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  • MitchellB's Avatar
    Today, 15:56
    MitchellB replied to a thread ALC cable to linear? in Accessories
    My avatar is an old chalk drawing I did as a teenager of Linda Ronstadt and Emmylou Harris, so I'm impressed you even noticed it. I thought I might need the PNP5M interface cable, but I found a schematic of the ARB704 and decided I could just the old Yaesu CT61 cable (which I have) instead. That way I would have connections for a 2m, 6m and 70cm linear amp later on down the road if I wanted to add them. Where if I used the PNP5M, it uses the same STBY jack from my FT847 but without using the other 3 pins according to the email Ameritron sent me. I'm still not sure if I'll need the ALC cable with this setup or not though. I am getting pretty good distance with my setup as it is when conditions are good. I have broken 5000 miles and just this weekend talked to some folks in the AZ QSO party from here in NC. However, I was hoping that a 300 watt or so boost or just a single S unit in talk power from a small linear, may give me a little more clear talk power to those distant stations that I can hear;...
    6 replies | 287 view(s)
  • paulears's Avatar
    Today, 07:43
    paulears replied to a thread First yagi in Antennas
    Ah - I was thinking it was going out and back again, then twisted. In performance terms, I doubt you'd find a difference apart from a small change in bandwidth - thicker elements often narrow the bandwidth a bit. Personally, I'd keep it simple and just use a single one. However, half the fun is experimenting. My history suggests most of my efforts using just maths could have been improved with a bit of trial and error!
    3 replies | 157 view(s)
  • paulears's Avatar
    Today, 07:40
    They might be hams, but had anyone studied physics? In particularly moments, compression and tension? A multi section tower is designed with the main strength in the vertical plane. Side force from wind is evenly dispersed. If you examine the video although you can see the strap give way, and the tower comes down intact, the weight of the top section on the pivot point near the strap would have made collapse of the lower tube very likely anyway. Idiots! Almost certainly the OP here doesn't even need a gin pole if the cherry picker is rated for lifting - most sadly, aren't. All the gin pole does is put a hanging point above the top of the next section, so if the tower is vertical and not using tapering sections, you can simple clamp a pulley to the top of a 20ft steel scaff pole, then clamp this to the 2nd from top section, and then attach the top section to the pulley and apply tension. Undo the bolts and the top section lifts - just a couple of inches is fine, you then lower it. Remove the scaff pole,...
    4 replies | 137 view(s)
  • paulears's Avatar
    Today, 07:27
    paulears replied to a thread Kenwood Rx1000 in Antennas
    Don - the centre pin of any connector MUST have a method to attach it to the centre conductor of the coax. Remember that the PL259 connector is now very old, and your RG6 cable is super modern, super slim and the centre conductor quite tiny, but that plug was designed to use coax cable that had a centre conductor made of multiple strands (usually 7) of wire about the same size as the single centre one you have - so the hole that is in the PL259's centre pin will be BIG. If it is not open, then probably it's filled with solder. One of the things about these plugs was that in most designs, the very end of the centre pin was open, and the centre unsoldered conductor was cut so it poked out! You then quickly soldered the very end, and then cut the protruding wire off. If you prepared the cable correctly, then looking in through the side hole you would see the braid, and could solder that. There were some versions where you soldered the centre conductor from the tip AFTER you screwed the cable in, because...
    23 replies | 560 view(s)
  • K7KBN's Avatar
    Today, 05:43
    K7KBN replied to a thread Kenwood Rx1000 in Antennas
    The center conductor of a coaxial cable is called just that. It's not a pin. The male connector has a pin, where the center conductor of the coax normally goes through and gets soldered -- or maybe crimped. I don't have any pictures of the connector you have, but if there's nowhere for the center conductor to go, I'd think the center conductor of your RG-6 may have been crimped on rather than soldered. I mentioned crimping as an alternative to soldering earlier, but for each connector type/cable type combination you'd need a separate set of dies for crimping, and that gets expensive. AND, you can't crimp connectors that are designed to be soldered; you have to get the crimp-type connector.
