That would seem more likely, although damage should occur to
more things...
Doug Bade
Cleveland Comms.
At 10:00 AM 9/7/2004, you wrote:
I have an MSR2000 on 444.550 for the local ham club / county EMA. The PA (a
110W model) is out again. We just had this repaired by the local Motorola
provide your own pullup, H41-42 must be installed... as
that is the normal source of pullup on the rx-mute control line.
Doug Bade
Cleveland Comms.
KB8GVQ
At 09:48 AM 9/7/2004, you wrote:
I cannot get the CG card to work in a base/rptr MastrII. I've tried 2
dip switch and 1 versatone CG card and Pin
If it is from a Purc ( which it does sound like) it is the ref
oscillator for up to and including 900 mhz simulcast stations. Freq
stability from it at 900 usually holds a hertz or 2 at a ghz... as long as
outside temp does not fluctuate too much or quick. It takes a good day or
so
I am dealing with a similar problem with a Mastr II and a NHRC controller.
The audio sometimes fades out dropping to a very low level, and changes
while you are listening to it on a repeater user, although it comes back
all by itself. It seems to be an analog problem as opposed to just cutting
2 watts reflected into the isolator does not sound good. It should
have better return loss than that unless it is tuned wrong.. I would double
check tuning and try capping it with a dummy load on the output side (
where the tx duplexer port goes) and see if it is different. An
For others who may be looking for it, I have posted it at our
website...
Here is the URL;
http://ohioaprs.net/files/doug/Mastr_II_Station_LBI%27s_Misc/31807d_IDA_Repeater_Control_Panel.pdf
Doug
KB8GVQ
At 09:55 AM 10/25/2004, you wrote:
In all of my Ericsson Tech CD's I cannot
No amateur manufactured radio's, however at least 12-15 models of
900 and some 800 commercial can be readily moved.. There are currently
about 100 repeaters on 902/927 pairings in the US, most of which are less
than 3 years old.. there is a significant effort to modify and build, and
...
73's
Mike Perryman
www.k5jmp.us
-Original Message-
From: skipp025 [mailto:[EMAIL PROTECTED]
Sent: Wednesday, October 27, 2004 1:23 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re: Radios for 900 mhz
Doug Bade [EMAIL PROTECTED] wrote:
No Amateur
The synthesized version is not readily convertible, the crystal control
conversion version is the one referred to...
Doug
KB8GVQ
At 01:41 PM 10/31/2004, you wrote:
I SAW THE DARCOM 9000 LISTED, SO HAVING ONE IN THE CABINET STILL
1. DOSE ANYONE STILL HAVE THE SOFTWARE FRO PROGRAMMING THE
I use omni page pro.. if you look around you can find versions for 150.00
or so that are slightly crippled, but can handle 60 pages with no trouble.
Scan the pages directly into the pdf...
Doug
KB8GVQ
At 06:16 PM 11/20/2004, you wrote:
I've run into a situation, and thought I'd tap the
John;
I am working on developing and documenting a more intrusive
connection method which may turn out to be a best method however, the
simpler solution would be to take control of the audio to the tx by
connecting directly at the exciter door, and use discriminator or vol hi
for rx
I have some GE Mastr III 860 amps, which I am selling, which are
rated at 110w on 26-28vdc.. +10dbm drive. They make 100 or better on
927.9875 and below. Most do 110w. Size is comparable to a Mastr II station
PA. Asking what I consider to be quite reasonable The Maxtrac Exciter
The main problem to watch for is heat/swr issues on the PA as it
is potentially going to cook itself at full rated power with a high duty
cycle... It will make full power and full sensitivity in 52/53 mhz, but I
would de-rate the PA by a bit to protect it if it is going to be on a
Kevin;
I would watch the voltage feed to the PA as just as important as
the specific power level.. The GE power Supply idles high ~15v but drops
into the lower 12.x volts under full load, you can watch it load down as
you increase power.
An Astron RS50 for instance may be set
Jed;
There are several models which can do this... Motorola Spectra 900
for one, GE TMX9315, Motorola Maxtrac 900 with help... GE MDX 900 mhz with
some additional hardware. The Spectra is probably the easiest of the lot...
Some Kenwood 900's can do too, as well as Motorola GTX.. ALL
30-36
36-42
42-50 are the splits.
