[time-nuts] Symmetricom 58535A GPS antenna splitters FS

Mike Feher mfeher at eozinc.com
Sun Apr 4 21:45:01 EDT 2010


Bob -

Glad you received the splitters OK and hope you had a nice Easter with your
family. I have never had one of these apart, so, cannot comment at this
time. Some time ago I did take an HP splitter apart, but, only after it
died. Turned out to be the 3.2 volt regulator. I just bypassed it with a
piece of wire and it has been working for years. Since the GPS receiver
driving it is 5 volts, the amplifier inside did not mind the difference
between 3.2 or 5 volts. These are all supposed to be smart splitters, as you
well know, so, I wonder how simple resistive divider on the output of the
amplifier alone would work. Regardless, sure sounds like it would be easy to
make a line amp from one. Just make sure the DC gets from the port you are
going to use to the amp, and will also provide adequate load to the receiver
to let it think it is connected to an antenna and not give a fault. Good
luck with trying to find a schematic. Probably easier to reverse engineer
it. Regards - Mike

Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960




-----Original Message-----
From: Bob Camp [mailto:lists at rtty.us] 
Sent: Sunday, April 04, 2010 7:42 PM
To: Mike Feher
Subject: Re: [time-nuts] Symmetricom 58535A GPS antenna splitters FS

Hi

The gizmos came in while we were off to visit the kid in Maryland. They look
great - THANKS!!!

As far as I can see looking at them, each channel terminates in about an 8
db pad. I don't have a microscope handy so the resistor markings are a bit
hard to read. If I'm right about the pad, simply pulling it out should turn
them into line amps. 

Off to look for a schematic ....

Thanks again!

Bob


On Mar 29, 2010, at 7:47 AM, Mike Feher wrote:

> Thanks Bob - I am going to try and get them all in the mail today. Regards
-
> Mike
> 
> Mike B. Feher, N4FS
> 89 Arnold Blvd.
> Howell, NJ, 07731
> 732-886-5960
> 
> 
> 
> 
> -----Original Message-----
> From: Bob Camp [mailto:lists at rtty.us] 
> Sent: Monday, March 29, 2010 7:39 AM
> To: Mike Feher
> Subject: Re: [time-nuts] Symmetricom 58535A GPS antenna splitters FS
> 
> Hi
> 
> Paypal just went out.
> 
> Bob
> 
> On Mar 29, 2010, at 7:24 AM, Mike Feher wrote:
> 
>> Bob -
>> 
>> Yes, modifying a two port may be the easiest way to go. If you can get a
4
>> port, you will probably realize more gain. I also have a bunch of 4
ports,
>> but not nearly as many as the two ports. Please let me know how you
intend
>> to pay for these. If by check, just let me know when you mail it, as I am
>> not going to wait till it clears. I sold a total of 14 of these, and it
>> would be convenient if I could mail them all at once. One guy is paying
> buy
>> check, the rest have already paid by PayPal. I did send you an invoice.
> So,
>> just waiting to hear from you :). Thanks - Mike
>> 
>> Mike B. Feher, N4FS
>> 89 Arnold Blvd.
>> Howell, NJ, 07731
>> 732-886-5960
>> 
>> 
>> 
>> 
>> 
>> -----Original Message-----
>> From: Bob Camp [mailto:lists at rtty.us] 
>> Sent: Saturday, March 27, 2010 9:02 AM
>> To: Mike Feher
>> Subject: Re: [time-nuts] Symmetricom 58535A GPS antenna splitters FS
>> 
>> Hi
>> 
>> Line amps appear to be unobtanium. I'm wondering if it would be better to
>> mod some two ports as line amps ...
>> 
>> Ok, my details are:
>> 
>> Bob Camp
>> 20 Roaring Creek Court
>> Carlisle PA 17013
>> 
>> Paypal ok for payment or do you prefer another way?
>> 
>> Thanks!
>> 
>> Bob
>> 
>> 
>> On Mar 26, 2010, at 11:35 PM, Mike Feher wrote:
>> 
>>> Bob -
>>> 
>>> Thanks for the purchase. I will send you an email sometime tomorrow
>> letting
>>> you know the exact postage and all for 2 of them. Sorry, no line amps.
>>> Regards - mike
>>> 
>>> 
>>> -----Original Message-----
>>> From: Bob Camp [mailto:lists at rtty.us] 
>>> Sent: Friday, March 26, 2010 9:31 PM
>>> To: Mike Feher
>>> Subject: Re: [time-nuts] Symmetricom 58535A GPS antenna splitters FS
>>> 
>>> Hi
>>> 
>>> Sounds like a good price. 
>>> 
>>> I'll take a pair if you still have them.
>>> 
>>> Have any of the line amps by any chance?
>>> 
>>> Thanks!
>>> 
>>> Bob
>>> 
>>> 
>>> On Mar 26, 2010, at 7:29 PM, Mike Feher wrote:
>>> 
>>>> I have the same items available in original sealed bags, for $35 each
> for
>>>> one, $65 for two, and $120 for 4, plus actual priority shipping. So for
>>> one
>>>> that is about $6, and for 2 or 4 it is about $11. Sorry to advertise on
>>>> here, but, I know I am not setting a precedent. PayPal or checks
> welcome.
>>> I
>>>> am now in Atlanta, but will be home tomorrow. Regards - Mike
>>>> 
>>>> 
>>>> Mike B. Feher, N4FS
>>>> 89 Arnold Blvd.
>>>> Howell, NJ, 07731
>>>> 732-886-5960
>>>> 
>>>> 
>>>> 
>>>> -----Original Message-----
>>>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
>>>> Behalf Of J. L. Trantham, M. D.
>>>> Sent: Friday, March 26, 2010 6:55 PM
>>>> To: Discussion of precise time and frequency measurement
>>>> Subject: Re: [time-nuts] GPS antenna splitters
>>>> 
>>>> I have used one of these (ePay item 370265750113) and it works well.
>>>> 
>>>> Joe
>>>> 
>>>> 
>>>> 
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>>> 
>> 
> 





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