[Collins] Collins RF Mixer

Brian cosmophone at yahoo.com
Sat Jan 11 17:38:06 EST 2014


Ditto

Sent from my iPad

> On Jan 11, 2014, at 12:52 PM, "Carl" <km1h at jeremy.mv.com> wrote:
> 
> 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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> 
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