Mil round connectors
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Robin Szemeti - G1YFG
Fianlly, after more than a year, I found time to go and collect the dish and mount I purchased ... it looks to be a heavily built thing, with a feed in WG15 ... opinions are somewhat divided as to whether that will work on 10G, but anyway ... Connectors however are an issue, I got no cabling with this thing and I really can't afford to blow the entire budget on buying them from RS ... I need a couple of the servo connectors, these are a 14-12 cable female, 4 big pins, 8 smaller pins in a 14 sized shell. Looks like:  I need 2 19 pin cable females, 14 size shell ... The RS prices is stupid, there are some in the USA on eBay that are more affordable, but before I resort to that I wonder if anyone has any lying around in their "unusual mil spec round connectors" box? Happy to pay £10 a connector. Just FYI this driven by two-phase AC servos and has resolver feedback. I plan to use a Mesa 5i23 CNC control card, with the 7i49 6 channel resolver card for control, and probably some home-brew DSP for the 2 phase servo signal generation, feeding a 4 channel Class D audio amplifer to provide the actual drive to the servos, and a bit of Python script to calculate the moon position and send motion control commands to the controller. What could possibly go wrong?
-- Robin Szemeti - G1YFG 
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Mike
I’ll have a look, you might be lucky! Is it 12 or 19 pin you need, you mentioned both?
73, Mike, Mike Stevens, G8CUL/M0CUL/F4VRB.
From: UKMicrowaves@groups.io On Behalf Of Robin Szemeti - G1YFG via groups.io
Sent: 21 January 2023 11:45 To: moon-net@...; moon@...; UKMicrowaves@groups.io Subject: [UKMicrowaves] Mil round connectors
Fianlly, after more than a year, I found time to go and collect the dish and mount I purchased ... it looks to be a heavily built thing, with a feed in WG15 ... opinions are somewhat divided as to whether that will work on 10G, but anyway ...
Connectors however are an issue, I got no cabling with this thing and I really can't afford to blow the entire budget on buying them from RS ... I need a couple of the servo connectors, these are a 14-12 cable female, 4 big pins, 8 smaller pins in a 14 sized shell. Looks like:
I need 2 19 pin cable females, 14 size shell ...
The RS prices is stupid, there are some in the USA on eBay that are more affordable, but before I resort to that I wonder if anyone has any lying around in their "unusual mil spec round connectors" box?
Happy to pay £10 a connector.
Just FYI this driven by two-phase AC servos and has resolver feedback. I plan to use a Mesa 5i23 CNC control card, with the 7i49 6 channel resolver card for control, and probably some home-brew DSP for the 2 phase servo signal generation, feeding a 4 channel Class D audio amplifer to provide the actual drive to the servos, and a bit of Python script to calculate the moon position and send motion control commands to the controller. What could possibly go wrong?
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ian hope (2E0IJH)
Have you tried someone like Rays tek on ebay, https://www.ebay.co.uk/str/raysteksurplusltd?_trksid=p2047675.m3561.l2563
He often has things like this
Ian
M5IJH Sent: Saturday, January 21, 2023 at 11:45 AM
From: "Robin Szemeti - G1YFG via groups.io" <robin@...> To: moon-net@..., moon@..., UKMicrowaves@groups.io Subject: [UKMicrowaves] Mil round connectors Fianlly, after more than a year, I found time to go and collect the dish and mount I purchased ... it looks to be a heavily built thing, with a feed in WG15 ... opinions are somewhat divided as to whether that will work on 10G, but anyway ...
Connectors however are an issue, I got no cabling with this thing and I really can't afford to blow the entire budget on buying them from RS ... I need a couple of the servo connectors, these are a 14-12 cable female, 4 big pins, 8 smaller pins in a 14 sized shell. Looks like:
 I need 2 19 pin cable females, 14 size shell ...
The RS prices is stupid, there are some in the USA on eBay that are more affordable, but before I resort to that I wonder if anyone has any lying around in their "unusual mil spec round connectors" box?
Happy to pay £10 a connector.
