[Collins] Collins RF Mixer

[Carl]

Attachments dont go thru on qth.net.

Maybe it is time for this forum to move into the 21st century and find a new 
home so photos and other info can be shown, stored, etc.

Carl
KM1H


----- Original Message ----- 
From: "Chris Kepus" <ckepus at comcast.net>
To: <geraldj at weather.net>; <collins at mailman.qth.net>
Sent: Saturday, January 11, 2014 3:14 AM
Subject: Re: [Collins] Collins RF Mixer


> 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
>>
>>
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