Checking was not too easy here as I have mono band stations, with band
specific high power band pass filters for my contesting efforts. Trying
15 out was not an issue. I just connected to the 15 meter port on my
patch panel and all was good. But, I have no way to try any WARC bands
out on real antennas, even just listening. I wound up just using a long
piece of coax with the connected shield NOT connected at the watt
meter. On all bands I could hear substantial 'band noise', except for
15 meters and 12 meters, where it was graveyard dead.
So, no transmit or receive on 12 meters or 15 meters.
Steve
On 4/23/2018 10:31 AM, MadScientist1948 wrote:
You are correct about the thread regarding the various switching
relays. They do fail causing lack of output. The fix is simply one of
locating the defective one as there are several or each band.
Of course the other problem is locating good replacements…
I have a few dozen if you find that you need them. They are mostly of
the newer type as seen in the Orions.
I assume your receiver performance is fine on these two bands?
The reason I ask is your description the problem, stating that both 12
and 15 are malfunctioning. This is suspicious.
The Omni VI shares a set of tuned circuits on the local
oscillator/mixer board for 12 meters and 15 meters. Thus, a failure in
that bandpass filter (located between and including D43 and D36 on the
diagram for that board) will cause you to lose both bands on TX and RX
on 12 and 15.
The most frequent reason for this failure is a marginal solder
connection in that region of the board, not an uncommon thing for Ten
Tec. The fix is to simply resolder all the connections on the filter
for those two bands.
Gary
W0DVN
On Apr 23, 2018, at 7:48 AM, Steve Bookout <steve@nr4m.com> wrote:
Hello all,
I have very low/no power output on 12m and 15m. Fine on other bands.
'Somewhere' at 'sometime' I remember 'something' about relays on the
output filter board being a possible cause.
'Someone' please refresh my memory on this. Or, maybe I 'somehow'
imagined this; maybe in a thread I really wasn't following.
73 de Steve, NR4M
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