Just FYI this driven by two-phase AC servos and has resolver feedback. I plan to use a Mesa 5i23 CNC control card, with the 7i49 6 channel resolver card for control, and probably some home-brew DSP for the 2 phase servo signal generation, feeding a 4 channel Class D audio amplifer to provide the actual drive to the servos, and a bit of Python script to calculate the moon position and send motion control commands to the controller. What could possibly go wrong?
-- Robin Szemeti - G1YFG |
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Robin Szemeti - G1YFG
Hi Mike, Ultimately, I am looking for 2 of each ... the 12 pin drives the motors on the elevation and azimuth units, the 19 pin providers the resolver feedback ... On Sat, 21 Jan 2023 at 12:44, Mike <mikeg8cul@...> wrote:
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Robin Szemeti - G1YFG |
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Robin Szemeti - G1YFG
Yes, I found a few on eBay, there is a guy in Latvia with some at almost sensible prices but if there are some locally, I'll take that first. On Sat, 21 Jan 2023 at 13:48, ian hope (2E0IJH) <ian@...> wrote:
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Robin Szemeti - G1YFG |
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Mike
Found some 14-12 sockets, will check for 14-19 too…
73, Mike, Mike Stevens, G8CUL/M0CUL/F4VRB.
From: UKMicrowaves@groups.io On Behalf Of Robin Szemeti - G1YFG via groups.io
Sent: 21 January 2023 13:52 To: UKMicrowaves@groups.io Subject: Re: [UKMicrowaves] Mil round connectors
Hi Mike,
Ultimately, I am looking for 2 of each ... the 12 pin drives the motors on the elevation and azimuth units, the 19 pin providers the resolver feedback ...
On Sat, 21 Jan 2023 at 12:44, Mike <mikeg8cul@...> wrote:
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Robin Szemeti - G1YFG
Amazing ... pm me and I'll PayPal you. On Sat, 21 Jan 2023 at 15:01, Mike <mikeg8cul@...> wrote:
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Robin Szemeti - G1YFG |
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Robin Szemeti - G1YFG
And for anyone that cares, this is the azimuth slewing mechanism at the base (with the big circular frame) and the elevation mechanism assembled to it. These two parts weigh around 70kg. There is a 4 legged tripod (quadrapod?) that this thing sits on, a WG15 feedhorn, with cassegrain and 4 petals to complete the dish. I might try assembling the whole thing in the dining room, although I suspect my wife will declare it to be an "outdoor pet" at somepoint ... On Sat, 21 Jan 2023 at 15:10, Robin Szemeti - G1YFG via groups.io <robin=redpoint.org.uk@groups.io> wrote:
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Robin Szemeti - G1YFG 
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Robert G8RPI
If Mike can't find any 19 pin ones drop me a PM. I've almost certanly got a couple. Do you have data on drive and the pin-outs? How are you going to interface to it, servo control or just motor and readout. I might be able to help there too. |
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Robert G8RPI
Oops,
didn't read far enough. looks like you have the control under control..... Robert G8RPI. |
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Neil Smith G4DBN
Awwww, but it's so CUTE!
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On 21 Jan 2023, at 15:51, Robin Szemeti - G1YFG via groups.io <robin@...> wrote: |
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Robin Szemeti - G1YFG
Hi Robert, I have no clue what frequency/voltage the AC servos are likely to need. I am assuming they are 50Hz, but if you have any other general wisdom on these, I'd be interested to hear it. They are not very big, 50mm diameter, 100mm long ... but no rating plate and the company that made them is long gone. I'm seeing about 80 ohms DC looking into the windings ... I can't find where I have put my L/C meter at the moment, so can't measure the inductance. I have "a few" audio amplifiers that will deliver up to a a few kW, +- 100V rails are pretty standard .... if it is just 50Hz I can generate the 0 and 90 sinewaves within LinuxCNC itself, just by sending the right values to the D/A convertor outputs. There is a task loop that runs at about 1khz which will be fast enough for producing a 50 Hz sinewave (20 points per cycle is probably enough, a LPF will sort it). If they need 400Hz, I may have to think of "other ways" ...
