Friends,
I have a technical puzzle to solve and I'm looking for suggestions.
I have a new and unused Narda 15172 L-Band Transceiver. It is a high
stability mil-spec device that can upconvert from 70 MHz to L-band and
downconvert from L-band to 70 Mhz. I plan to use it as a 1296 transverter
for EME.
I was told that no user manual was ever written but I have the pinout for
power and control interface. The device can be easily powered. But the
device must be configured and TX enabled via its RS-485 interface and a
computer.
I have RS-232 to RS-485 converters. I also have a 4 channel logic
analyzer. I'm sure the transceiver is healthy - I just don't know how to
communicate with it.
Does anyone have experience with Narda device communication protocols? Any
suggestions on how to approach solving this puzzle?
73 - Paul - W2HRO
Tom, the voltage drop depends entirely on the winding resistance for both
the primary and secondary. With a capacitor type filter you can expect the
peak current to be about 5 times the average current.
The drop is ohms law, I times R. In your case about 1.25 times R for the
secondary. The drop in the primary will be similar so a ball park E drop
would be the secondary drop X 2 total.
In addition to this, there will be a voltage drop associated with the
primary resistance in the house wiring and service entrance. That can vary
widely and is not easy to measure. I simple voltmeter measurement is misleading
since it will show the rms voltage and it is the peak voltage that
determines the power supply regulation. Not much one can do about it so we take
what we get.
Like a lot of issues, this one is more complex than you first think.
73,
Gerald K5GW
In a message dated 1/29/2016 2:56:34 P.M. Central Standard Time,
loeblt(a)gmail.com writes:
I am assembling an amplifier with a single 4cx250B. I am shooting for
plate voltage either side of about 2KV DC. I have a Saratoga Industries
potted transformer with a 1400VAC secondary winding rated at 300 ma.
that weighs around 17 lbs. Looks mil. spec. mfg. I figure with a bridge
and about 10 MFD capacitor input filter I should able to approach 2
KVDC. Anyone with experience building power supplies who can tell me if
this transformer could deliver 0.25A peak plate current without the
voltage sagging too much?
Tom
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hi
i was lucky to get used 15 bit (32767steps)single turn absolute
decoder(sick-stegmann) with serial ssi output for 50eur per each.if
anyone needs ,i can try to get some more
vy 73 per dk7lj
Yes, if you are looking on the WSJT spectrum display you need to +/-MDS
to 1296.000.
On USB the signal will appear at DF=0 when you move down a further 1270Hz.
So if MDS was +2270 you listen on 1296.001 on USB to see the trace
appearing at 0 on the
JT frequency offset scale.
73'
Keith G4FUF/XV4F
Ed, remember that your echo comes back at 1296.070 at your qth only. It
will be different in Europe and other places.
This is irrelevant unless you are posting a calling frequency on one of the
eme reflectors. In that case you would post your actual transmitting
frequency and let everyone else figure out where to listen for you and set their
transmit frequency so you will hear them.
For such a simple concept the details are quite complex!
73,
Gerald K5GW
In a message dated 1/27/2016 2:10:51 P.M. Central Standard Time,
kl7uw(a)acsalaska.net writes:
Don,
Let's consider the case where you call CQ (you have no idea who will
reply so MDS is unknown):
I do it differently (or backwards). I look up my Doppler offset on
WSJT Astronomical Data window and adjust my XIT to offset that from
my calling frequency. Then I just receive at my calling frequency.
eg: Lets say I want to CQ on 1296.070 and my Doppler is +2.300
KHz. I set my transmit into Split and enter 1296.070-2.3
=1296.067.700 for Tx. My echo will come back at 1296.070. I don't
actually use XIT as adjusting it to -2300Hz will take too much knob
twisting.
Running JT65 in echo-mode it seems that the normal sw delay going
into Tx is eliminated and sw transmits immediately. That should not
be a problem when using a sequencer. My sequencer adds 0.3 second
delay which should not cover up a 2.5 second delayed echo. But I see
no display of my signal or any measurements of level. Soooo???
