Dear All, Thanks to Graham and Martin for their help with this. I have worked out what is happening with the ethernet interface: When operating direct from the controller the angle display only update

Dear Martin, Thanks for the advice. Yes, I’ve changed pots in the past- the current one is a Bourns 10 turn and resistance values are normal and stable. I have the pot replacement instructions, thanks

Dear Graham, Thanks. I checked this and the resistance to the motor wires was indeed multi MOhms. Because of the exposed location, a lot of protection was applied to cable joints, rotator and junction

Dear All, I have a PST2051D, which has developed a fault. Angular readout is incorrect, both on the controller display and remotely via ethernet board, and drifts by large amounts, many 10s of degrees

Dear David, Looks like you have got to that stage in your HP collecting where you need to pick up a 19” rack or three on e-bay with suitable shelves/sliders. I don’t know how many HP cases are suppose

Dear David, Wimo return loss at the bottom end of the 23cm band falls significantly with rain. I suspect that the gain falls, too, but have not made measurements. Many professional UHF antennas shroud

Dear John, Thanks for the confirmation; there are many possible sources of hum on remote systems, so that saves time wasted checking. Since it is 100Hz hum, may well be dried out electrolytics, but th

Recent good tropo. has raised GB3MHZ on 23 cm to S9+ with me in IO92FA. This has enabled me to hear a slight 100Hz hum on carrier. Please could a local confirm whether this is actually on the beacon o

Dear All, It seems a feature of getting older is that one gets more grumpy. I really do think that both RSGB and ARRL are wonderful value for money; certainly compared with the professional organisati

Dear All, Neil’s post is a reminder of the hazards of rawl-bolt fixing, especially with dynamic loading such as aerial masts. Having seen one mast eventually wear away the rawl-bolt holes, causing a c

Dear All, Yes, indeed. Eimac used to put the BeO hazard sheet in with all power grid tubes and it was popularly supposed that 4CX250Bs and their more powerful cousins used BeO. I think the actual posi

Dear All, I have a few lengths of LDF5-50A with N connectors, which I don't have room to store. Total about 40m in lengths from 5m to 17m. Please contact me off-list if interested. They would be for c

Dear All, I had a lengthy, rather heated, exchange with a technical representative of a major professional broadcast aerial manufacturer who was insisting on quoting aerial return losses to the neares

Dear Conrad, "Why on earth would you wrap insulating tape over Denso tape? 73 Conrad PA5Y" I don’t know why this was done by the riggers for a professional customer. I do know that it was a bad idea.

Dear Mike, DTELS method was self-amalgamating tape first, then Denso tape. Wrapping Insulating tape over Denso tape is unhelpful, as water seeps under the insulating tape and stays trapped underneath.

Dear All, Denso tape is still available and works very well over self-amalgamating tape. I know it is not pleasant to work with and due regard to the H&S instructions is necessary, but the coaxial cab

Dear All, If anyone has a nice build of an Iceni 70cm Transverter or a complete kit, please let me know off list, as I am interested in buying one. Thanks, Alwyn G8DOH

Dear All, Attached the phase and amplitude noise + spurs for the Leo Bodnar at 10 MHz. Since the loop bandwidth of the PLL to lock the OCXO in a TX/RX would be a few Hz, maximum, in a well-designed sy

Dear Ian, Genuine Times Microwave LMR-400 Ultraflex is indeed a product that stands up fairly well to flexure. Importantly, unlike the M&P cables, it also has high braid coverage, so that even if the

Dear Andy, I thought the standard for beacon reporting was an equivalent noise bandwidth of 2.5 kHz? On beaconspot it says "S/N report is in 2.5kHz bandwidth”. So, I report accordingly. As you say, SD