[TenTec] PARAGON 585 SERVICE MANUAL

[Bob, WB2VUF]

Hi, All,

I fixed PLL issues in my own and a friend's Paragon.  I narrowed down 
the problems to the offending VCO, then reflowed the solder on any joint 
that looked suspicious. I never removed components, except for a few 
electrolytic caps that were microphonic.  I replaced them with Tantalum 
caps.

Faults can arise in eight the major loop or the minor loop board.

The Major Loop board covers 4 bands:
1   22-30 MHz
2  14-22 MHz
3  7-14 MHz
4  0.1-7 MHz

If just 160 and 80 are unlocking, the fault is in VCO 4.  With connector 
90 facing you, VCO 4 is the one on the far right.

The VCO test point is at the junction of Q1-C and Q3-C.  The VCO voltage 
should be at about 3.0 V at the low end of each of the 4 bands, 
increasing to about 7.6 V at the high end.  You may have to tweak the 
VCO coil to get it to stay locked over the whole band.

I do have the Ten-Tec Paragon 585 alignment instructions.

73,

Bob WB2VUF


On 3/10/2025 9:32 AM, Steve Cochrane wrote:
> That is a common problem with theTT585. Is it all bands or just 160 and 80 meters. I have two Paragons also and they both go out of lock on the lower frequency bands. I fixed them a couple of times, but after a while they do the same thing again. I'm not fixing them again. I don't think you'll find the problem in the service manual. The story is that the boards weren't properly cleaned before the components were installed and the solder didn't adhere properly. My understanding is the only way to permanently fix the problem is to remove all the components on the board and re-clean it then carefully replace everything. There used to be a lot of info on the internet, maybe there still is.
> Steve w7jsc
> Get Outlook for Android<https://aka.ms/AAb9ysg>
> ________________________________
> From: TenTec<tentec-bounces+w7jsc=msn.com at contesting.com> on behalf ofsnowy.howell at btinternet.com snowy.howell--- via TenTec<tentec at contesting.com>
> Sent: Monday, March 10, 2025 7:11:24 AM
> To:tentec at contesting.com <tentec at contesting.com>
> Cc:snowy.howell at btinternet.com snowy.howell at btinternet.com <snowy.howell at btinternet.com>
> Subject: [TenTec] PARAGON 585 SERVICE MANUAL
>
>
> Hi all
>
> Can anybody point me in the right direction to obtain the 585 PARAGON
> SERVICE MANUAL, I had a provisional sale for 1 of my 2 paragons, the
> other has a persons name on it, but during testing prior to sale i found
> that VCO 1 in the PLL compartment has gone out of lock, it was unused
> for a couple of years and kept in my dining room, nice and toasty!.
>
> So looking for a service manual to assist with the repair.
>
> I have the 2 x downloads from the 2 x Bob,s WB2VUF and K4TAX, i was lead
> to believe that this problem had been eliminated on the radio, hence it
> was up for sale ( due to ill health and my son's not radio inclined).
>
> Meanwhile i have my BMW R100 RS to sort out, rear disc brake seized ,
> master cylinder and linkage!.
>
> 73
>
> Snowy G0HZE
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