The board will need to be removed from the radio. It is a tight fit between
a shield and the back panel. Both top and bottom covers will need to be
removed as well as the bracket that supports the speaker. Everything plugs
in and cables are or were or should be numbered. Take care in removing the
relays. Too much heat and one will lift the solder pads, creating another
issue to be resolved.
Yes, either K4 or K5 can be bad, i.e. open coil is typical. There could be
other issues not causing the relays to switch for those 2 bands but it is
more common for the coil on a relay to open. One relay being K5 switches
the input to the filter section from the PA and the other one K4 switches
the output of the filter section to the TR relay. Both 15M and 17M use the
same filter section.
Yes, you can remove one relay and measure that one. Then you can measure
the one remaining on the board. As my luck goes, the one I remove is always
the good one.
If you don't have a schematic, I suggest you obtain one. The 564 manual is
available for download on the Tentec Website under DOWNLOADS and then
Obsolete-Manual-Downloads. Scroll down to the 564 and click on the link to
the right that says 564 Manual.
See page 4-3 for the schematic of the Low Pass Filter board.
73
Bob, K4TAX
DISCLOSURE:
All opinions expressed herein are solely those of K4TAX and do not reflect
opinions, ideas, policy or practice of other persons or companies including
Ten-Tec / R F Concepts.
This is to inform all persons I am a Ten-Tec Ambassador and I receive
compensation according to the Ten-Tec Ambassador program. In addition, I
serve as a volunteer beta test person to Ten-Tec for the Omni VII, Eagle and
Argonaut VI radios. I am not an employee of Ten-Tec and hold no employment
relationship, no financial or other interests, nor do I conduct any
commercial business, direct or indirect, with Ten-Tec.
----- Original Message -----
From: "Dave Edwards" <kd2e@comcast.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Saturday, October 25, 2014 8:17 PM
Subject: Re: [TenTec] OMNI VI illness
Bob...is the low pass filter board such that the relays can be removed
with the board in the radio...or does the low pass filter board have to
come out? Am I correct in that EITHER K4 or K5 could be bad causing both
bands to go out? So, if I replaced them both...I'd solve the
problem...or take one out, then I can measure them individually...one out,
and one in the radio...hoping that I removed the bad one. Is that about
right??
....Dave
On 10/25/14, 9:01 PM, Bob McGraw - K4TAX wrote:
Most likely a relay coil open being either K4 and/or K5 on the Low Pass
Filter board. Both bands, 17M & 15M, use the same filter section which
is switched by those two relays. This is the vertical board at the back
of the radio.
If you pull them to check them, replace them. Since the coils are wired
parallel, it is a bit of a challenge to figure just which one is bad with
in circuit measurements. My luck, I usually remove the good one first.
Go figure! Tentec Service has replacements. There's 12 of them on the
board. Unless you have time and money to replace all 12, I'd order 4 pcs
and replace 2 keeping 2 as spare.
73
Bob, K4TAX
----- Original Message ----- From: "Dave Edwards" <kd2e@comcast.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Saturday, October 25, 2014 6:41 PM
Subject: [TenTec] OMNI VI illness
Can anyone suggest if there is anything to check on this problem?
OMNI VI+, otherwise working fine, but....
No output on 15 or 17 meters.
I can hear the signal on another receiver, but no output at all.
Receive OK, and all other bands transmit fine.
Is there something switched in for just 15 and 17?
Thanks for any thoughts!
....Dave
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