Mike Hot switching a small DC current really does work in many cases. You generate micro-arcs at the contact surface which disrupt the oxide layer and promote a lower contact

Hello Unless someone says otherwise you might try this http://www.dl6nci.de/sma.htm David - G4RQI Get Outlook for iOS

I cured a few of mine by just operating them a few times Andy www.g4jnt.com

Been going through my sma relays and testing them on my primitive spectrum analyser has shown that I have quite a few lossy relay on TX as high as 4dB and quite a few showing around 1dB on RX side. I

There is a well know law of electronics that if you have a fiull set of spares for an item it is very unlikely to go wrong! During the rebuild of GB3KBQ, due to the generocity of individuals on this

Hello All, Look on Aliexpress for this . Very

https://rfshop.co.uk/feedthru-tusonix-compatible-8-32-unc-thread-1500pf-ft-1500 but postage is £6.. #8-32 UNC is for a 4.2 mm hole CPC have some that are 5.5mm #12-28 UNF Franco Rota has some 2.9mm

Hi Mike Try https://www.sv1afn.com/en/product-category-4/ 73 Keith

Anyone know of a source of small bolt in ir solder in feed through capacitors. 3-4mm diameter max as I want to externalize some control pins on two transverters I have. All the ones Ive seen on

Hi Andy, thanks for your comment, it is the Panasonic AQV252G as you say quite chunky. Ensures you don't need to use an external device to beef up the connection to external relays! 73 Clive GW0PPO

I'd guess a plane under 3000 m somewhere between Newton Stewart and Cumnock, travelling east-west. If it was very high, it might be outside your antenna lobes, and if it was travelling at a

Just looked-up the opto used in that. It's quite a chunky beast, capable of switching 60V at 2.5A. Not cheap either. Over £5 each Andy www.g4jnt.com

Don't need a manual. you can work it out from the diagram. Taking the connections as shown in your diagram, starting from the top left: Pins 1/2 , connect to your receiver either headphone socket or

Hi folks, long shot I know but here are some very knowledgable people on here. I want to resurrect a computer/rig interface. I have reverse engineered the schematic for it but I have no info on

Many thanks Neil I’m going to see if I can look back to that time period ans see what planes were about. Quite a Doppler shift on it as well Mike -- Mike GD6ICR IO74PF73TW

Typically they have about 50 dB gain in the LNB, but much of that is at the IF frequency. I have seen both single and dual stages before the mixer. And a GaAs FET as an active mixer is also common.

Thanks Kent. How much gain do you get from the LNA?

Most are in the .5-1 dB NF range. Certainly a lot of specifications out there from the marketing department vs the engineering dept. Yes, quite often you can cut power to the LO and run a jumper

Could someone please give me an estimate of the noise figure and gain that can be expected from the amp in a domestic LNB? And can one easily separate the LNA from the rest of the LNB? I would like to

Definitely a plane Mike, meteor returns above 70cm are almost nonexistent.  You can verify by running Airscout software to see what planes are causing the reflections. If you calculate the rate of