straight - Page 1
Forum section: electronics / testgear

author: GEuser
author_rank: Frequent Contributor
timestamp: August 19, 2014, 02:38:18 am
content: Q

author: radhaz
author_rank: Regular Contributor
timestamp: August 19, 2014, 02:54:04 am
content: What an age we live in, when a hobbyist can acquire such test equipment.

author: nctnico
author_rank: Super Contributor
timestamp: August 19, 2014, 04:21:56 pm
content: Interesting!What would be a nice test is to sweep the frequency to see how flat (or not) the sensitivity is.

author: nctnico
author_rank: Super Contributor
timestamp: August 20, 2014, 10:12:21 am
content: I was more interested in what the sensitivity is at 2.4GHz (the maximum frequency).

author: nctnico
author_rank: Super Contributor
timestamp: August 20, 2014, 01:01:50 pm
content: I couldn't resistI bought one

author: nctnico
author_rank: Super Contributor
timestamp: August 27, 2014, 01:04:24 pm
content: I just received mine and did some tests on the sensitivity (voltages in RMS) according to my RF generator:100MHz 70mV (-10dBm)2GHz 70mV (-10dBm)2.5GHz 130mV (-4.7dBm)Over 2.5GHz the sensitivity falls off sharply. There is also between 1 and 2dB loss in the cable I used at 2.5GHz so the sensitivity at high frequencies is actually slightly better than shown above.

author: Teledog
author_rank: Regular Contributor
timestamp: March 10, 2015, 05:16:43 am
content: Got one myself..after a fair warm up found it drifted.Replaced the (crappy) thermal Xtal setup with an OCXO....and calibrated THAT with a GPSDO ('cause I'm anal?!)Emailed the mfr. for a schematic & they were very good about emailing the osc. section back to me

author: Marc_Und
author_rank: Newbie
timestamp: May 07, 2015, 07:25:30 pm
content: QuoteAny chance you can supply some photos, and instructions on how you did that, as I interested in attempting a similar modification on my VC3165.Or on how to adjust its calibration....I have just got myself a 10 MHz Rubidium Freq Standard unit (FE-5680A), and it is showing that my Freq. Counter's calibration is out slightly (i.e. it is reading 10.000020 MHz, instead of 10.000000 MHz), and I would like to improve it.Thanks.

author: pascal_sweden
author_rank: Super Contributor
timestamp: May 08, 2015, 12:11:53 am
content: Quote from: radhaz on August 19, 2014, 02:54:04 amWhat are the 2 big units underneath the Victor? This seems very expensive equipment!So you have these 2 professional units, and still you need a Victor?Did you loan them, or was the photo taken at your company? =)Is it possible that this Victor VC3165 is also rebranded under Velleman DVM13MFC2?http://www.velleman.eu/products/view/?country=es&lang=en&id=366114There are even some unbranded ones on Ebay, so you can give it your own namehttp://www.benl.ebay.be/itm/VC3165-Radio-Frequency-Counter-RF-Meter-0-01Hz-2-4GHz-Victor-Professional-Tester-/181336910881?hash=item2a3885ac21I read that it performs very well on high frequencies, but not so good on low frequencies.Did you also make the same findings during your tests?

author: pascal_sweden
author_rank: Super Contributor
timestamp: May 08, 2015, 07:42:25 am
content: Quote from: Teledog on March 10, 2015, 05:16:43 amWhich company is the original manufacturer? Is it really Victor? Because these units are OEM.Maybe you can suggest your design improvement to them, and together make a better frequency meter. They could give you some "Victor" company shares in turn

author: nctnico
author_rank: Super Contributor
timestamp: May 10, 2015, 03:43:05 pm
content: Quote from: Teledog on March 10, 2015, 05:16:43 amPlease share how to do this modification!

author: Marc_Und
author_rank: Newbie
timestamp: May 17, 2015, 11:13:33 pm
content: Does anyone know what the missing components on the left hand-side of the main board, were meant to do?Would we get extra functions/channels if we fitted the missing components??

author: Electro Fan
author_rank: Super Contributor
timestamp: May 18, 2015, 06:18:37 am
content: Quote from: pascal_sweden on May 08, 2015, 12:11:53 amNice looking gear - looks like these models:Wandel Goltermann SPM-19http://www.ebay.com/itm/Wandel-Goltermann-SPM-19-Selective-Level-Meter-Options-BN-853-02-BN-829-00-08-/231561910558?pt=LH_DefaultDomain_0&hash=item35ea2a591eWandel-Goltermann PS-19http://www.ebay.com/itm/Wandel-Goltermann-Lot-of-2-PS-19-GENERATORS-W-G-PS19-Parts-Repair-Units-/141367499125?pt=LH_DefaultDomain_0&hash=item20ea28d975

author: MisterBiscuit
author_rank: Unknown
timestamp: July 18, 2015, 05:33:51 pm
content: Quote from: Marc_Und on May 07, 2015, 07:25:30 pm+1@Teledog, can you post the information that you have? I'm interested in the details around the oscillator circuit to wire in a more accurate oscillator.

author: Datman
author_rank: Regular Contributor
timestamp: April 28, 2017, 08:43:27 am
content: If someone is still searching for the schematic, here it is:https://www.google.it/search?q=vc3165+schematic&num=20&tbm=ischhttp://vrtp.ru/index.php?showtopic=24461https://www.electronicspoint.com/attachments/vc3165-jpg.5019/It is not very clear, but understandable.