If you are going to use them for amateur,
I suggest not trying to move a mid split to 10m or 6m, but only use the
adjacent one
Doug
KB8GVQ
At 11:57 AM 1/5/2005, you wrote:
Anyone have at least one or two low band GE MVP
Radios they'd like to sell (or
Basing on sales we did in or around the beginning and the end of the
productions and digging into the memory banks ...
Someone may be able to pinpoint closer butthis should be pretty close...
1971 I believe was the first Mastr II mobile production, State of Ohio
took delivery of about
Hello Steve;
There is a pretty large group of builders assembled in one place,
and hopefully the list owner here will not mind the link post as O.T., but
the group is 900 centric and focused with some 700 list members... it is
here at yahoogroups and it is called AR902MHZ. It is
It is not normal for ICM re-stuffs to drift like that. I would suggest
checking and monitoring the comp line and the 10v reg supply. Both could
exert that much error on the FO that quickly... more likely suspect.
Doug
KB8GVQ
At 03:19 PM 2/7/2005, you wrote:
I recently rebuilt my 440
Amateur radio is co-secondary with all part 15 users ( which includes WISP
users) . We are all secondary to primary licensee's in the Alarm industry
who bought licenses in this band. They are the only licensed primary users
I am aware of. All else secondary on a reasonable non-interfering
it chooses.
Tube equipment like Progline, etc were dropped as they were not
compliant with emissions standards as we went to 25k channel standards.
Nothing more...
Let us consider relevant portions of this discussion instead of
red herrings
Doug Bade
Cleveland Comms.
At 11
I think you need to multiply the physical wavelength by the velocity
factor... which is about ~.8 - .88 or so depending on the specific
cable...on the longest frequency..
Doug
At 05:19 PM 3/14/2005, you wrote:
I'm rebuilding a db-252 corner reflector for use on 2 meters. The
original
Sometimes on the top part is cracked and you can push/turn them out from
the bottom side up by removing the assembly More often than not they
are not cracked all the way through... And always use plastic proper
fitting tools to turn them, never ceramic...
Doug
Yahoo! Groups Links
Building is about building.. craftsmanship...
pride...education, and god forbid maybe even just ... the fun of it
I think maybe you should just find another choir to preach to
Doug Bade
KD8B
At 10:23 AM 3/25/2005, you wrote:
Thought police again!
What happened to free
Dave;
The GTX 900 mobiles can be used for links and such. They are not
designed for that duty cycle however. The front end filters are difficult
to replace, but can be done and will need to be done if you rx anywhere
besides the 927 end of the band.. I know of 2 users for sure who use
wrote:
At 12:04 PM 4/1/2005, Doug Bade wrote:
Dave;
What kind of erp do you need on the link? Is it close/Line of
Sight? You may be able to operate at exciter levels in which case any of
the mobile options will work great.
About 3-5 miles, with yagis. I would figure 1W or less
and
some tweaking. Probably cheaper than the 900 GTX and it will be +_5khz...
Doug
KD8B
At 12:19 PM 4/1/2005, you wrote:
At 12:04 PM 4/1/2005, Doug Bade wrote:
Dave;
What kind of erp do you need on the link? Is it close/Line of
Sight? You may be able to operate at exciter
What is the exact part number ??? I bought some bucket brigade chips many
years ago from digikey, and can check what I have left, which was most of
an IC tube as I recall..
Doug
KD8B
At 11:52 AM 4/2/2005, you wrote:
Ted,
I'd almost beg to buy some of your chips if you can
find them.
It's model name was RP3A if I am not mistaken, made originally for the MVP
mobile to turn it into a repeater. It was built to replace the factory cg
board. It has no remote control or cw functions. Just repeat audio control
and carrier control. It used a comm spec TS32 for encode and decode.
I found my stash of delay line IC's. I do not know if they are of help
as
the numbers look different than I recall of those requested, but here goes..