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Robin Szemeti - G1YFG |
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Robert G8RPI
Hi Robin, The motors sound pretty small for 50Hz. Who made them and is there a part nmber on them? |
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Robin Szemeti - G1YFG
Land based, SkyNet 5 system. The resolvers are good over the 2.5kHz to 10kHz sort of range, its just the servo motors I have no clue about.
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Robin Szemeti - G1YFG |
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Jan Boutsen
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From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> On Behalf Of Robin Szemeti - G1YFG via groups.io
Sent: Saturday, January 21, 2023 12:45 PM To: moon-net@...; moon@...; UKMicrowaves@groups.io Subject: [UKMicrowaves] Mil round connectors
Fianlly, after more than a year, I found time to go and collect the dish and mount I purchased ... it looks to be a heavily built thing, with a feed in WG15 ... opinions are somewhat divided as to whether that will work on 10G, but anyway ...
Connectors however are an issue, I got no cabling with this thing and I really can't afford to blow the entire budget on buying them from RS ... I need a couple of the servo connectors, these are a 14-12 cable female, 4 big pins, 8 smaller pins in a 14 sized shell. Looks like:
I need 2 19 pin cable females, 14 size shell ...
The RS prices is stupid, there are some in the USA on eBay that are more affordable, but before I resort to that I wonder if anyone has any lying around in their "unusual mil spec round connectors" box?
Happy to pay £10 a connector.
Just FYI this driven by two-phase AC servos and has resolver feedback. I plan to use a Mesa 5i23 CNC control card, with the 7i49 6 channel resolver card for control, and probably some home-brew DSP for the 2 phase servo signal generation, feeding a 4 channel Class D audio amplifer to provide the actual drive to the servos, and a bit of Python script to calculate the moon position and send motion control commands to the controller. What could possibly go wrong?
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Robin Szemeti - G1YFG
Just a note to say thank you to Mike CUL for digging through the contents of his stores and finding me the required plugs ... fiddling with the reolvers and servos can now commence! On Sat, 21 Jan 2023 at 11:45, Robin Szemeti <robin@...> wrote:
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Robin Szemeti - G1YFG |
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Paul Randall G3NJV
TOTALLY OFF TOPIC but some years ago I bought “CLEARANCE SALE” driveway blocks at my local builders merchant. I didn’t have room for them (20x 1 ton pallets) at the time so agreed they would remain in the yard until I was ready for delivery, giving mobile and home phone numbers, email and customer account details for contact if they became a problem.
Here’s the connection; as Robin wrote, “after more than a year, I found time to go and collect ...” ... in my case, to go and arrange delivery. I was informed the yard had no record of the sale, having had a new manager and IT system installed since my purchase. I pointed to the pallets in the yard with my name on them and produced the sale documents. The new manager offered a “gesture of goodwill” to deliver free of charge what they found in the yard, which was less than half what I had bought. “Fruitless” would describe our conversation so I resorted to my usual method of finding somebody with authority to solve a problem. I emailed the company CEO, pointing out the secure yard had either sold the blocks twice or they had been stolen. Problem then rapidly solved by the area manager. Why I posted this? – beware leaving your paid-for stuff in someone else’s hands for a long time. Plus, CEOEMAIL.COM (no connection) can find powerful allies to solve problems. Of course, CEO’s never actually get your email but many companies employ a dedicated executive team to respond and my goodness, they get things done!
Sent from Mail for Windows
From: Robin Szemeti - G1YFG via groups.io
Sent: 26 January 2023 00:15 To: UKMicrowaves@groups.io Subject: Re: [UKMicrowaves] Mil round connectors
Just a note to say thank you to Mike CUL for digging through the contents of his stores and finding me the required plugs ... fiddling with the reolvers and servos can now commence!
On Sat, 21 Jan 2023 at 11:45, Robin Szemeti <robin@...> wrote:
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Robin Szemeti - G1YFG
Good advice ... in my case the dish was with the most excellent G4KPV, one of the world's true gentlemen. I had no need to worry. -- Robin Szemeti - G1YFG |
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Robin Szemeti - G1YFG
Ooops, G8KPv, although I am sure whoever the G4 is is excellent too :) On Wed, 1 Feb 2023 at 22:26, Robin Szemeti <robin@...> wrote:
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Robin Szemeti - G1YFG |
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