[TenTec] Delta II intermittent RX (VCO issue?)

[Mike Bryce]

The solder on the VCO isn't the best. 

The fix is simple. I had to do this repair I
On several delta IIs. 

Remove the pcb, it's under the sun chassis 

There are three VCOs. 

I usually work on all three. 

Under the mouse coffins, re solder every joint. 

Watch you don't make solder  bridges!! 

According to long time ten tec service guy Gary green, the potting goo shrinks a bit and pulls parts out of an already iffy soldering job. 

It's not hard to do but requires a good eye and steady hands 

Mike wb8vge

Sent from my iPhone

> On Dec 12, 2015, at 8:26 PM, <km2km at twc.com> wrote:
> 
> A few years into using my Delta II the same issues popped up. and I sent it back to TenTec.  They said that in the original runs there were soldering issues on the VCOs.  The one that was a problem for me was the one that handled 15 meters.  A few years later the same prroblem, and the second time TenTec fixed it - no charge.  
> 
> I've been using my Delta II daily since the mid 1990s - traveled overseas etc. so it has been around and still a joy to use.  
> 
> So, the problem described is  known issue, but can be fixed - a reflow the solder.  Not for me to do, but call TenTec to ssee if they will restore it.
> 
> 
> Kris KM2KM 
> MERSCHROD
> 123 Warren Road
> Ithaca, NY 14850
> 
> ---- Steve <wa9jml at frontier.com> wrote: 
> 
> =============
> My Argonaut II had VCO problems similar to what you describe. I sent it in to Ten Tec Service and it has worked fine ever since. I don't remember what the did to fix it. 
> 
> Steve WA9JML
> Sent from my Verizon Wireless BlackBerry
> 
> -----Original Message-----
> From: Al Gulseth <wb5jnc at centurytel.net>
> Sender: "TenTec" <tentec-bounces at contesting.com>
> Date: Sat, 12 Dec 2015 18:56:41 
> To: <tentec at contesting.com>
> Reply-To: wb5jnc at centurytel.net,
>    Discussion of Ten-Tec Equipment <tentec at contesting.com>
> Subject: [TenTec] Delta II intermittent RX (VCO issue?)
> 
> My recently acquired (from an estate) Delta II/536 exibits intermittent 
> operation on the 14.5 - 21.5 MHz range (VCO 3) and has also gone dead once 
> briefly on the < 7.5 MHz range (VCO 1.) The SK's son informed me of 15M etc. 
> intermittent operation when I bought it, and in looking at the manual I'm 
> wondering if a VCO alignment is what is needed. (The other VCO ranges seem to 
> function correctly when this is happening, thus my focus on VCO 3.)
> 
> Has anyone run across this type of issue on a 535/536, and if so, what was the 
> solution - alignment, or something else?
> 
> TNX/73, Al
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