I'm making QSO's so measuring my own echo is not that important.
73, Ed
At 10:06 AM 1/27/2016, Don Hawbaker wrote:
>I have had good success with echo mode. You have to remember to go
>into setup and tell WSJT what the SDS is. Then you have to offset
>your receive frequency by the SDS so that your receiver is tuned to
>your downlink frequency. Once you do that, you will probably start
>seeing yourself on the waterfall. It won't work if you don't tell
>WSJT what you offset is. Not sure how critical it is. Maybe couple
>of hundred hertz. Someone else probably knows. I try to stay
>within 100 hertz. I am still very new to this mode. Transmit at
>070.000 with an SDS of 1000, put the receiver at 071.000, and tell
>WJST setup you are plus 1000.
>
>Might have come difficulty if your sequencer is extremely long and
>your receiver stays off line. This test is like just a couple of
>seconds on and off. Transmit, pause two seconds ? for return trip,
>start receiver.
>
>Sent from my iPad
>
> > On Jan 27, 2016, at 1:11 PM, Edward R Cole <kl7uw(a)acsalaska.net> wrote:
> >
> > As one who was confused by Al's treatise on Doppler - lots of new
> > undefined variable names.
> > OK SDS= my Doppler and MDS= mutual Doppler.
> >
> > Correcting for my Doppler is easy if I have WSJT running as it is
> > displayed. I use Split VFO vs XIT as it seems easier to just key in
> > the value of SDS vs twisting the XIT knob a few hundred turns (I use
> > Split on 2m-eme when running MAP65). Subtracting a positive SDS or
> > adding a negative SDS lets me correct my Tx so my echo will be
> > received on my dial frequency aka 070 or whatever I chose (have I got
> > that right?).
> >
> > MDS is only usable if I know the DX stations call sign and enter it
> > on WSJT. And that is only good if the grid square is included. If
> > calling CQ I know nothing about MDS, so best to compensate my Tx and
> > look +/- my dial (MDS=0). Tuning for calling stations is pretty easy
> > as many are even audible if I wear my headphones...truly weak ones
> > are harder to find. They should perfect the process of choosing to
> > call the CQ stations self echo frequency to help them be found.
> >
> > I have yet to hear my own echo, strange as that seems. Maybe my
> > hearing is so bad. I should hear it as I am getting nice signal
> > reports on WSJT which would be audible levels. The echo-mode of JT65
> > has never worked for me...only thing it accomplishes is blowing up
> > preamps...so i avoid using it.
> >
> > Checking Doppler with ON0EME is a good suggestion - also to quick
> > check Rx performance.
> >
> > I use PLL on all freq 432 and up (not QRV 432-eme).
> >
> > 73, Ed - KL7UW
> > BTW we have it easy. Try finding the downlink frequency of a
> > spacecraft transiting the unknown gravity field of a planet traveling
> > at unknown velocity at an unknown position in an unknown direction
> > operating with a VCO at unknown internal temp thus unknown
> > freq, Then trying to lock the spacecraft's VCO by sweeping your
> > uplink transmitter and waiting to hear the effect for a long RTLT (in
> > hours). That's what I used to do working at Goldstone back in
> pre-history ;-)
> >
> > At 04:41 AM 1/27/2016, charlie(a)sucklingfamily.free-online.co.uk wrote:
> >> Hi Gerald
> >>
> >> As far as I know no software corrects for the changing Doppler due to
> >> time being later between signal leaving you and then returning.
> >>
> >> With the new routines that Joe put into WSJT-X, the accuracy of the
> >> calculations is now extremely high - on 10GHz for example we have
observed
> >> that accuracy is within a few Hz. The biggest errors are probably
down to
> >> stations' locations not being (usually) at exact centres of the grid
> >> locators inputted to the program.
> >>
> >> Re having mutual doppler being displayed - I found this quite useful
to
> >> have, when operating CW (and not using Doppler correction at that
time)
> >> and knowing where to look for the other station.
> >>
> >> 73
> >>
> >> Charlie
> >>
> >>
> >>
> >>> The signal DOES change frequency going up! The same relative motions
are
> >>> present in both directions and add together to determine the total
self
> >>> doppler.
