Posts by PA3FYM

    Didn't want to start a new topic/thread, so I post it here.


    Repaired/refurbished/aligned/<whatever> my old FT-780R a few weeks ago to serve as portable QO-100 transceiver ('Nachsetzer'). To determine if all the alignment worked out, I used my (almost forgotten) electronic guitar tuner while listening to the CW beacon ; -) 432.549.12 MHz (USB) delivers a 880 Hz (A5) tone! (click on image to enlarge)

    Friday is my free day, so time to hobby! As guinea pig #2 built the 'Radioclub 't Gooi' (PI4RCG) MMIC amplifier however, deviated a little from the original design (didn't had all the parts, so the junkbox is always my best friend ; -) and used two TQP3M9009's as driver MMIC's (original design uses two SBB3089z's). My MMICs have more gain and hopefully all will be stable! Amp has to be tested of course.

    Below a pic of WIP (Work In Progress) (click to enlarge)


    No idea, I (only) use the cheapest Chinese LNB's (ca. U$ 3,-), modify them (for GPS lock) and make QSO's ; -) George ... we made QSO's (two times) and your photons (not really . . they were relayed through the transponder ... but anyway) entered my 3 U$ LNB and 1) I could hear you and .. 2) rock stable ; -)

    Mike, look at a thread on this labyrinth .. eh forum from (I believe) February , there was an inventarisation.


    Notice that the amateur service and the amateur satellite service are two seperate services (see ITU-RR art. 1.56 and art. 1.57). So it is administratively not incorrect to treat the two services differently. Iirc most countries allocate(d) 2320 - 2400 to the amateur service (art 1.56) and 2400 - 2450 to the amateur satellite service (art 1.57).


    E.g. here in The Netherlands Full licensees may use 2400 - 2450 MHz, but only for the amateur satellite service (i.e. pointing your dish to the sky) and not for amateur service usage ('terrestrial', i.e. pointing your dish to the horizon).

    VU3BCN The skew is best adjusted for minimum signal on the wrong polarization (so for DATV switch to H and null the narrow band transponder). Polarization discrimination between H and V will be in the order of >20 dB or so, used in (broadcast) transponders which transmit on the same frequencies but with different polarizations to maximize capacity.


    Although QO-100 hasn't overlapping transponder frequencies (and thus no interference from the other polarization) the effect of having the -super- right skew will be minimal (unless it's the opposite polarization ; -)

    G0TKZ Triax dishes for our region have an intrinsic offset of 26 degr so that everybody is able to point his/her dish (at the camping site). So, if the dish is perpendicular (90 degr) compared to 'flat' ground the elevation angle is 26 degrees. That means that at your location -where you need 26.5 degrees elevation- the dish almost has to be perpendicular to the (flat!) ground.


    Take that as a starting point (don't look at the 'degree table' at the sides (because they -mostly- have two variants , depending on your lattitude) and then turn your dish to around 148 degr azimuth (somewhat more South compared to SSE). If all other equip ment is working properly you must be able to see something on Es'hail-2. Then it's a matter of refining and tweaking for the optimal signal strengths / SNR's. It helps when you are able to listen to the NB tpx and monitor the beacons.


    Bear in mind, the bigger the dish, the more precise the pointing/alignment (due to smaller opening angle(s).