[Central-Electronics] 200V transmit bandwidth

Tue Mar 2 10:25:30 EST 2021

Does that NC110 BPF also maintain a 90 deg phase shift over that band pass?  I couldn't find any documentation on its phase response over the BP frequencies?  That was the magic of the CE audio filter network which made it superior to the B&W network and those of other companies.

I have had my 100V for almost 30 years now, restored it back in the early 90's and had to fix the BPF issue with the silver mica metal migration in the mid 90's.  I powered mine up a couple days ago and looked at my upper/lower sideband suppression and it was still over 50dB.  And yes, the audio BW was just shy of 4KHz as others have mentioned....  I get rave audio reports as I'm sure you all do too.

Regards, Dennis, k0eoo

-----Original Message-----
From: central-electronics-bounces at mailman.qth.net <central-electronics-bounces at mailman.qth.net> On Behalf Of Robert Nickels
Sent: Monday, March 01, 2021 6:37 PM
To: Jim Candela <jcandela11 at outlook.com>; central-electronics at mailman.qth.net; Kihwal Lee <kihwal at yahoo.com>
Subject: Re: [Central-Electronics] 200V transmit bandwidth

On 3/1/2021 6:01 PM, Jim Candela wrote:
> When someone says I am 4 Khz wide on SSB, or 8 Khz wide on AM, my 
> reply is usually, Thanks OM!

Right you are, Jim,  some guys pay thousands of $$ for rigs to get that kind of response!     I'm happy with my 100V as it is but this looks like it could be a useful alternative for those who want to tailor the filter response:

https://www.ebay.com/itm/Norcomm-NC110-A-High-Stability-Audio-Band-Pass-Filter-HF-Radio-800-3000Hz-NEW/201722397279

Google will produce a datasheet and there are posts on Repeater Builder about modifying the frequency response.  It's a nice small PCB that would easily fit inside the existing module if someone wanted to make it work, and the price is certainly right.

73, Bob W9RAN

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