6) MN3102 Clock Driver Chip
4) MN3206 BBD
3) MN3207 BBD
5) MN3208 BBD
2) MN3209 BBD
1) MN3214 BBD
Any of value to anyone, let me
A better more specific link..
http://www.expandedspectrumsystems.com/prod7.html
Sorry
Doug
KD8B
At 05:50 PM 4/28/2005, you wrote:
Here is an interesting option we may want to look at to replace crystals. I
have experience using one of these on 17.6125 with an external ovenized
oscillator
It uses what looks like a JFET type VCO oscillator running with a
dc controlled/varicap pll on board. I used it to replace a 17.6125
reference oscillator on a synthesized 900 station. The output is multiplied
in this case and used to sync lock a free running 70.45 RX L.O injection
The Millicom version 100w amp was called an ESP2100 or ESP220 in the SEA
world. I do not have docs on it as I thought we might. Sorry. I can tell
you the radio was turned down to 5w to drive it so as to run it linear
properWe had tried some other amps over time but the emission mask was
I have not heard of anyone moving a 800 Rangr to 902 but anything is
possible if you want to try hard enough( although many may not be worth it
:-) ) The 800 Station can be moved if it is a crystal controlled TX and
rx version. The synthesized one will not move without major surgery... Docs
One other possibility is that the I.F. stages are aligned
improperly which to a trained ear ( distortion/flat-topping of part of the
sine wave to what you are hearing) could be mistaken for off frequency .
If the IF alignment was performed at some time with the channel element not
set
GPS disciplined oscillators are only about $300.00 to $400.00 ea.
on the used market today The HP Z3801a series have been appearing for
the last few years, retired from Cellular. 10 Mhz at about 1 Hz at a gHz or
better.
Drive a Flex Crystal oscillator or better yet a
I think your notes on how it is hooked are close but not exact( at
least not the way we have done them in the past) . The comp line needs to
be connected inside the element, A 2C effectively needs to be made into a
5C( or better yet use a 5C channel element). The comp line is a dc
If you jump up to the 902 band, there is an established Itinerant Repeater
Pair in SERA Land and some other states which are patterned after SERA's
Bandplan...
In many of those areas 927.4875/902.4875 is available for Mobile or
Portable Repeater OperationsUnspecified locations and tones..
I would disagree on the later comment as in the commercial world it would
be quite incorrect
We have been using telco 2 wire and 4 wire DC control and Tone control
lines for years. I know of some dispatch operations which use them hundreds
of miles, while not the cheapest method, it still
They look like Telewave products judging by the color
Doug
KD8B
I've uploaded pictures to: http://community.webshots.com/user/wa4ort. Can
anybody identify them for us?
Next question... where can I find a manual so I can tune them?
Thanks,
-- de WM4B
Mike
Kathleen,
Jim;
There is a factory option cable pigtail which an be added
that will put most everything you could need on a external db25
connector... It can be ordered from an Icom dealer. You could build
it but I suspect you would have more problems with the internal
connector than is worth
Physically, yes, practically and without bothering your
users, probably not
Taking packets off the input of the receiver ( mic-e type
packets) is one thing as you can put a tnc on the repeater to mute
the tx audio while it is receiving mic-e type bursts( wiring a mute
When you import the file into your burner you may
be importing it incorrectly... Two formats are
common, Intel and Motorola. If you have a copy of
hex workshop, look at the file and see if it is
an s19 Motorola record image. I went through this
as I programmed a lot of the T800's a while back
I think you may have got the wrong answer to the wrong question.
TX RX makes band couplers for UHF and VHF rated about 1000w each
port. That is what they call a diplexer Diplexer is not a term they
have in their catalog... They come in UHF/VHF and UHF/800-900 .
The answer they gave
I have found that most amateur band couplers or diplexers
do not seem to operate well in full duplex 100 watt 2x environments
for very long. In RX systems, is one thing, but under long TX power
keys they seem to heat up and dis-assemble themselves internally. The
commercial versions
Kevin;
Their perspective is the commercial world and dual band
single antenna repeater systems do not really exist in these bands
using that narrow view. split in at the bottom and split out at
the top they do, but not a dual band antenna. You are quite correct
that it is not an
talking about four
freqs through the feedline/antenna.
Perhaps this is why TXRX said they couldn't or
wouldn't provide something.
Or am I all wrong about the bandwidth issue? I'm
looking at it from a duplexer point-of-view.
Bob M.
==
--- Doug Bade [EMAIL PROTECTED] wrote:
Kevin
Ken;
For me, impending failure usually starts with rx desense out
of nowhere, followed by heat to the touch, followed by noticeable
power output drops... I never really saw it on packet systems as the
short duty cycle helps the heat issue, but many multiband antenna's
exhibit less
Paul;
The Manufacturer specs for the radio will indicate what
services it is type accepted for. I would start with them as they are
still in business, even though it is an older model.
