[Collins] Collins RF Mixer

[Chris Kepus]

Sorry guys.  Here are the pictures. 

-----Original Message-----
From: Chris Kepus [mailto:ckepus at comcast.net] 
Sent: Saturday, January 11, 2014 12:11 AM
To: 'geraldj at weather.net'; 'collins at mailman.qth.net'
Subject: Collins RF Mixer

Jerry and David,
Before I send out an email blast on this, I thought I should give two
Collins experts first crack at helping me identify a component I bought that
showed up on eBay. Please see the pictures attached.

My thinking was to use this "package" and repurpose it as a plug in product
detector in one of my old boat anchors. 

But before I modify this I want to see if I can find out what it was
originally designed to do.  I was unable to locate any info on the internet
(much to my surprise) using the Collins PN of 599-2554.00.  Any ideas??

Thanks,
Chris
W7JPG



-----Original Message-----
From: collins-bounces at mailman.qth.net
[mailto:collins-bounces at mailman.qth.net] On Behalf Of Dr. Gerald N. Johnson
Sent: Saturday, July 14, 2012 8:28 AM
To: collins at mailman.qth.net
Subject: Re: [Collins] Collins xtal filter help

In normal Collins filter nomenclature, X308K0D100 means X for crystal
filter, 308 for center frequency (or sometimes carrier frequency for a SSB
filter), D for case and 100 for bandwidth though sometimes the trailing
digits apply to a particular filter, and don't indicate bandwidth. Surplus
Sales of Nebraska is willing to sell one for $125 but admits no information
other than a picture which makes it look to be in the KWS-1 era.

I doubt 100 stands for 10 kHz bandwidth as it would with a mechanical filter
because at 308 kHz 10 kHz is an impractically wide bandwidth for crystals,
more likely its 100 Hz like the 200 Hz for a F455D D200 filter that plugs
into a 75S-3B.

If the filter is to Collins normal specifications it will take about 100 pf
to resonate each end. Drive it with a high impedance signal sourcd and load
it with high impedance (like 10K to 100K) and sweep it manually is usually
better, fast sweeps WILL make it ring.

73, Jerry, K0CQ, Technical Adviser to the Collins Radio Association

On 7/14/2012 12:19 AM, L D Ritta wrote:
>
> Hello All
>
> I have a Collins xtal filter but I have no idea what frequency or 
> bandwidth it is.
> These are the number etc
>   p/n 526-7103-00  type X308K-D100 cust p/n 293-0950-00 Anyone have 
> any ideas?
>
>
> 73's
>
>
______________________________________________________________
Collins mailing list
Home: http://mailman.qth.net/mailman/listinfo/collins
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Collins at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html