Reply To: OM0OVR

Home Forums CQ HAMRADIO forum Very short waves OM0OVR Reply To: OM0OVR

#13480
OM1ATT
Participant

To OM0XA: more about the device, which is in the southwest corner of the same room, ATC is unlucky, that it is on the same floor and in the same building as OM0OVR…. those cavities in the ATC outside the cabinets are just to eliminate problems with the OM0OVR, today, instead of them, an interdigital filter works on one of the cabinets

To OM8ARK: when you look here http://www.om8aq.sk/texty/Trusalova10_11.htm, then you will see Hungarian “groats” in full glory when exploring its properties. Although we didn't use a vector analyzer, it can also be determined with a spectrum analyzer, whether it is usable at all…..IT IS NOT. The joke is in that, that this duplexer has a duplex distance 600 kHz very small dimensions and therefore small Q cavities. Apparently it was intended for greater duplex spacing, I type it on base stations with distance 4.5 MHz. From the three Hungarian hollows you wring suppression with misery 75 dB, same design with 8″ cavity (200 mm internal diameter) can over 125 dB at through attenuation 1 dB (is needed on PI3VNL). With such a duplexer, it is rather a problem to measure it at all, this machine can do it, for example http://www.rohde-schwarz.cz/product/ZVA8%20%282-Port%29.html , but only in the version with direct access to the receiver. Unfortunately, physics cannot be fooled.

If I vaguely remember, so OM0OVR is the original OK0R, OM0OVU also has a similar duplexer and it is not so bad. I would rather look for a fault in the electronics or cabling, or whether there is a reduction in effective sensitivity due to other devices in the building.