[TenTec] 9420 PS Problem

[Rick W]

Many thanks Dave.  I think I'm on the right track with the Digi-Key transformer.

73,
Rick
VE7TK

Website: http://www.ve7tk.com



>________________________________
> From: "d.e.warnick at comcast.net" <d.e.warnick at comcast.net>
>To: Rick W <ve7tk at yahoo.ca>; Discussion of Ten-Tec Equipment <tentec at contesting.com> 
>Sent: Sunday, June 9, 2013 12:50:20 PM
>Subject: Re: [TenTec] 9420 PS Problem
> 
>
>
>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
>
>
> 
>________________________________
> 
>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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