[Repeater-Builder] Re: Micor Pin Gunk
If you are using Isopropyl alcohol as a 'thinner', be careful where you use it. We had significant problems with softening of the capstan drive pinch wheels in a well known make of broadcast video recorders when they had been accidentally splashed with Iso'. Gordon ZL1KL
Re: [Repeater-Builder] Re: Circular polarization for VHF repeaters?
HI to all, I guess that I do not have much to contribute on this thread but to me it is very interesting reading. Gary has my sympathy, his problem is duplicated here. Much of my repeater work relates to a low power portable repeater on 141 MHz. We live near a medium sized mountain range which has plenty of deer and wild pigs. Hunters go looking for them and perhaps get lost, or fall and break a leg. Also, there are recreational trampers who just get lost . Several times a year we have to go find, and rescue them. The last time was two days ago at 6.30 am. For once, it was not raining! Our repeater runs 5 watts output, needs to run three or four days off a gelcell, and most importantly has to fit into a backpack to be carried to a convenient hilltop. Fortunately, the split is 3 MHz so that the duplexer is of a reasonable size. The problem is getting reasonable coverage. Sure the search areas are fairly small but usually encompass several ridges and deep valleys. We use vertical polarisation with a 5/8 whip on the repeater and the search teams have flexible dipoles that fit into their backpacks. Sharp ridges and steep slopes contribute to coverage problems. Would circular polarization help?? I think not. Gordon ZL1KL Tauranga N.Z.
[Repeater-Builder] Ariels, Aerials, Antenna, Antennae?
Here down under, we are presently working through a District Planning exercise where the City Fathers think that the words Antenna and Aerial mean two quite different things. Should we lose, we may well be back to smoke signals. Gordon ZL1KL
Re: [Repeater-Builder] Smart Batt Charger - not quiet off topic
I use a Solar Panel controller built from a kit by Otley Electronics in Australia. Has been going two years without problems. Battery voltage is sensed continually and cut-off point adjustable. Battery then cycles on/off, switching by a MosFet and hysteresis can be altered. Gordon ZL1KL Tauranga N.Z.
Re: [Repeater-Builder] Smart Batt Charger - not quiet off topic
On 28/08/10 11:55, x.tait.tech wrote: How much did this unit cost roughly, and do you have the URl of the company or were the parts available here Marcus Sorry Marcus I mis-spelt their name, it is Oatley. www.oatleyelectronics.com.au. Cost about $18AU bare and $24AU with a waterproof box. I purchased directly from them. The only thing I found wrong was a couple of mistakes in their technical documentation - so I rewrote part of it for them. Gordon. Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) * To change settings via email: repeater-builder-dig...@yahoogroups.com repeater-builder-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: repeater-builder-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Adding capacitors to lower electric bill
Another quirk. Sixty plus years ago in England, power factor was not the main concern. Many of the domestic radio receivers were transformerless and used half-wave rectification to obtain D.C. for the tubes. A consequence was a fair dose of D.C. flowing in the street power mains. Gordon ZL1KL Tauranga N.Z.
Re: [Repeater-Builder] made a rpt
The gentleman's address is Brazil, you need Portugese, not Spanish. Gordon ZL1KL
[Repeater-Builder] Tait T296 PSU Circuit
niteviser, Thanks a lot, circuit downloaded without trouble. Gordon ZL1KL
[Repeater-Builder] Tait T296/01
I would be grateful for any info' about a Tait T296/01 PSU. It is in a rack of Tait repeater gear that I am re-conditioning for a local SAR group. I am guessing at 13.8V 10A in terms of the transmitter's power needs, but the regulator looks to be a bit light for 10 Amps. OK, I may have to trace out the circuitry but if someone has the specs' or a circuit it will save some time. Thanks, Gordon ZL1KL Tauranga N.Z
Re: [Repeater-Builder] Re: Dissasembly of msr 2000 continuous duty amp. How?
Maybe a little Black Powder might be needed? Gordon ZL1KL Tauranga N.Z.
[Repeater-Builder] STK-077
Greetings to all, I apologise for enquiring about a medium frequency component on a Group that works on VHF and above, but I would be grateful if anyone can point me towards a supplier of STK-077 power transistors or their equivalents. I have inherited an Icom IC720A that has suffered from a fire in the output stages. I plan to rebuild it, if I can locate replacement amplifiers. Thanks, Gordon ZL1KL. Tauranga N.Z
[Repeater-Builder] Re : Astron Power Supplies
Hi Jim, I have following this conversation thread over the past few days and note your comments about overcharging. I have been through this situation and settled on a solar panel charge controller. The unit I am using uses a MOSFET to do the switching and a hefty Schotty diode to isolate the battery. The 'charged' voltage is adjustable - in my case it is 14.4 volts on a bank of SLA's. The hysteresis can be preset so that the charger is not turning on/off every few seconds. Gordon ZL1KL Tauranga N.Z.
[Repeater-Builder] Encoder/Decoder
Was looking for something else in an old ARRL Handies found the comment that the 567 requires high quality capacitors to maintain stability. On another subject, any advice on purchasing duplexers for 2 metres? Our local supplier has closed down and such items are like hens teeth here Down Under. Cheers, Gordon ZL1KL Tauranga New Zealand.
