Hi Bob, At the start of the Covid-19 lockdown we stopped making products that took a lot of workshop assembly. The HF Preselector was one of the cancelled products. We don't have a US distributor as w

Hi Paul, It sounds like you have a bad shield connection on one or more of your coax cables. This may be caused by the coax connector not being screwed up tightly. When that happens the coax cable act

We try to give as much support to our customers as we can but this takes it to a whole new level! Regards, Chris

Hi Martin, We don't have a separate price list as all our products are displayed on our web site: http://www.crosscountrywireless.net/ If the web page for an item has a PayPal button then it is in reg

OK I'll build another batch of the Mains Filter next week. I stopped making quite a few products due to the Covid-19 lockdown as at the time it was uncertain if I could travel to the workshop. I'll ad

Very interesting Ray. Up until the Covid-19 lockdown we used to manufacture a Mains Filter that combined an IEC mains filter with a ferrite toroid to provide very high suppression of conducted HF RF i

Built into the Loop Antenna Amplifier + is a common mode choke on the co-ax output to isolate the amplifier and loop from any RF picked up by the coax shield or noise coming from the receiver ground.

Hi David, I've tested the 1:1 transformer on the 160m band (1.810 - 2000 kHz) with barely measureable loss. I agree that the toroid will have too low a u for the 2200 and 430m bands. The toroid is in

I just want to raise a point about using the Loop Antenna Amplifier + with a variable supply. It will be possible to reduce the gain by reducing the voltage applied to the amplifier. The reduction in

Hi Tom, I've not tried the Loop Antenna Amplifier + with a variable power supply so I'm not sure how much gain variation you would get. It's now on the list of things to do next week. Regards, Chris

Following the publication of my recent article on loop counterpoises for low noise vertical antennas in the RSGB RadCom magazine, I've had a lot of feedback from RSGB members trying the design. One qu

No it's not a negative feature. All SDR receivers such as the SDRPlay receiver you are using have a fixed maximum limit that the analog to digital converter can process. The RF gain control is used to

That's a good point. I've already sourced a roll of 2mm galvanised wire online so I'll run some comparison tests when it arrives. Regards, Chris

Hi Paul, I know from discussions between us that you are trying to emulate the galvanised wire loop that Mike Ladd uses with a Loop Antenna Amplifier + to great effect for his SDRPlay videos and sampl

I've just got back from holiday so I can answer questions more easily rather than relying on a very dodgy internet connection. Answers to recent questions... 1) Can it be used with a 40m vertical? Yes

It's a combination of a few factors. I found that using two or more loop counterpoises isolated from the ground greatly reduced capacitive coupling to nearby electrical systems compared to radials and

Disconnecting the existing ground system would work OK. Regards, Chris

The antenna and loop counterpoises are isolated from ground. The wire in the loop counterpoises is insulated and is laid directly on the ground to couple capacitively to ground. The existing ground ra

The antenna isolator shown on the web page is one I've designed for use with isolated loop counterpoises. I recently wrote an article on loop counterpoises showing how isolating them almost eliminates

Hi Ray, As you have found the minimum voltage for the Loop Antenna Amplifier + is just below 5 V. The USB voltage output from some computers may be lower than 5 V and in that case an external USB hub