VK Logger Ham Radio Forum Archive

I would like to know what kind of antennas they are going to use...

i2NDT Claudio

Hi Graham an Rex (an the others of course!),
give a look at this AN by minicircuits: http://www.minicircuits.com/app/AN60-064.pdf
many guys here in Italy and in France have reported failures of the PGAs due to their instability at "lower" frequencies.

best DX
de
i2NDT Claudio

hi!
I have 2 crystal filters I would like to use in a receiver, but I don't know their input/output impedance...

how can I measure it???

Thanks in advance

best 73
de
i2NDT Claudio

I don't know that SSB device...
BTW I remember I used a 1/4 lambda piece of coax cable (actually 1/4 lambda x VF of the coaxial cable) and 2 back-to-back diodes to replace relays in my VHF FM PA.

i2NDT Claudio

you can also try the "front-end protection device" described by K3PGP in 1977... http://www.k3pgp.org/432filter.htm : its isolation is said to be around 40dB. it can be scaled for other frequencies as well. it must be installed between the antenna change-over relay and the preamplifier. i2...

the guy who designed this antenna (KE4LH) has a new web-site: http://minigunantennas.com/ he has got also e VK distributor: http://minigunantennas.com/international_distributors.html check also: http://www.ebay.com.au/sch/i.html?_from=R40&_trksid=m570.l2736&_nkw=MINI-MAX+MM-40 this antenna l...

ty!
it looks really very interesting and, if I am not wrong, that B100 can work with a TX daughterboard.
but I am afraid it's too complicated for me!
the website is meant for professionals and not simple hams like me!!! hahaha

i2NDT Claudio

ty!
it looks really very interesting and, if I am not wrong, that B100 can work with a TX daughterboard.
but I am afraid it's too complicated for me!
the website is meant for professionals and not simple hams like me!!! hahaha

i2NDT Claudio

very interesting indeed!
can you describe also your "Ettus Resarch" receiver?

i2NDT Claudio

go here http://www.rfmicrowave.it/catalogue.php?lang=eng download "SECTION M" and go to pag. M14

Best 73
de
i2NDT Claudio

Check also this TX (RX avalable as well): http://www.lechner-cctv.de/video-radio-modules-5-8-ghz/vtx-5827-5-8-ghz-sendemodul-27dbm.164.389.en.html?mwdSID=6fms1l3a6qol0uabglff1fib62 and its brother for the American market: http://www.dpcav.com/xcart/product.php?productid=16558&cat=249&page=1 ...

Yes Adrian, but don't forget to add shipping charges and insurance: 85$ (US to Italy) plus custom duties...and moreover they can refuse to sell to me directly as they have a European representative.

i2NDT Claudio

Thanks Adam for the info! Actually I was already considering the Prologix interface not only because it is very convenient (USB connection) but also because, at the end, can be even cheaper than a card and cable, according to the prices I found on e-bay! I thought those old fashion equipment were ch...

Thanks Tim!
Now have to find a cheap card...

i2NDT Claudio

I have just bought an old HP 8569 Spectrum Analyzer which is equipped with an IEEE 488/GPIB interface. I would like to interface it to my PC to acquire the images, so I am looking for a freeware "Plotter Emulator" software or a cheap share-ware one: the SA has already drained my "liqu...

Tnx Adam!
Well mine is a 134-23. I wanted to use it as the reference OCXO for my portable 5.7 GHz transverter...but I am a little bit concerned now!!! In fact I am going to carry it up to the hills in my car...which is not exactly a Rolls Royce!!! hahaha

i2NDT Claudio

I have just received the Isotemp OCXO I ordered from an ebay seller.
It is working...but when I shake it I can clearly hear and feel that something is moving inside the metal box!!!
Is it normal??? It seems quite strange to me...

Best 73
de
i2NDT Claudio

This should be the "notorious" Cyprus radar: http://maps.google.it/maps?q=cyprus&hl=it&ll=34.958787,34.083495&spn=0.002585,0.005284&sll=41.442726,12.392578&sspn=19.348581,43.286133&vpsrc=6&t=h&z=18 It used to interfere my 30 metres QRSS grabber in the past.....

Thermotweezers?
Something like this one? http://www.chipdip.ru/en/video.aspx?vid=ID000289114

I have just a limited experience in soldering SMD comp. I managed with my old Weller (WECP 50 Watts) to solder 1206 comps...but those 0805... I went downtown to a Weller dealer shop and discovered that my tip is the smallest available for that model. Smaller tips come with new models whose prices ar...