When You say you're hearing a buzz in the background indicates to
me either severe line noise or, more likely, TV video from some high
power station TV transmitter. Try a substitute simple home made
ground plane antenna to rule out intermod generated from the antenna.
If noise is still
Skipp,
I was also surprised by your problem with the Krylon clear spray.
I have also been using the clear UV-resistant Krylon #1305 spray (NOT
the regular stuff)for over 45 years on both my ham commercial
installations without any problems. The UV clear spray is usually a
special item
the amp. That's how I finally located the
manual for my
N1275A amplifier.
73, Eric Lemmon WB6FLY
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of George
Sintchak
Sent: Tuesday, April 01, 2008 7:48 PM
To: Repeater-Builder
PROTECTED]
wrote:
George,
Is this PA in a unified chassis. Mot built base stations with such
a PA that was mounted beside the exciter With heat sink sticking
out. It used the same PA as in the mobiles.
73, ron, n9ee/r
From: George Sintchak [EMAIL PROTECTED]
Date: 2008/04/01 Tue
Hi All,
I've searched the archives website for info on this Amp and can't find
anything. It's sort of similar to the N1275A or the N1248A convert-a-com
amps but for a Motorcycle (I was told). It looks like the back end of a
MoCom 70 heat sink. I need more specific schematic or manual info so I
Some years back, when we installed the repeater (also 146.760/160) in
a new building, we noticed a weak buzz...buzz signal ~once a second,
very near the input frequrncy. After much searching, it turned out to
be the smoke alarm heads within the building, all hard wired into
their own AC line.
I have a Mirage B1016 Amp that uses SRF3417 bipolar transistors as
the finals dated from 1988. I have schematics dated 5-1-84 and also a
newer schematic for the G gasfet version dated 8/7/89 that uses
MRF247's. The amp is operating normal and making rated output power
of 160 Watts in class C FM
Anyone have an extra Amp available for spare parts. It looks like I've
lost one of the finals due to self oscillation and destruction.
Polyfet has a few in stock (lotsa $$$) but it's no longer reccommended
for new designs. I can't seem to find a suitable (newer)substitute
using the AT
I remember reading an article about a repeater in the late 40's or
early 50's that was on a mountain top in Arizona. It was AM mode,
repeated from 28 MHz (I think) to 50 or 144 Mhz, or maybe it was
split site. To be legal, all was logged on a very slow tape recorder.
That's about all I can
I cdnuolt blveiee taht I cluod aulaclty uesdnatnrd waht I was rdanieg.
The phaonmneal pweor of the hmuan mnid, aoccdrnig to a rscheearch at
Cmabrigde Uinervtisy, it deosn't mttaer in waht oredr the ltteers in a
wrod are, the olny iprmoatnt tihng is taht the frist and lsat ltteer be
in the
Hello all. I'm looking for more info, schematics, etc on this nice 220
MHz amp, built around 1992. I have the info that N2CKH has posted on
his website (see http://www.n2ckh.com/125m_rptr.htm) but I would like
more specific info (schematics) about this amplifier chassis. I've
searched the 'net
to be any plethora of tube supply wires, etc..I'll have to look
again.
R.
On Sun, 18 Feb 2007 22:53:30 -0500, George Sintchak [EMAIL PROTECTED]
wrote:
The K-8436-A Permakay filter (first generation)was the large sized
455 kHz unit that was used in the Sensicon A series receivers.
It
had
I remember having a similar 6 Volt Tx/Rx version in the mobile. That
vintage Xmtr used 807's in the final for 50 Watts output and an AT
cut FT243 xtal running at 1.0943 MHz with 48 times multiplication to
get adequate deviation of +/-15 kHz. The xtal would rattle in it's
holder. (that was
As I mentioned in my earlier posting, The last IF is probably 1.7 MHz
if the receiver model is a FMRU13V(A). A rcvr without the (A) in
the model number was a less selective receiver that (I believe) used
a higher freq last IF. That may be what you have with the 2.9 MHz
last IF for low band
Steve, I will send you an email with description pictures of PD220
antenna dissassenbly I did about a year ago. I want to contribute this
as an article for the group, but didn't have the time to finish it up
yet, but all the info you need is included. Need ur email address.
George / WA2VNV
Don, You don't mention what band/frequency the Micor is on, (I assume
UHF) and if you have a station monitor as you stated, it has a
wattmeter built in that can measure the power level from the low
level exciter board up through the output stage. Of course, you'll
need an RF RCA connector to
Micor series TLE1713A-3. Looking for schematics, metering info, etc.
and/or a manual if you have one to spare or can copy part of a manual.
For non-commercial use in an amatuer repeater. The amplifier seems to
be working fine. 2 Watts in ~90+ max Watts out (un-controlled) at 449
MHz. I will
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