In some way this page "disappeared" from my computer and from the server... I can't say anything, but I really do not know what happened. I have tried to "restore" this file as I remember it, but I'm also sure that it's not 100% complete. If somebody managed to download this file before it disappeared, please send it to me!
The idea is just to be able to connect the front-end to a power-supply and possibilities for measurements. An advantage with a direct connection between the rear antenna connector and the front-end is that it's better when adjusting the front-end, there is no influence of any extensionboard.
The Compar-connector is held by two pieces of aluminium, these originates from an old circulator from an old base-station for mobile-telephone...
I feed the test-jig with 13.6VDC. The incoming DC-source is filtered with a small ferrite toroid. I don't know how effective this is, and I don't think that one must have a ferrite, but I usually place them with some turns of the DC-cable before all radios or accessories. I don't know anything about the ferrite that is used but the type is found on cables for PC-equipment and they must do something good... A big difference compared with PC-equipment is that PC-equipment normally only have a half turn, ie the cable just go trough the ferrite and I use at least two turns! (This increases the inductance with about 16 times.)
Some signals are needed to control the front-end, AGC and ATT are both present at the original. ATT is controlled with a switch and AGC is tested with a potmeter, both connected directly to the Compar-connector. This is at least ok for the original front-end since the AGC is made with a dualgate-MOSFET and these do not need any current. The resistors on the front-end are 100K so I use a 1K-potmeter.
This results in this simple DC-schematic. The "missing" pins on the front end are found here. Please note that I have modified pin7, now with 13.6V!
This test-jig is built with a double-sided Compar-connector and a big drawback is that one must be 100% sure, when a front-end is fitted, since there are voltages present on both sides! I think it's best to get a single-sided connector.