Bill,
All indications are the extra roofing filters are not necessary. The DSP
filters have a shape factor of 1.05 to 1 (unbelievable), and the DSP has a
100 db range.
I use an Astron 35. You can't go wrong with it.
Carl Moreschi N4PY
----- Original Message -----
From: "Bill Tippett" <btippett@alum.mit.edu>
To: <tentec@contesting.com>; <tentec_orion@yahoogroups.com>
Sent: Monday, May 05, 2003 6:57 AM
Subject: [TenTec] Orion Questions
> Hello All!
>
> I've ordered an Orion from the third production run
> which should be delivered in June and have a few questions:
>
> 1. I see Inrad is having a 10% off filter sale in May, and am
> considering their 400 Hz (#759) and maybe the 1800 Hz (#761)
> for $103.50 each after the discount.
>
> http://www.qth.com/inrad/
>
> Given the roofing filter scheme in the Orion, I'm inclined to
> believe optional filters might not be necessary, since the stock
> 1 kHz and 2.4 kHz should provide exceptional adjacent channel
> rejection, and DSP filtering can take care of what remains.
> Question for Orion users who have optional filters installed:
>
> Are the optional filters truly worth adding? For CW, SSB or both?
> I really want to hear from folks who have actually used Orions with
> optional filters in extreme conditions (contests, low bands, etc).
>
> 2. This is a more general question for all. I need to get a power
> supply for my Orion but am very concerned about RFI that may
> be generated by switching power supplies. The last thing I want
> to hear is a bunch of RFI birdies when I'm digging weak signals out
> of the noise on 160. My inclination is to go with a traditional
> power supply like the Astron RS-35, but wonder if anyone has any
> experience with RFI from power supplies (Ten Tec, Astron, others)
> for the Orion?
>
> 3. Does the Model 310 cooling fan run continuously or is it temp-
> controlled? (It appears that it runs continuously with an attached
> plug for 12V on the back of the Orion). How noisy is it? I would
> normally plan to unplug it except for contests, but it seems like
> cheap insurance since I know that heat is the number one cause
> of semiconductor failure.
>
> http://www.tentec.com/HFaccyStore.htm
>
> Thanks for your thoughts!
>
> 73, Bill W4ZV
>
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