EME173 2M + 6M + 70CM PREAMPLIFIER KITS
 Monday 28th June10

• KIT CONSTRUCTORS ALERT:
• EME173A70 KIT CONSTRUCTION NOTES:
• EME173A2 KIT CONSTRUCTION NOTES:
• EME173A6 KIT CONSTRUCTION NOTES: Soon
• SIMPLE BIAS TEE
• KIT FAULTS & MODIFICATIONS:
• PROTOTYPE TESTS: Soon
• ORDER A PREAMPLIFIER KIT

Please Note: that all information including pictures on this web page are copyright to Mini-Kits & must not be used on any other web site.

The EME173 Series Kits are low cost receive only preamplifier kits suitable for many Ham Radio applications to improve weak signals due to either high coaxial cable losses, or a low gain receiver. These Kits are particularly suited to being retro fitted into older Transceivers to improve the weak signal performance. Many commercially produced Transceiver & Receivers may have very low Noise figure Gas FET front ends, but generally lack enough gain in the receiver to comfortably listen to weaker narrow band signals like SSB or CW. The 70cm Preamplifier Kit is particularly suitable for improving 435MHz Satellite reception, & Amateur Television pictures. The 2M Preamplifier Kit can be tuned to be used at 137MHz for weather satellite use.

EME173A70 KIT CONSTRUCTORS ALERT

Pre June 2010 Prototype 70cm Kits only, there is a mistake on the PC board overlay for the mounting of one of the 10uF capacitors near the 78L08 regulator. the overlay diagram shows the +ve connection of the capacitor the wrong way around.

The above Images show how the coils are wound for the 70CM 430MHz version of the Kit. Take note of the winding direction of L2 & L3 especially so that they fit the board correctly. If you want to connect coaxial cable directly to the board, use good UHF construction practices as shown in the picture above.

The above Images show how the coils are wound for the 2M 145MHz version of the Kit. Take note of the winding direction of L1& L3 especially so that they fit the board correctly. If you want to connect coaxial cable directly to the board, use good UHF construction practices as shown in the picture above.

SIMPLE BIAS TEE

PARTS LIST   2 x 1nF Ceramic capacitor 1 x 10uF Electro Capacitor 1 x T37-6 Toroid ( 2M/70cm ) 1 x length 0.3mm ECW 2 x SMA sockets

A simple Bias Tee circuit can be constructed on a small FR4 1.6mm double sided PC board. A 50ohm, 3mm wide stripline can be made by cutting the board using a scalpel, knife. Refer to the Kit notes on how to wind the inductor including the number of turns required for each band. Either standard ceramic leaded capacitors or chip capacitors can be used. SWR return losses were tested at 435MHz & were found to be excellent. Loss on 146MHz is 0.005dB & on 435MHz 0.134dB.

KIT FAULTS & MODIFICATIONS EME173 KIT

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