    23 replies | 560 view(s)
  • WA9WVX's Avatar
    Today, 03:46
    Here's a You Tube Video on How Not To Take an Amateur Radio Tower Down ... What were these individuals thinking before they attempted doing this? https://www.youtube.com/watch?v=YLQPxRQo17I
    4 replies | 137 view(s)
  • 5B4AJB's Avatar
    Today, 03:15
    5B4AJB replied to a thread Brewing a rig in The Junk Box
    Kits are a great introduction to radio. However, you can't really compare 20 or 100 components in a kit to the thousands in a commercial set. A QRP kit is excellent for getting things moving, building and operating it will teach you many things.
    2 replies | 130 view(s)
  • WA9WVX's Avatar
    Today, 02:22
    WA9WVX replied to a thread ALC cable to linear? in Accessories
    Hello Mitchell, OOPS! My mistake on your name ... I looked at your Avatar and assumed (this is very dangerous) that you were a girl / woman, then researching your call letters on QRZ.com I was even more confused. This was strictly my fault and I'm truthfully Sorry it happened.:( Okay I just skimmed over the AL-811 RF Amplifier specifications and MFJ says it produces 600 W PEP Output "almost 2 S Units" which is a lot of baloney being 600 W PEP Output will increase your 100 W PEP from the FT-847 transceiver a + 6 dB to 400 W PEP Output or 1 S Unit plus an additional 200 W PEP Output which is equal to a +3 dB or .5 S Units. Don't get me wrong as the average ham station needs 600 W PEP RF Output to be heard on the other end with our current Propagation / Band Conditions. Years ago will say in the 1970s, 1980s & 1990s it was possible to turn your transceiver on 20 m any time day or night with 100 W PEP RF Output and work people all over the world with +10 to +20 over S9 signals, the HF Bands were HOT...
    6 replies | 287 view(s)
  • OldTube's Avatar
    Today, 00:19
    OldTube replied to a thread Kenwood Rx1000 in Antennas
    I do not understand what you are saying. I am about grade school level on this subject. Don
    23 replies | 560 view(s)
  • K7KBN's Avatar
    Yesterday, 23:51
    K7KBN replied to a thread Kenwood Rx1000 in Antennas
    I'd guess the center conductor of the coax (not the center PIN of the coax) is/was crimped on.
    23 replies | 560 view(s)
  • K7KBN's Avatar
    Yesterday, 23:46
    K7KBN replied to a thread Brewing a rig in The Junk Box
    You DO have an amateur radio license, right? You might read Part 97 of the FCC Rules and check the technical requirements for the transmitter and its signal purity, stability and harmonic and IMD content. A transmitter with a "dirty" signal will generally be a source of QRM, even outside the ham bands.
    2 replies | 130 view(s)
  • Bozza's Avatar
    Yesterday, 20:45
    Bozza started a thread Brewing a rig in The Junk Box
    Im starting to think about building a transceiver for 80metres for use at home. How efficient are home brew rigs when compared to commercial products in suburbia? Is qrm an issue?
    2 replies | 130 view(s)
  • OldTube's Avatar
    Yesterday, 20:19
    OldTube replied to a thread Kenwood Rx1000 in Antennas
    Just to update things a bit. I can solder, learned repairing old radios. One thing I noticed in the videos that were provided was that the center pin of PL259 was open in each instance. It appeared that the center pin of the coax went up through into that center pin and was soldered. My PL259 does not have an opening in the center pin and thus cannot be soldered. Just to reiterate my problem the center pin of the coaxial cable I have (RG6) will not fit into the PL259 hole. It bends the center pin if I try at all to force it. I am awaiting shipment of some new connectors to see if that will help. Regards, Don
    23 replies | 560 view(s)
  • MitchellB's Avatar
    Yesterday, 16:02
    MitchellB replied to a thread ALC cable to linear? in Accessories
    I'm not sure where you got the Michelle from. Friends call me by my middle name, Mitchell, and my log in name is MitchellB, but you are right about my first name being Dalmer. Generally I'll answer to Hey You also. I was five years old before I knew my name was not dam-it-boy. :) I used to be a welder in my former life, so I know about the heat, sparks and the funky dance routine electrical energy can create, but it never hurts to be warned. Thanks. So with the ARB704 interface, you agree the ALC cable is not needed? If I buy new, I am leaning with the Ameritron AL811 (600 watt max out), which I believe has the power supply built in. That will about max out my toy funds right now, but I am not in a large hurry and may save up for something nicer. If I buy used, I'm still trying to familiarize myself with what ever I run across as to value, condition and whether it will work with what I got. I do not have a problem replacing components, but I am not real good at figuring out what needs to...
