[TenTec] OMNI VII QSK users with good ears....

[Dennis Jones]

Where does one obtain those UM2110 diodes?

Dj  k6rcl


On Dec 9, 2007, at 11:02 AM, Paul Christensen wrote:

>> I believe the Argo V DOES use diode switching.  The
>> pin diodes used are exotic 1N4007.
>
> The Omni 6/6+ also uses a handful of 1N4007 diodes as part of the T/R
> circuit, particularly for the 2nd Rx port.  However, isolation
> characteristics are not nearly as good as a true PIN diode  
> structure.  Where
> isolation is not a primary concern, the 1N4007 can be used as a low- 
> cost,
> low/mid-power RF switch.   On the Omni 6, I was able to increase port
> isolation by better than 40 dB by replacing the 1N4007 diodes with  
> high
> power UM2110 PIN types from Microsemi.
>
> Port isolation on the Omni VII easily matches or exceeds what I was  
> able to
> achieve on the modified Omni 6.
>
> Paul, W9AC
>
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Dennis Jones
k6rcl at cox.net