[Repeater-Builder] RE [Fwd: 3SK174 vs BF988]
Greeting fm Down Under.. I sent out a request to this group as below, but being out of circulation for the last 3 weeks, I can now expand on my findings, and perhaps an answer to Geoff Pike and today Ted Sims at tedsims dot com ...wrote in a private mail: Anyway, do you still need help with this? What kind of test equipment do you have? What's the reason for wanting to change to the BF988? The 3SK174 is a fine transistor. Jerry Vogt wrote: We do have some 3SK174's available now for $16.50. They can also supply the BF988 for the same price. Huh??!! If the 3SK174 is obsolete but priced at US$16.50 +PnP why do they list the BF988 at the same price. I've since sourced the BF988 locally. My query was based on the following: The 3SK174 is a dualgate MESFET The BF988 is a dualgate MOSFET I could rave on, but the main concern was the suggestion that the BF988 can replace a 3SK174 but some retuning is necessary. 73 John VK4JKL Original Message Subject: 3SK174 vs BF988 Date: Fri, 05 Sep 2008 08:02:41 +1000 From: jgielis [EMAIL PROTECTED] To: Repeater group Repeater-Builder@yahoogroups.com Hi, can someone expand on the procedure for retuning a HRG-(VHF) helical resonator when the 3SK174 is replaced with a BF988. I have recently sent an email to Hamtronics requesting further info on their suggestion (on their webpage) that states It may require some retuning, but as yet there has been no response, except to suggest that they can source both FET's. 73 John VK4JKL IRLP 6163
[Repeater-Builder] UHF TX Combiner RX Multi-Coupler Wanted
Hello all, I'm in need of a transmit combiner and receive mutli-coupler for the UHF Ham Bands. I'm located within the Los Angeles area and am not interested in buying new (you know us hams). I would like it to be a real factory built unit (not pieced together). Please e-mail me direct at [EMAIL PROTECTED] Thanks ! Paul Metzger
[Repeater-Builder] Re: UHF TX Combiner RX Multi-Coupler Wanted
Re: UHF TX Combiner RX Multi-Coupler Wanted Well... you're not being all that specific about how many tx channels and antennas you plan to use/operate. You could make one to fit your needs. The do-it-yourself 4 to 6 channel TX Combiner side starts off by trying to obtain Motorola T1500 series bandpass duplexers. Step two is a circulator/isolator for each Tx channel. Each 4 cavity T1500 Band Pass Duplexer sets up as two or four tx combiner channels depending on tx power level, the realistic specs you hope to obtain and the insertion loss. The real world means you should (with this hardware) really use two T1500 series BP bottles (cavities) in/for each Tx Path (along with a circulator). The Rx side has its own wild cards... depending on how many receivers, their frequency spacing and location relative to the tx channels, separate or duplex antenna, receive preamplifiers, desired protection, the guy down the hill with the 100 watt remote base, the amount of money you want to spend... regular or decafe... cream and sugar? Can you say... Ebay? ...followed by lots of questions to the group and/or guys who do a fair amount/number of this type of work. cheers, s. Paul Metzger [EMAIL PROTECTED] wrote: Hello all, I'm in need of a transmit combiner and receive mutli-coupler for the UHF Ham Bands. I'm located within the Los Angeles area and am not interested in buying new (you know us hams). I would like it to be a real factory built unit (not pieced together). Please e-mail me direct at [EMAIL PROTECTED] Thanks ! Paul Metzger
RE: [Repeater-Builder] UHF TX Combiner RX Multi-Coupler Wanted
Paul, Knowing how cheap Hams can be, I have to wonder how likely it is that a Ham would have paid to have such units factory-built for the 70cm band- probably several thousand dollars. Such devices are built to order for specific frequencies, and it is likely that some expensive rework will be needed to move them to new frequencies. However, let's be optimistic and concentrate on the technical issues. How many TX frequencies do you want to combine, and how far apart is each from its adjacent frequency? How much power does each transmitter have? Are there other transmitters at the site, and if so, what are their frequencies and power levels? Do you already have ferrite isolators and harmonic filters for each TX frequency? For the RX multicoupler, how many frequencies do you want to combine, and what is the spread? How close are other in-band transmitter frequencies? Does each receiver have an effective preselector front-end, like Micor and Mastr II radios? Since you're in the LA area, I suspect that your site is shared with dozens of other radio services. It is difficult enough to set up a single repeater pair at a densely-populated site, and setting up a combiner and multicoupler may be a significant challenge. One option that might be worthwhile is to piggy-back on an existing transmitter combiner and/or an existing receive multicoupler. It is more likely that you would be allowed to share a receive multicoupler, since transmitter combiners have components that are frequency-specific and very expensive. It can't hurt to ask. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Paul Metzger Sent: Sunday, October 12, 2008 8:21 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] UHF TX Combiner RX Multi-Coupler Wanted Hello all, I'm in need of a transmit combiner and receive mutli-coupler for the UHF Ham Bands. I'm located within the Los Angeles area and am not interested in buying new (you know us hams). I would like it to be a real factory built unit (not pieced together). Please e-mail me direct at [EMAIL PROTECTED] mailto:paulmetzger%40fastmail.net Thanks ! Paul Metzger
[Repeater-Builder] identifying Sinclair UHF Duplexer Model 1965
Can someone pls. give me the basic specs., especially max. power level ?? Small enclosure., approx. 12x6x4 high . Rx side has three cavities., square., tx side has two cavities. Tnx for the assist Jerry VE3EXT
RE: [Repeater-Builder] identifying Sinclair UHF Duplexer Model 1965
Jerry, I believe that the Model 1965 was a special design, and not a production item. Try contacting Sinclair Tech Support here: [EMAIL PROTECTED] 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Sunday, October 12, 2008 9:51 AM To: repeater-builder@yahoogroups.com Subject: [Repeater-Builder] identifying Sinclair UHF Duplexer Model 1965 Can someone pls. give me the basic specs., especially max. power level ?? Small enclosure., approx. 12x6x4 high . Rx side has three cavities., square., tx side has two cavities. Tnx for the assist Jerry VE3EXT
[Repeater-Builder] Phone patch for Master 2,which one???
hi all i need some advise,i need a simple ,efficient phone patch for my master 2, not complicated,do you have any advise,any web sitebest a bargain for me :-) i am working on a mountain at 3000 feets and i dont want to go there every week-end so i installed an Master 2 now it is time for the phone patch . thanks for your advise group,it will be appreciated,by the way is there a web site for some parts, i need a receiver and his exiter too,,vhf low split. again thanks gervais ve2ckn
[Repeater-Builder] New Motorola Manuals FS
Have for sale some new/old stock Motorola manuals; # 68P81060E05-C Syntor XX High band instruction manual w/ tuning tools #68P80101W61-A Securnet Syntor manual #68P80102W02-O Syntor installation manual #68P80100W43-E Syntor HHCH manual All are new in the bags and offered as a set for $20 plus s/h. Reply direct to me (off the reflector) if interested. Thanks, Gary San Diego, CA.