    6 replies | 287 view(s)
  • 5B4AJB's Avatar
    Yesterday, 12:05
    5B4AJB replied to a thread Calling Frequencies in The Junk Box
    We used 145.300 for FM RTTY in the UK. FM Morse was 145.250 Packet was 144.650, but I think they've moved since the 90's PSK is probably around 144.130 (not tried that) Just listen around for a bit, several scanners/receivers will soon find any activity. I only got told off once for not calling on the "calling frequency" by a Raynet operator that I woke up ;)
    6 replies | 247 view(s)
  • K7KBN's Avatar
    Yesterday, 02:58
    4X4DAD would be a valid callsign in Israel... Mazel tov!
    4 replies | 137 view(s)
  • WA9WVX's Avatar
    Yesterday, 00:39
    Hello 4x4Dad, Assuming you're an Amateur Radio Operator, I would contact the local Club and some of the members should have the proper equipment for removing and erecting the tower on your property but an installation on your property will require either a City or County Building Permit before you dig the hole. You'll need all of Mechanical Specifications for that tower to provide the Building Department and if you fore go this, either the City, Suburb or County will RED TAG the tower and force you to take it down at your expense. There is a FCC Document called PRB-1 that can be supplied by the American Radio Relay League, Inc. pertains to Amateur Radio Towers ONLY, NOT CB, TV, Business Radio Services or WiFi Links. As to the tower that you have described, it sounds like a Rohn 25 G (Guyed) Tower, manufactured in Indiana. Rohn's main Engineering Headquarters in located in Peoria, Illinois by these towers are sold by authorized Dealers all over the United States. Here's their website...
    4 replies | 137 view(s)
  • Sudden's Avatar
    Sun 15th Oct 2017, 23:12
    Sudden replied to a thread First yagi in Antennas
    It would be two single wires twisted together, no loop involved. It will be made of lightweight wood. It is also designated as a temporary antenna and not to be used in the wet.
    3 replies | 157 view(s)
  • WA9WVX's Avatar
    Sun 15th Oct 2017, 22:34
    WA9WVX replied to a thread ALC cable to linear? in Accessories
    Hello Michelle or is it Dalmer M Badgett, As you might imagine I'm a bit confused who I'm really consulting with as I went out to the QRZ.com website and discovered this information. At this time I would hold back from purchasing a Solid State 1500 W RF Linear Amplifier because you'll need a +50 VDC at 50 to 60 Ampere Power Supply and these are NOT inexpensive compared to a traditional Tube Amplifier. An ARB-704 will interface with your FT-847 transceiver and practically any RF Tube Amplifier and I believe it does the ALC Detecting / Converting to the lower -4 VDC that the FT-847 requires. Since you have stated, "since I only know enough about electronics to make me dangerous" that doesn't give me a Warm & Fuzzy Feeling so be very careful when you're dealing with a high power RF Amplifier as they're Very High Voltages within the Amplifier cabinet. Safety First! These voltages are high enough to kill an individual ... I've always worked around these kind of voltages in my former career in Electronics &...
    6 replies | 287 view(s)
  • paulears's Avatar
    Sun 15th Oct 2017, 20:24
    paulears replied to a thread First yagi in Antennas
    The trouble with this idea is that practically, I doubt you'd notice a problem, but you are introducing a loop which could circulate current. The twisting would tend to prevent it, but as the intention is to maximise gain and efficiency, personally I'd simply have a single radiator conductor. Remember timber has a moisture content that will change when wet, again to the detriment of the antenna efficiency. For 70Mhz, each element is going to be over a mtr long, so something rigid is vital. 2m of wood end to end is a weighty object. Maybe old fishing rods? something like that? Mind you, the DIY stores sell aluminium tube? Maybe that would be better?
