[1000mp] Mark V Filter Choices

[John Rippey]

In response to Thomas' (DK3DUA's) posting, I offer the following. I 
received advice from Barry, N1EU and George (W2VJN) at Inrad regarding the 
filter choices for my new (used) Mark V and then did the following 
installations:

	1 Inrad # 705c 500 Hz Collins CW filter in sub-receiver 2d IF

	1 Inrad # 703c 400 Hz CW filter in 3d IF of main receiver (cascaded with 
stock 500 Hz CW filter in 2d IF)

	1 Inrad # 711b 1.8 kHz SSB filter in 2d IF of main receiver

	1 Inrad # 714c 1.8 kHz SSB filter in 3d IF of main receiver

	On CW, I now have a choice of 1.8/1.8 kHz or 500/400Hz cascaded filters 
via the Normal and Narrow 1 buttons.

	On SSB, I have chosen menu settings that give me ATT/6.0 kHz, 2.4/2.4 kHz, 
and 1.8/1.8 Khz filter settings via the Normal, Narrow 1 and Narrow 2 buttons.

	My preliminary finding is that these filters work very well. They seem 
very unintrusive and simply do their job. One surprise is that the Inrad 
1.8 kHz SSB filters are quite useable under almost any conditions (even 
reducing QRN to some extent). The received audio is still quite readable in 
this narrrow setting, surprisingly so based on my experience with other 
transceivers.

	My main caution is that installing the filters is best done as a one-time 
project. The worst part of the exercise is removing the multiple pieces of 
metal cladding from the Mark V, saving all the many screws, and then 
replacing everything. So be sure you have chosen the correct filters for 
your needs before digging in.

73,
John, W3ULS