________________________________
From: "d.e.warnick@comcast.net" <d.e.warnick@comcast.net>
To: Rick W <ve7tk@yahoo.ca>; Discussion of Ten-Tec Equipment
<tentec@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@yahoo.ca>
To: n4py3@earthlink.net, "Discussion of Ten-Tec Equipment"
<tentec@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@earthlink.net>
To: Rick W <ve7tk@yahoo.ca>; Discussion of Ten-Tec Equipment
<tentec@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@karinya.net>
To: Discussion of Ten-Tec Equipment<tentec@contesting.com>
Cc: d.e.warnick@comcast.net; Rick W<ve7tk@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
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