There was a list (I think it may have been a hyper link)
published at one time on the Mastr
There are some extremely broadband linear amps you can find on Ebay
and such that amplify up to 1w from dc to 1ghz with 30-40db gain
which can be driven off the gen port of your monitor for extra
dynamic range. Calibration obviously goes, but when you are trying to
see the bottom of the range,
Sometimes going to a cold weather oil like synthetic can help immensely..
More often than not it will reduce starting drag in cold weather to
help enough...
Doug
KD8B
At 11:35 AM 1/14/2006, you wrote:
Assuming you've tried your friendly auto-supply ...
How about a call right to the Mfgr (or
I have a mod board for them to move them to ham band No software
mods have been published and goodness knows many of us tried. I built
a hardware solution...
MDX and MTD use the same mod board.contact me off list if you
wish for further details
Info on the mod can bee found on my
Skipp;
For openers it has no identifier I do have specific knowledge of
them, we used many of them over the years The TS32 decode time
was the biggest Achilles heel..
Doug
KD8B
At 12:47 PM 2/26/2006, you wrote:
Re: Parkinson Repeater Controller
If anyone in the group has or knows a
Joe M;
I do not believe there has ever been a factory MLS 1
programming tool for PC based programming.. While you can program a
MLS 2 with the PC based MLS software, that software does not talk to
an MLS1 You may be able to write a suitable eprom with an pc prom
burning tool set,
recall correctly, that is http://www.hallelectronics.com/
Joe M.
Doug Bade wrote:
Joe M;
I do not believe there has ever been a factory MLS 1
programming tool for PC based programming.. While you can program a
MLS 2 with the PC based MLS software, that software does not talk
In a Mastr II if everything is correct, you should perceive no
difference from [EMAIL PROTECTED] to [EMAIL PROTECTED] I suspect the IF
alignment
is off. You do not need a sinnader to check this. Most Mastr II are
11.2 mhz IF , some are 9.4 Close couple a strong 5kz deviation
1khz tone at
All test cables and connectors on them exhibit loss,
especially as frequency goes up .You need to account for these
losses by knowing what they are at the freq you are working on, and
even the service monitor is not perfectly constant across it's
bandAlways do a loop check
The PTT input of the ts-32 controls encode If it is connected to
your rx mute gate it would track carrier input The factory
recommendation Coy referred to as I recall was for gating tx tone off
rx tone, which was connecting OUT 1 or 2 ( whichever is the correct
polarity) to the ptt
Cancel that remark NO PTT on that board.. I was off on that
comment... one of the other boards. grrr.. I went and
looked at the schematic.. The factory app note used a clamping diode
or transistor maybe on the encoder side of the circuit on board of
the ts32 at the network in front
Ian;
I do not think you suppled enough info for us to answer
that. While isolators are always a good idea at sites where there are
multiple transmitters, the specifics of why in the preceding
discussion is for specific problems due to exact offset paired
repeaters in the same site
Sorry to the group for that nonsense on the bottom attachment in my
previous reply...NOT sent intentionally.. something embedded
in the reply from the first message I do not think it originated
in my system, but apologize non the less...
Doug
At 11:25 AM 4/6/2006, you wrote:
Bill,
There are many approaches but for simplicity and if cost is
not an issue, Dedicated Auxiliary Receivers like GE Mastr II or
Motorola Spectra TAC with 600 ohm line outs and voting tone cards are
tough to beat. Connected by dedicated phone lines to the voter ( most
all are good to
Mick;
I would say that was way out of line.
From an engineering standpoint your described system has
little to do with a mobile environment which is what the original
poster implied with asking for a mobile duplexer to which a split
antenna system is impossible to make work
Randy;
Do not feel responsible for what happened. Anyone who
proposes something unusual should be prepared to justify it to this
group and should have some evidence to back it or else a really thick
skin.:-)
Too many folks on this list been there, done that to
listen to
Speaking of 6 meter conversions, I have received (2 ) 4 can pass
reject 300 khz duplexers for 72-76 mhz. My thoughts are to cut them
in half and lengthen them about a foot..My question is how important
would it be if the new addition section was copper but was not silver
plated inside, as the
Mike;
These are actually 66-88 also but tuned to 72-76 and very
close spaced. They have 2 notch threaded rod stubs on each can. I was
amazed to see how close spaced they were on the freq's in them. I did
find some information on home plating but looks like the better part
of $500.00
-88MHz)... Let me know how your project
goes, as I was considering the same thing.
