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Beacons ...
Robin the Propagation Studies Group of the RSGB manatains a beacon list, but It depends what you mean by ''official'' and it is generally below 50MHz, relying on the UK Microwave group list for higher
Robin the Propagation Studies Group of the RSGB manatains a beacon list, but It depends what you mean by ''official'' and it is generally below 50MHz, relying on the UK Microwave group list for higher
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Alan Melia
· #67284
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13cm filter
Hi Simon, as a geriatric I find paper often is much easier to search than a web site :-)) Hope they have a suitable size Alan G3NYK
Hi Simon, as a geriatric I find paper often is much easier to search than a web site :-)) Hope they have a suitable size Alan G3NYK
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By
Alan Melia
· #67018
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13cm filter
Try search ''end feed pipefittings'' (pg 473 in my paper cat) part# for 15mm 90441 ''flowmasta'' Alan G3NY
Try search ''end feed pipefittings'' (pg 473 in my paper cat) part# for 15mm 90441 ''flowmasta'' Alan G3NY
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By
Alan Melia
· #66998
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13 cm PA amplifier that uses a 2C39 Valve
Hi Paul, I did see that on one of the tables, was it Mike's G6TRM?. Mine was part of the kit from from the cleance Bob G4BAH (SK) There was also a water cooled version. I will dig them out because the
Hi Paul, I did see that on one of the tables, was it Mike's G6TRM?. Mine was part of the kit from from the cleance Bob G4BAH (SK) There was also a water cooled version. I will dig them out because the
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By
Alan Melia
· #66866
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Avoid VAT trauma !
It was nice to meet some of you again at Martlesham on Sunday. I now need to refill my stock some sizes of tin-plate boxes. I am aware of the effect that commission and double VAT can make of the cost
It was nice to meet some of you again at Martlesham on Sunday. I now need to refill my stock some sizes of tin-plate boxes. I am aware of the effect that commission and double VAT can make of the cost
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By
Alan Melia
· #66858
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MHRT attendance
Aha I spy a subtle opportunity for sneaky Ad.........As there is no attenance list on the web page this year, Sam suggested we might like to declare our attendance. I will be there accompanied by a st
Aha I spy a subtle opportunity for sneaky Ad.........As there is no attenance list on the web page this year, Sam suggested we might like to declare our attendance. I will be there accompanied by a st
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By
Alan Melia
· #66763
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WG16 ...
Save you a few grams on your luggage Kent :-)) Alan G3NYK
Save you a few grams on your luggage Kent :-)) Alan G3NYK
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By
Alan Melia
· #66585
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WG16 ...
Hi Robin are you coming to Martlesham? I can supply a 60cm length of unused WG16 Alan G3NYK
Hi Robin are you coming to Martlesham? I can supply a 60cm length of unused WG16 Alan G3NYK
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By
Alan Melia
· #66582
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ICL7660 or ICL7662 for 12v input
The RAG VLF receiver uses an ICL7662 to derive a negative supply from 12v. We have built nearly 200 of these and I do not recall a single failure. From memory the 7660 is only spec'd to 10v input. It
The RAG VLF receiver uses an ICL7662 to derive a negative supply from 12v. We have built nearly 200 of these and I do not recall a single failure. From memory the 7660 is only spec'd to 10v input. It
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By
Alan Melia
· #66578
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23cm QRM
Hi Robin, sadly that may not have much effect. Ofcom seems to be awaiting a complaint from the primary user. I'm not sure who that is but probably aeronautical ?? Like cases where radar sets have ''go
Hi Robin, sadly that may not have much effect. Ofcom seems to be awaiting a complaint from the primary user. I'm not sure who that is but probably aeronautical ?? Like cases where radar sets have ''go
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By
Alan Melia
· #66506
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[Microwaves] Vintage 10cm's waveguide wabed
Hi Neil yes I suspect when the war started only small quantities of guide were produced in the UK. We tended to make the inside dimensions ''whole inches''. It would seem possible that when the US rec
Hi Neil yes I suspect when the war started only small quantities of guide were produced in the UK. We tended to make the inside dimensions ''whole inches''. It would seem possible that when the US rec
