It is currently Mon Nov 20, 2017 5:21 pm

Click the link below to visit the site sponsor

The Ham Radio Shop




Post new topic Reply to topic  [ 5 posts ] 
 Wanted, frequency standard, West Midlands 
Advanced Member

Joined: Sun Jan 24, 2016 1:23 pm
Posts: 129
Location: Black Country
Feedback: 1 (100%)
Reply with quote
Post Wanted, frequency standard, West Midlands
I have 3 counters, and with an input signal they all give different results. Not a great deal, but enough to think my counters need calibrating.
I usually stuff 28.000 as a known signal, but that of course is reliying on the fact (?) that my TS950 is accurate.
Has anybody in west Mids got one I could borrow, or visit and get at least one of these aligned? Alternatively anybody know of somebosy who does it foar a living, for a sensible fee, ie "I'm not made of money" rate?


Thu Oct 05, 2017 11:34 pm
Profile Send private message

 Wanted, frequency standard, West Midlands 
Contributor 2017
User avatar

Joined: Sat Jan 23, 2016 7:24 am
Posts: 1109
Location: Blackpool. IO83lu
Feedback: 4 (100%)
Reply with quote
Post Re: Wanted, frequency standard, West Midlands
Do any of your frequency counters have an external clock input? If so, consider a GPS governed clock. You can buy them as a kit.. not too expensive, and worth buying. You'll not get much more accurate than that.

If none of them do, then it is indeed a case of calibrating them, and again, a GPS governed 10MHz clock will give you a reference source.


Something that's worth investing in if you ask me, as even after getting someone to calibrate it... how long before you start to wonder about it's accuracy again?


What are you using them for? Are they used as lab test equipment, or just to check the accuracy of your radios? If the latter... you're probably better off zero beating against a time/standard signal like WWV or even a broadcast station with known accuracy. Radio China International are usually strong and seem to be accurate. Just remember, the higher the frequency you zero beat against, the more accurate it will be.

That will get you very close unless you also want to ensure a radio is precisely on frequency on VHF/UHF... in which case, yes... you'll need an accurate piece of test gear.

_________________
https://www.qrz.com/db/G0SLV


Fri Oct 06, 2017 6:27 am
Profile Send private message

 Wanted, frequency standard, West Midlands 
Contributor 2017
User avatar

Joined: Mon Aug 11, 2014 4:56 pm
Posts: 288
Location: Southampton
Feedback: 3 (100%)
Reply with quote
Post Re: Wanted, frequency standard, West Midlands
I would second the 10 MHz clock idea. They can be had for about £100.

We had a particularly good one at the last place I worked at and used it to calibrate a whole raft of equipment and to provide a reference signal to a lot of the test kit while in use.

_________________
Andy


Fri Nov 10, 2017 11:07 pm
Profile Send private message

 Wanted, frequency standard, West Midlands 
Advanced Member
User avatar

Joined: Mon Nov 11, 2013 10:41 pm
Posts: 1033
Location: Walsall IO82XN
Feedback: 2 (100%)
Reply with quote
Post Re: Wanted, frequency standard, West Midlands
Spectrum Communications sell a kit for a phase locked off-air standard. Prices start from £61.

http://www.spectrumcomms.co.uk/Test.htm (Towards the bottom of the page).

If you keep an eye open on ebay you'll find from time to time Quartzlock off-air standards come up for grabs...

_________________
"Morse Code, no magic involved, just practise..." :thumbsup:


Tue Nov 14, 2017 8:37 pm
Profile Send private message

 Wanted, frequency standard, West Midlands 
Contributor 2017
User avatar

Joined: Sat Jan 23, 2016 7:24 am
Posts: 1109
Location: Blackpool. IO83lu
Feedback: 4 (100%)
Reply with quote
Post Re: Wanted, frequency standard, West Midlands
G0KZZ wrote:
Spectrum Communications sell a kit for a phase locked off-air standard. Prices start from £61.

http://www.spectrumcomms.co.uk/Test.htm (Towards the bottom of the page).

If you keep an eye open on ebay you'll find from time to time Quartzlock off-air standards come up for grabs...



Radio 4 is all over the place these days. Have you ever tried to zero beat it with SSB? Warbles more than a drunken soprano.

_________________
https://www.qrz.com/db/G0SLV


Thu Nov 16, 2017 5:44 am
Profile Send private message
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 5 posts ] 


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
Powered by phpBB © phpBB Group.
Designed by Vjacheslav Trushkin for Free Forums/DivisionCore.