73
Mike Perryman
www.k5jmp.us
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] Behalf Of Doug Bade
Sent: Friday, April 28, 2006 9:36 AM
To: Repeater-Builder
Kevin;
The Mastr III station manuals currently document the process
of hooking an external controller to a Mastr III. If it truly is a
Mastr III as opposed to a Mastr IIe there is a quite a
difference. I would suggest you get a manual for it and it should
have the interface in it,
I am not familiar with a tdx 800, but all members of the TMX
800 family have a same or similar VCO which is not capable of going
to 902-928 without surgery, and as there are many more suitable
candidates, it would be a labor of love at best.
We have converted some members of
Anywhere from Free to cost of electric to $2000.00 a month.
Locale is very influential It is extremely variable... I have
sites of $25.00 a month for hams, and $950 a month for paging
carriers 2 way systems.
Major cities can easily double that depending on the site, rural
areas can
Bill;
The station backplane is the same ... The 4 big molex
connectors which connect the shelf are almost of not exactly
identical in either control shelf styles... Most conversion info
deals with changes at the backplane or on the repater door assy...not
the controller.. In most
I think you are referring to the repeater which will be 1 channel
normally... Program it to the nearest 12k5 step and warp the tcxo on
freq It should be able to net on freq... Only reason you need to
match steps would be in a multifreq or mobile as the step size would
be required to
Kieht;
For non production, amateur, and student use, Express PCB
and PCB Express offer free cad programs to do boards they support
internally. Launch ordering right inside,...simple layout tools..
Tough to beat for easy learning curve and one-off assy's.. A few days
turn to get them
Ralph;
Best case for nowit can be modified for 900 rx with
information available at this time.. even that is a lot of work
Many better donor radios to work with that are already in 900... Most
radios with 800 brick VCO's do not move well.. many will rx, but most
to none will
The secondary DC after capacitors in a normal astron ( using its
correct input voltage ) is about 26 vdc after filtering and across
the capacitors.. If you run a 220 astron at 120vac , the voltage
would be half or so, or ~13vdc. This is not enough overhead to
regulate but the regulator will
Gary;
I know the 120v versions are as you say, 120 only ( at least
every Astron non -switcher I ever worked on) , I just did not know
if the 220 versions may use a split primary transformer.. The 120
versions definitely do not allow for mod to 220.. :-)
Fortunately, many
Luke;
If you are not already a member, there is a yahoogroup
called ar902mhz which is dedicated to 900 conversion information..
There is also documentation in the Batlabs site on the subject of
900Maxtrac Conversion, proably here too at repeater-builder Many
repeaters have been
The commercial version of the KPC3+ has some very nice modem like
feature sets which make it look like basically a serial port over
rf... That firmware may be better suited for your application.
Doug
KD8B
At 06:57 PM 5/20/2007, you wrote:
I was wondering if anyone in the group has ever
The factory may email it if you ask nice...if not let me know and I
can provide a copy from my archives. I will see if I can PDF it if
the factory cannot send it...
especially if you are polite and say it is for ham radio
216-351-1755
Racom Products in Cleveland Ohio
(a long time ago in a
The manager of the operation bought it about a year ago to keep it
going, and moved it to a new location
Doug
KD8B
At 10:25 AM 5/22/2007, you wrote:
Doug Bade wrote:
The factory may email it if you ask nice...if not let me know and I
can provide a copy from my archives. I will see if I
We have some that might be available...
Contact me private if you wish...
Doug
KD8B
At 12:16 AM 6/7/2007, you wrote:
I am still in the market for a SEA ESP1000 repeater so I can beguin
the 222-225 MHz NBFM conversion project.
I would prefere one with the Reference oscillator, but it may not be
I used an external speaker on mine and it made a world of
difference.. the internal one really is pretty bad...