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By
Alan Melia
· #65957
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Vintage 10cm's waveguide wabed
Andy, isn't he quoting that as the narrow dimension. my bit of Old English is 1 inch by 0.5 inch (in olde english dimensions :-)) ) Indeed Wikipedia quotes OBOE as using 10cm wavelength which would su
Andy, isn't he quoting that as the narrow dimension. my bit of Old English is 1 inch by 0.5 inch (in olde english dimensions :-)) ) Indeed Wikipedia quotes OBOE as using 10cm wavelength which would su
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By
Alan Melia
· #65947
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Vintage 10cm's waveguide wabed
I might be wrong but 1 x 2.5 ins does not sound like 10GHz to me......more like 4GHz I have a short length of 10GHz Old English and it just fits over WG16. Was used in the early days as a joiner when
I might be wrong but 1 x 2.5 ins does not sound like 10GHz to me......more like 4GHz I have a short length of 10GHz Old English and it just fits over WG16. Was used in the early days as a joiner when
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By
Alan Melia
· #65944
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Londex Coaxial Relay
Hi Paul I used one of these on HF about 50 years ago. The connector is often refered to as Burndept the ones I have are stamped ''F&E'' They were used on the RA17 I believe and on directional couplers
Hi Paul I used one of these on HF about 50 years ago. The connector is often refered to as Burndept the ones I have are stamped ''F&E'' They were used on the RA17 I believe and on directional couplers
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By
Alan Melia
· #65936
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Buying from the EU
Hi Clive my experience with company purchases is similar, dispatch without incurring German VAT, delivery via ParclForce after payment of UK Vat (not needed to be estimated it is 20% 0f the invoice to
Hi Clive my experience with company purchases is similar, dispatch without incurring German VAT, delivery via ParclForce after payment of UK Vat (not needed to be estimated it is 20% 0f the invoice to
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By
Alan Melia
· #65597
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€44.76 EUR puff of smoke
Hi Ian yes from memory I believe the 741in unconditonally stable but the 748 has a higher gain-bandwidth which is better in the front end signal path. I built a Texan in about 1975 and unusually could
Hi Ian yes from memory I believe the 741in unconditonally stable but the 748 has a higher gain-bandwidth which is better in the front end signal path. I built a Texan in about 1975 and unusually could
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By
Alan Melia
· #65394
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Tin-box URL
Hi Robin I tried but that message disappeared into the byte bucket......interesting yours got through. I am having odd problems with either BT or groups.io (unlikely) For instance BT is dumping digest
Hi Robin I tried but that message disappeared into the byte bucket......interesting yours got through. I am having odd problems with either BT or groups.io (unlikely) For instance BT is dumping digest
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By
Alan Melia
· #64436
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Tin-box URL
Hi All, It looks as though my previous posting (22:00 on 12th) has been treated as spam by groups.io because it has not appeared in the message list after 12hours ......probably because of the clickab
Hi All, It looks as though my previous posting (22:00 on 12th) has been treated as spam by groups.io because it has not appeared in the message list after 12hours ......probably because of the clickab
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By
Alan Melia
· #64434
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Tin-box web site
Hi all, sorry to those who may have tried to access the box list on my web site. I am in the process of changing domains and will advise here when it is active again. Keep on building :-)) Alan G3NYK
Hi all, sorry to those who may have tried to access the box list on my web site. I am in the process of changing domains and will advise here when it is active again. Keep on building :-)) Alan G3NYK
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By
Alan Melia
· #64421
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SMA questions
Hi Simon I am sorry not to make SMA plugs available, but with the options of solder or crimp and the dozen or more different coax cables required it would not be worthwhile. Personally I have a number
Hi Simon I am sorry not to make SMA plugs available, but with the options of solder or crimp and the dozen or more different coax cables required it would not be worthwhile. Personally I have a number
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By
Alan Melia
· #63807
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