    3 replies | 157 view(s)
  • charlie's Avatar
    Sun 15th Oct 2017, 19:59
    charlie replied to a thread Band Conditions in Propagation
    Many thanks, Dan. Gives me something to consider. All I worked for 25 years was 40 cw except for a lil am in 62. Charlie
    2 replies | 180 view(s)
  • Sudden's Avatar
    Sun 15th Oct 2017, 19:40
    Sudden started a thread First yagi in Antennas
    I am making my first yagi. It is for 70MHz. I am proposing to use wire for the dipole and elements. It is insulated single core 0.5mm If I twisted two legths of wire together ( like a twisted pair) would it improve reception/transmission or make no difference. Just incase you thought I was using sky hooks I thought I should say that the wire would be fixed to lengths of thin wood mounted on a wooden boom.
    3 replies | 157 view(s)
  • Sudden's Avatar
    Sun 15th Oct 2017, 19:14
    Sudden replied to a thread HF Antenna Advice Please in Antennas
    Can you get into the attic and run a wire high up in the apex of the roof. Or run a wire around the house behind the guttering. Just tell them you are cleaning the gutter.
    2 replies | 154 view(s)
  • paulears's Avatar
    Sun 15th Oct 2017, 18:22
    paulears replied to a thread Kenwood Rx1000 in Antennas
    Also remember that PL259 is a 50Ohm connector, and as RG6 is 75Ohm, there aren't, to the best of my knowledge, any connectors because for transmit - RG6 is no use. A bit of mismatch on receive doesn't really matter that much.
    23 replies | 560 view(s)
  • paulears's Avatar
    Sun 15th Oct 2017, 18:20
    paulears replied to a thread Calling Frequencies in The Junk Box
    I think the reason for the change is procedure was simply that calling frequencies are notorious for being totally empty or a massive pileup. Most operators would always hunt back and forth around the calling frequency, with the knob - I'd do a couple of turns one way, and a couple of turns the other way if listening, and for a call, I;d just go up or down a small amount from the calling frequency. I suspect loads of people did this anyway, so the COA is a sensible pointer and not some kind of rule!
    6 replies | 247 view(s)
  • hogflyer's Avatar
    Sun 15th Oct 2017, 17:34
    hogflyer started a thread Handheld Radios Yaesu FT-470 talkie batteries. in Yaesu
    Hey all, first time poster, user to this group, landed a Yaesu 470 talkie, sellar supplied me with NC-29 drop in charger for older nicad batteries, radio came with only one NiMH battery newer battery than what was made 30yrs ago. Is it safe to charge this battery in a nicad charger? upon using this charger couple days ago, the 7.2 1400Mah NiMH battery gets extremely hot when charging it. I pulled it out, hopefully as not too damage this battery. Comments suggestions? thanks, hogflyer from central TX.
    0 replies | 62 view(s)
  • G1SCY's Avatar
    Sun 15th Oct 2017, 17:11
    G1SCY started a thread SWR Meter in Accessories
    Any one got a half decent SWR meter they would like to sell me Please
    0 replies | 112 view(s)
  • Sudden's Avatar
    Sun 15th Oct 2017, 16:23
    Are there any labels with numbers on the units ie Serial number, Model number?
    2 replies | 247 view(s)
  • 4x4Dad's Avatar
    Sun 15th Oct 2017, 15:58
    My neighbor has a tower she would like to have removed . I'd like to put it up at my house . I've never taken down a tower . It's steel and seems to be bolted together in 10 ft sections . It's 3 pipes in triangle with sigzag wire rod running up all 3 sides . I do not have a (gin ? ) pole . The local rental has a tow behind cherry picker with a 50 ft reach . Do you think the picker is my best option ? Any suggestions are greatly appreciated .
    4 replies | 137 view(s)
  • sid's Avatar
    Sun 15th Oct 2017, 15:57
    sid started a thread Hi All in Introduce yourself
    Another newbie to this hobby here. No licence yet, but I intend to take it early in the new year when I have more time. I have got the buying bug though... Baofengs... UV-5R UV-82 GT3-WP (The best of the Baofengs imo..)
    0 replies | 78 view(s)
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