Doug
KD8B
At 03:33 PM 6/8/2007, you wrote:
A regular user of our linked repeater system has an ICOM IC-208H. He
frequently has trouble understanding transmissions, and we think
I would seriously look at the possibility of building an offsite data
center DR facility as it seems like it has the start for it assuming
fiber connectivity can be brought in.. You may be able to generate
some serious revenue to pay the rent so to speak.. A building
like this has some
Externally controlling a Mastr III is documented in the current
station service manual. It may be in some of the older LBI's. It is
not quite as easy as a Mastr II to hook up, but I would address the
freq programming first as that needs to work before the rest
matters... I was not able to move
. Also the last
thing I would think about is kluging an outboard controller to an M3
when is has most everything built in. Steve
Doug Bade wrote:
Externally controlling a Mastr III is documented in the current
station service manual. It may be in some of the older LBI's. It is
not quite
To add to this, the transmitter is dip switch so the rx is the
problem at this point
it looks like the tx will go wherever needed.
My tx module has modulation issues too but that is another matter...
Doug
KD8B
At 12:00 PM 6/21/2007, you wrote:
I just checked this am.. Mine do not
everything work OK in software. The pots inside
the module are for LF mod (CG tone, DCG, etc) and HF mod - higher end
audio frequencies. The DSP in the system module also can very much
affect transmit audio. Steve NU5D
Doug Bade wrote:
To add to this, the transmitter is dip switch so the rx
. Steve NU5D
Doug Bade wrote:
To add to this, the transmitter is dip switch so the rx is the
problem at this point
it looks like the tx will go wherever needed.
My tx module has modulation issues too but that is another matter...
Doug
KD8B
At 12:00 PM 6/21/2007, you
A TS64 is an encoder/decoder. A TP3200 is the tone panel...
Doug
At 01:12 PM 6/26/2007, you wrote:
I thought the TS-64 is a tone panel/ controller. We have added them
to a R-100 repeater to give them a group of users for a GMRS group
we had here at one time.
- Original Message -
You need to check the receiver board to see what band it is on as the
labels on the case may be totally inaccurate...
the receiver part number will have a letter combination in it to
determine the range.
NRF is 900 mhz
NRE is uhf
NRD is vhf
There are several bandsplits in VHF and
I think the idea is you want the legs of the
tower to extend below the concrete into mother
earth to keep lightning from arcing ( or trying
to) through the concrete on the bottom if it gets
a direct strike... Then add the appropriate
grounding rods outside the concrete and it will
not likely
I guess as long as you are spaced correctly it could be added
afterwards, but I would do it first to make life simplergetting
boring bits around the tower leg would be more annoying than it is
worth... If you have the tower up, deal with it but if you have a
choice :-)... just measure
Mike;
I have looked at it, here is the dilemma. The channels are
pre-programmed into the tx and rx decks. There are rotary channel
switches to select the channel( at least in the ones I have) . Valid
channel numbers are 1-400. 401 unlocks the vco. Both tx and rx react same.
Well at least if it is Flex system on a national carrier this is
probably true... Some of the older systems at 900 like ours, which is
POCSAG uses disciplined oscillators locked to the master which may or
may not be on exact freq as it IS set and stable but not by GPS
Freq error is
I would be quite surprised if you are NOT having desense with a Mastr
II and a 6 can notch only duplexer at 600 khz
Typically a 6 can reject only duplexer is not sufficient isolation at
600khz for 2 meters with a solid state PA.. Vertical separation or a
pass/reject duplexer will be
There was some notes I read somewhere that the channel steps on the
220 version was limited and in this country we could not access ALL
freq's on 15/20 khz band plans.. just some... I think I read it was
12k5or 10k0 or something like this, and channel stepped which did
not match all of our
--- In
mailto:Repeater-Builder%40yahoogroups.comRepeater-Builder@yahoogroups.com,
Jed Barton [EMAIL PROTECTED] wrote:
That souds like a plan
Yeah 220 stuff is getting very very hard to find for sure On Sep 26,
2007, at 2:55 PM, Doug Bade wrote:
There was some notes I read somewhere
I should correct that, the copper coils on the rx side are
separated, the tx exciter is the double assy.. Same problem however
was on each, getting them in to range with sufficient tuning and
energy to still pass the correct multiplier through...
I ended up checking the
While I have never seen or heard of a case, it may be possible..
However, it is most likely not the case. I suspect insufficient drive
from the oscillator chain through to the mixer.. The copper helical
bandpass filter at the end of the L.O. chain will not tune without
mods, getting them into
Adam;
I would look at the caps in the 10v regulator area and make
sure they are modern newer capacitors, the other thing is that
there was a mod on some IFAS boards that had a capacitor in the Audio
transformer feedback loop that was changed from a cap to a resistor
or from a resistor
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