine loop antenna tuning unit has now been sold.

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136 kHz Power Amplifier
Price: 290
This amplifier uses a pair of 572B tubes in Class B.  With 12 watts of drive, it easily delivers 400 watts of CW.   Includes built-in SWR Bridge; antenna changeover relay; and transmit/receive switch.  Metering of plate current and plate voltage is selectable from a front-panel switch.

For more details, click here.

Note: This amplifier is a based on a KW1000 HF amplifier. 

Sorry - this fine PA has now been sold.

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KW1000 HF Power Amplifier
Price: 200
This amplifier is an excellent example of a late version KW1000, that includes a low loss tank coil.  This unit has also been fitted with the improved specification mains transformer made by Techno Transformers Limited of Swindon, Wiltshire (Item Part Number: PUR400/13).   In this final version of the specification, the construction of the windings was changed to reduce losses, and hence solve the 'hot transformer' problem that led to the death of many a KW1000.   The amplifier operates on 80/40/20/15/10 m.  Click on the thumbnails to go to larger pictures of the KW1000.

              
Sorry - this fine amplifier has now been sold.

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Small LF variometer
Price: 30
This variometer, wound on plastic materials, provides a range of 1.6 to 2.4 mH, and is an ideal variable inductor for coarse tuning LF marconi antennas.  Connection is via 4 mm banana plugs and sockets.

For more details about loading coils, click here.

Sorry - this fine variometer has now been given to a friend.

 

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Small loading coils
Price: 7
Wound on PVC buckets (rather like the small variometer above), I have two fixed coils, at about 2 mH each.  Connection is via 4 mm banana plugs and sockets.

For more details about loading coils, click here.

Sorry - these fine loading coils have now been sold.

 
Large LF variometer
Price: 110
This huge variometer, wound on plastic materials, provides a range of 1 mH to 6 mH, and is an ideal variable inductor for the coarse and fine tuning of marconi antennas.   Connection is via 4 mm banana plugs and sockets.  A high Q is obtained through the use of 30 amp cable for the main windings.

For more details, click here.

Sorry - this huge variometer has now been sold.

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Remote controlled variometer and control box
Price: 75
This variometer is an ideal variable inductor for fine tuning the resonant frequency of LF marconi antennas.  Connection is via 4 mm banana plugs and sockets.  It includes a 'Lego'-based variometer drive unit, and a built-in impedance matching transformer.   The control box requires a 12 v DC supply.

For more details, click here.

Sorry - this fine variometer has now been sold.

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Impedance matching transformer
Price: 23
This transformer will match a 50 ohm feeder to a typical resonant LF Marconi antenna, where the feed impedance is usually greater than 50 ohms.  Connection is via 4 mm banana plugs and sockets, and the unit is housed in a splash-proof container.  Includes secondary taps for 50; 100; 150; 200; and 250 ohms.

For more details about matching transformers, click here.

Sorry - this fine matching transformer has now been sold.

 

 

 

3C85 Ring Cores
25 mm OD.  Price: 2-00 each
42 mm OD.  Price: 6-00 each
58 mm OD.  Price: 14-00 each

For more details about these cores, click here.