> >>>
> >>> As a matter of fact, the software we use only calculates the one way
> >>> frequency shift and then multiplies it by two to derive the total
self
> >>> doppler.
> >>> It is done this way because both the up and down numbers are the
same.
> >>> Actually they are slightly different because the time is slightly
> >>> different but
> >>> small enough difference to ignore.
> >>>
> >>> Perhaps the more recent software takes this into account. Does anyone
> >>> know?
> >>>
> >>> 73,
> >>> Gerald K5GW
> >>>
> >>>
> >>>
> >>>
> >>>
> >>> In a message dated 1/27/2016 6:34:47 A.M. Central Standard Time,
> >>> donhawbaker(a)outlook.com writes:
> >>>
> >>> Correction, in second paragraph, figure out his SDS, not MDS.
> >>>
> >>> Sent from my iPad
> >>>
> >>> On Jan 27, 2016, at 7:25 AM, Don Hawbaker <_donhawbaker(a)outlook.com_
> >>> (mailto:donhawbaker@outlook.com) > wrote:
> >>>
> >>>
> >>>
> >>>
> >>> I too have been struggling and continue to struggle with Al's
> paper. Part
> >>> of the problem has to do with my transceiver. Al is apparently
using a
> >>> TX-2000. I have never used one. His example seems to indicate
that he
> >>> can
> >>> set transmit frequency by using the RIT. I thought the R stood for
> >>> receiver -
> >>> incremental tuning. In my FT-817, I have to set transmit frequency
> >>> first,
> >>> and then turn on the clarifier to set the receive frequency.
> >>>
> >>>
> >>> So I have been blindly following his conclusion until I can
understand
> >>> the
> >>> math. If a station is calling CQ on 070 and the MDS is 100, I
expect to
> >>> receive him on 070.100. I think Al says I need to put my self echo
> >>> signal
> >>> on the frequency where I receive him if I want my signal at his
end to
> >>> fall
> >>> on his echo. So if my SDS is 2000, then I need to transmit on
070.100
> >>> minus my SDS, or 068.100. If I do that, I am supposed to be
received at
> >>> his end
> >>> on his own echo frequency which is where Al recommends the calling
> >>> operator listen. I have not completely worked out what that
frequency
> >>> would be.
> >>> By knowing the SDS and the MDS, you could figure out his MDS, but
> >>> apparently that is not needed since it is not posted in any of the
> >>> displayed data.
> >>>
> >>>
> >>> So I put my transmitter on 068.100, then I push the clarifier
button and
> >>> set my receive frequency to 070.100. I should receive him and he
should
> >>> receive me on his echo frequency.
> >>>
> >>>
> >>> Have not been able to work though the math yet. Project is on going
-
> >>> today!
> >>>
> >>>
> >>> Am I doing this wrong? I have not yet addressed the other
> scenarios that
> >>> Al addresses, since the first example is most common.
> >>>
> >>>
> >>> The math will be a little different at your end since in Europe, the
> >>> Doppler would be negative since the moon is moving toward the US.
> >>>
> >>>
> >>> Feedback is welcome. I am new at this. 73s
> >>>
> >>> Sent from my iPad
> >>>
> >>> On Jan 26, 2016, at 6:26 PM, Juan Antonio Fernandez
<_ea4cyq(a)gmail.com_
> >>> (mailto:ea4cyq@gmail.com) > wrote:
> >>>
> >>>
> >>>
> >>>
> >>>
> >>> Hello All,
> >>> Reading EME 2014 conference by K2UYH over doppler shift, I
> have not clear
> >>> what is the equation of Mutual Doppler.
> >>> I understand that WSJT in its screen of astronomical data shows Self
> >>> doppler and DX doppler. It seems to be that DX doppler is actually
> >>> Mutual
> >>> doppler.
> >>> So, I need to make clear if WSJT astronomical data window shows DX
> >>> doppler
> >>> or Mutual doppler. And what is the relation between Mutual doppler,
Self
> >>> doppler and DX doppler.
