I'm on the map ! (and GPS locked) ; -)
Posts by PA3FYM
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Looks good! Which mixer did you use?
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do1ctl Wow! I never got more than 2 mW out of my ADF4351-boards. With a SPF5189z module I got around 25 mW @1968 MHz which I inject into the HMC213.
But your frequency (1175 MHz) is significantly lower.
When the 147 mW are 'real' mWatts then a resistor pi-attenuation of 7 - 8 dB would suffice (perhaps integrate it with SMD resistors on the HMC-213 (board) itself.
No, unfortunately it is not possible to let the ADF4351 generate two frequencies simultaneously.
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I believe I have a recording somewhere, in which he tested and was calling 'Apollo' or something ... Hope I find it ..
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dj0abr Kurt, was that you on .559.5 a few minutes ago ?
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DH2VA If you can ask the precise settings (for each beacon), it may be more convenient to (re)calculate the individual uplink budget, or have an idea if one is 'on par'. (believing this is the incentive for DC2TH's question)
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Today it started at 1116 UTC, yesterday 1140 UTC.
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I haven't seen any .. other than perhaps a 'photo moment' (during a milestone) where people in white outfits posed. In the back a 'contraption' is visible. If this was the satellite itself, I don't know.
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ON4BCB: correct .. an experiment by a friend of mine confirmed this. But ... there was an issue with the purity of his 10 MHz itself, but the result was more than horrible.
To be investigated/continued ... -
I bought two of these (2.30 U$ each incl. shipping).
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DL5MGD Your QRZ.com email was bounced. What is your email?
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HB9RYZ Same setup here , no 'intuning' (read: harmful interference to other listeners/users) and always the right frequency for RX and TX.
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Yes ... and no ... if strongly desired there is an 'inband duplex' possibility where the 70cm frequencies are 5 MHz spaced, e.g. TX on 432.678 and RX on 437.678 MHz.
(afaik nobody uses that option)
Once you operate simplex you don't want to switch to duplex but that seems to be a 'religious' topic and I'm almost banned from Earth concerning my point of view ; -)
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PA0P (we 'know' each other from another forum .... ) Nice pictures .. but haven't heard you (yet) via QO-100 ? So... where are you .. ? ;; -)
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A TCXO is not sufficient to be 'on frequency' , lock the LNB to GPS.
Good alternatives to the 'magic' Octagons are Starcom or other LNB's.
To put it into another perspective .. I have never had a 'bad' PLL LNB
(locked to GPS). Octagon, Starcom, Inverto, Goobay, Pollin etc. All perform well when the reference is GPS stable and clean (free from jitter).
In other words, when you're into the GPS locked world, you don't encounter problems/issues others have (let that be a lesson ; -)
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Besides my own design transverter (for simplex use) I have a prototype CMO-transverter (because I was involved in the design and wrote the software for the microcontroller).
It works very well. All LO's (including PLL LNB LO) are locked to GPS (like in my design). Rene's design is based on my philosophy , abeit that his interpretation is
more professional because his professional business is broadcast (uWave) (video/audio)transmitters. So his component choice is much better than my 'Scooby Doo' built, has lower phase noise(s) and a (much) more efficient 2.4 GHz PA.
So what do you want to know more / precisely ?
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YU7RSX depends that your reference level is ... Key is 'what is the reference?' and (how I see it) that has to be determined (in due time).
There are several 'knobs' to tune ... the challenge is to dial them towards the most 'optimal' position. And from what I experienced from AMSAT-DL is that they are trying to do exactly this.
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YU7RSX There is an ITU-document about Es'hail-2 where ground station parameters are presented (as 'benchmark'). The challenge now is to tweak the parameters such that the (NB) transponder is 'on par' with these parameters (user requirements) and C/N. This means that (regrettably?) ground stations with too small RX down- or TX-uplink capabilities have a 'challenge' and have to adapt their settings to be 'on par' per user requirements. So stations with too much link budget have to back off, and stations with too low link budget have to 'back up'.
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Interesting ... here in The Netherlands publication of such a list, i.e. callsign in conjunction with NAR (Name, Address, Residence) [by a governmental agency] is not allowed anymore for privacy reasons.
I thought there was EU-privacy legislation last year, so what might be the reasoning in Germany that BNetzA publishes this list and AT (Agentschap Telecom, Netherlands) doesn't ?