[TenTec] 9420 PS Problem

[d.e.warnick at comcast.net]

OK, I dug the package out 

The Transformer is a Hammond Manufacturing 226L16 

Dual Primary, Dual Secondary 

Primary is 117/234 V 50/60 HZ 

Secondary: 

     Serial 16V/2.2A 

     Parallel 8V/4.4A 

You will want them in series, I'm sure 



I hope this helps 



73 es gud luck 

Dave 

WA3F 





----- Original Message -----


From: "Rick W" <ve7tk at yahoo.ca> 
To: n4py3 at earthlink.net, "Discussion of Ten-Tec Equipment" <tentec at contesting.com> 
Sent: Sunday, June 9, 2013 1:57:24 PM 
Subject: Re: [TenTec] 9420 PS Problem 

Looking at my calculations (assuming 0.7 V drop on each diode): 

    (12.6 VAC * 1.414) - (2 * 0.7) = 16.4 VDC at the regulator. 

When you add in any capacitor ripple I think this is pretty close to the margin.  I think you are right Carl.  I need closer to 18 VDC at the regulator. 

A 16 VAC transformer would give me 21.2 VDC and that is well within the specs of the 7815. 

I have found a dual primary (115/230 VAC) transformer with 8/16 VAC out at 5.4/2.7 amps (parallel/series ratings).  The physical size is close to the original (Digi-Key P.N.  237-1261-ND).  Cost is $11.14 CAN plus shipping and taxes.   

73, 
Rick 
VE7TK 

Website: http://www.ve7tk.com 



>________________________________ 
> From: Carl Moreschi <n4py3 at earthlink.net> 
>To: Rick W <ve7tk at yahoo.ca>; Discussion of Ten-Tec Equipment <tentec at contesting.com> 
>Sent: Sunday, June 9, 2013 8:57:58 AM 
>Subject: Re: [TenTec] 9420 PS Problem 
> 
> 
>It's most likely at least 18 vac output on the transformer. 
> 
>Carl Moreschi N4PY 
>121 Little Bell Dr. 
>Hays, NC 28635 
>www.n4py.com 
> 
>On 6/9/2013 11:10 AM, Rick W wrote: 
>> Steve and Dave thanks for getting back on this. 
>> 
>> I was wondering if either of you knew the transformer output specifications.  I'm guessing it is around 12.6 VAC at perhaps 1 amp or so.  (The regulator is a 1-amp 7815.) 
>> 
>> It is an interesting design with the transformer on 24/7 while AC power is applied.  I shut off AC to all my supplies with a Master switch in the station at the end of each day. 
>> 
>> Interesting that the T-T replacement is not an exact match.  Digi-Key has several in stock and their delivery time to my QTH is amazing.  Just want to be close to the original in voltage and current rating. 
>> 
>> Thanks for the surge suppressor tip bob.  I'll look into it. 
>> 
>> 73, 
>> Rick 
>> VE7TK 
>> 
>> Website: http://www.ve7tk.com 
>> 
>> 
>> 
>>> ________________________________ 
>>> From: Steve Hunt<steve at karinya.net> 
>>> To: Discussion of Ten-Tec Equipment<tentec at contesting.com> 
>>> Cc: d.e.warnick at comcast.net; Rick W<ve7tk at yahoo.ca> 
>>> Sent: Sunday, June 9, 2013 7:35:20 AM 
>>> Subject: Re: [TenTec] 9420 PS Problem 
>>> 
>>> 
>>> 
>>> Mine failed 9 years ago and I fitted a £15 replacement from RS-Components here in UK. Not much help to you as the part is no longer available :( 
>>> 
>>> It's worth noting that transformer is powered 24x7x365 if you leave 
>>      the 9420 plugged in to a powered wall socket. 
>>> 
>>> Good luck in your search. 
>>> 
>>> Steve G3TXQ 
>>> 
>>> 
>>> 
>> _______________________________________________ 
>> TenTec mailing list 
>> TenTec at contesting.com 
>> http://lists.contesting.com/mailman/listinfo/tentec 
>> 
> 
> 
> 
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