> >>> Thanks in advance.
> >>> EA4CYQ, Juan Antonio
> >>>
> >>>
> >>>
> >>> _______________________________________________
> >>> Moon-Net posting and subscription instructions are at
> >>> http://www.nlsa.com/nets/moon-net-help.html
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>> _______________________________________________
> >>> Moon-Net posting and subscription instructions are at
> >>> http://www.nlsa.com/nets/moon-net-help.html
> >>>
> >>>
> >>>
> >>>
> >>>
> >>> _______________________________________________
> >>> Moon-Net posting and subscription instructions are at
> >>> http://www.nlsa.com/nets/moon-net-help.html
> >>>
> >>>
> >>>
> >>> _______________________________________________
> >>> Moon-Net posting and subscription instructions are at
> >>> http://www.nlsa.com/nets/moon-net-help.html
> >>>
> >>>
> >>>
> >>> _______________________________________________
> >>> Moon-Net posting and subscription instructions are at
> >>> http://www.nlsa.com/nets/moon-net-help.html
> >>>
> >>>
> >>> _______________________________________________
> >>> Moon-Net posting and subscription instructions are at
> >>> http://www.nlsa.com/nets/moon-net-help.html
> >>
> >>
> >> _______________________________________________
> >> Moon-Net posting and subscription instructions are at
> >> http://www.nlsa.com/nets/moon-net-help.html
> >
> > 73, Ed - KL7UW
> > http://www.kl7uw.com
> > "Kits made by KL7UW"
> > Dubus Mag business:
> > dubususa(a)gmail.com
> >
> > _______________________________________________
> > Moon-Net posting and subscription instructions are at
> http://www.nlsa.com/nets/moon-net-help.html
> >
73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
dubususa(a)gmail.com
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Good morning from VK
Would it not be simpler to specify all frequencies as "on the moon"
frequencies?
ie each transmitting station uses their own Doppler offset "to the moon" to
adjust their Tx frequency for a specified frequency "on the moon" and then
each receiving station merely needs to adjust that frequency for their own
Doppler. As each offset and corresponding adjustment can be positive or
negative depending on each station's position on earth relative to the
moon, adjusting so that each target station receives on the same frequency
is actually impossible. By standardising on the "on-moon" frequency, much
confusion can be avoided.
This approach has been mentioned many times before but not in this current
discussion, unless I'm mistaken.
73
Andrew
VK1DA
> Message: 2
> Date: Wed, 27 Jan 2016 15:42:34 -0500
> From: TexasRF(a)aol.com <javascript:;>
> Subject: Re: [Moon-Net] Doppler effect
> To: kl7uw(a)acsalaska.net <javascript:;>, donhawbaker(a)outlook.com
> <javascript:;>
> Cc: moon-net(a)mailman.pe1itr.com <javascript:;>
> Message-ID: <1f290d.4a06813a.43da85b9(a)aol.com <javascript:;>>
> Content-Type: text/plain; charset="us-ascii"
>
> Ed, remember that your echo comes back at 1296.070 at your qth only. It
> will be different in Europe and other places.
>
> This is irrelevant unless you are posting a calling frequency on one of the
> eme reflectors. In that case you would post your actual transmitting
> frequency and let everyone else figure out where to listen for you and
> set their
> transmit frequency so you will hear them.
>
> For such a simple concept the details are quite complex!
>
> 73,
> Gerald K5GW
>
>
>
>
>
--
Andrew VK1DA
Sent from Gmail Mobile
Hi all.......
If anybody have for sale a 2500C bird 43 slug, let me Know AT my personnal
adress mail.....
F4ezj16(a)gmail.com
Thanks un advance
Stef F4ezj
Hi All,
You can see the power point I presented at the MUD on external mixers for Spectrum analyzers. Let me know if you have any questions. http://www.nitehawk.com/k6jey/harmonic_mixers.pptx Doug K6JEY
-
Dr.Doug Millar EdD.
K6JEY
drzarkof56(a)yahoo.com
562 810 3989 cell/text
