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@contesting.com> on behalf
ofsnowy.howell@btinternet.com snowy.howell--- via TenTec<tentec@contesting.com>
Sent: Monday, March 10, 2025 7:11:24 AM
To:tentec@contesting.com <tentec@contesting.com>
Cc:snowy.howell@btinternet.com snowy.howell@btinternet.com
<snowy.howell@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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