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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment. |
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5th Jun 2020, 3:22 pm | #1 |
Pentode
Join Date: Apr 2007
Location: Sint-eloois-winkel 8880, Belgium.
Posts: 168
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Howes DFD4/5 counter
hi,
anyone familiar with this counters it has a matrix board howes pmb4 there is a A and b swith on the front a = usb,lsb,am&fm b = usb,lsb,am&fm a is not selectable by the switch, only b there is also a small dfd4 pcb mounted is the counter dfd4 or5....... picture atached regards carlos |
5th Jun 2020, 3:26 pm | #2 |
Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 9,637
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Re: Howes DFD4/5 counter
Some information here: http://www.snowbird.plus.com/electronics/index.shtml
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5th Jun 2020, 4:33 pm | #3 |
Hexode
Join Date: Mar 2009
Location: Minneapolis, Minnesota, USA.
Posts: 275
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Re: Howes DFD4/5 counter
This kit was originally made by C.M. Howes Communications. It was last sold no later than early 2004. You have the DFD4 (four digit) counter with the PMB4 programmable matrix board for 6 programmable offsets. The DFD4 just had one. The DFD5 counter had a 5-digit display but without a programmable offset,
Please see these two links: https://web.archive.org/web/20000523...-html/DFD4.htm https://web.archive.org/web/19991109...tinfo/DFD4.pdf Then you should ask the GQRP club for copies of the kit instructions for both the DFD4 and PMB4. See http://www.gqrp.com/howes.htm HTH and 73 John |
5th Jun 2020, 5:16 pm | #4 |
Pentode
Join Date: Apr 2007
Location: Sint-eloois-winkel 8880, Belgium.
Posts: 168
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Re: Howes DFD4/5 counter
thanks to all who responded carlos
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5th Jun 2020, 6:51 pm | #5 |
Pentode
Join Date: Apr 2007
Location: Sint-eloois-winkel 8880, Belgium.
Posts: 168
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Re: Howes DFD4/5 counter
hi, was the bcd programmable matrix board dfd4 pmb4 factory assembled..
nothing in any parts list manual...... |
6th Jun 2020, 12:35 am | #6 | |
Tetrode
Join Date: Mar 2019
Location: York, North Yorkshire, UK.
Posts: 95
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Re: Howes DFD4/5 counter
Quote:
The board was not factory assembled - the builder programmes it by fitting the appropriate diodes. I have the manual for the PMB4 which explains all (The DFD4 manual also shows the arrangement of program diodes in page 6 of the assembly instructions, but for single offset only). I can scan this in a day or so - I have your email as shown on QRZ.COM. PM me if you would like more info.
__________________
John G4FDD G-QRP 431 |
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6th Jun 2020, 10:16 am | #7 |
Pentode
Join Date: Apr 2007
Location: Sint-eloois-winkel 8880, Belgium.
Posts: 168
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Re: Howes DFD4/5 counter
hi john, please mail me the info, much apreciated,time is not important hi
regards carlos |