Topband: Pennant Feed & Termination Product question
I was wondering if any one has had personal experience with this product: http://www.minstech.com/hamradio.php?pid=21 Comments? Its a Feed & Resistor kit for a Pennant/Flag antenna.. this specific one is for 50 ohm cable. (I just happen to have alot of 50 ohm on hand that is very well shielded) -Steve Raas N2JDQ ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: 4 sq receive and high power
I have been involved with beta testing for the Hi-Z 4 and Hi-Z 8 arrays. The testing involved two different sites with Hi-Z 4, Hi-Z 8 (160 version), and Hi-Z 8 (80) arrays. The majority of my testing involved performance evaluation with very low signal levels in a very low noise environment. Testing involved the standard antenna amps as well as the new Plus6 amps (the Plus6 performance is quite good). Coincidentally I have found the Hi-Z systems to be robust with regard to avoiding damage due to reasonably high RF exposure (from TX antennas) as well as not passing through excessive RF to the rig receive port when under those conditions. 73. . .Dave W0FLS - Original Message - From: "Hardy Landskov" To: "Ignacy Misztal" ; Sent: Wednesday, January 04, 2012 8:14 PM Subject: Re: Topband: 4 sq receive and high power > Ignacy, > I have a K7TJR 4 square. In fact I was one of the beta testers way back > and > I have measured +15 dBm using an HP 435A power meter on the 4 square when > transmitting 1500 watts on my Delta Loop which is 160 feet away. The > receive > patterns are very distorted according to EZNEC when I put all the towers > and > antennas in the file BUT it still works great and I have not had any rx > amp > failures. I was surprised but the Hi-Z amps are very bullet proof. > 73 & HNY Hardy N7RT > > > - Original Message - > From: "Ignacy Misztal" > To: > Sent: Wednesday, January 04, 2012 6:47 PM > Subject: Topband: 4 sq receive and high power > > >>I was planning to buy a 4 sq receive system for the upcoming CQ160 >>contest. >> One question is about handling of high power when the 4sq cannot be put >> far >> away from the tx antenna. HI-Z claims that their system is immune to high >> power. DX Engineering claims the opposite and requires a sequencer. The >> sequencer adds complexity and cost. >> >> Did anyone experience a damaged amp in those systems? Would clamping the >> input of a vertical with 2 back to back diodes be acceptable? >> >> On a different note, the Hi-Z site states new legal problems and no >> sales. >> There 4 sq was about $770 with new amps. However, DX Enginnering has an >> "electrical only" option to HI-Z for $799 that appears equivalent to >> Hi-Z. >> However it is sold out. So neither is available. Not sure there is >> another >> viable option. >> >> Ignacy, NO9E >> ___ >> UR RST IS ... ... ..9 QSB QSB - hw? BK > > ___ > UR RST IS ... ... ..9 QSB QSB - hw? BK > ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: 4 sq receive and high power
My Hi-Z Three Element Array North Antenna is not more than 40 feet from where my Inverted L Horizontal runs - the INVL Vertical is maybe 60 feet away. I have run 1500w an not a problem at all. I had a DXE 4 Square at my for QTH and it had to be 700 feet away from my closest TX Antenna - The Hi-Z is a great RX antenna system. -Original Message- From: topband-boun...@contesting.com [mailto:topband-boun...@contesting.com] On Behalf Of Hardy Landskov Sent: Wednesday, January 04, 2012 9:14 PM To: Ignacy Misztal; topband@contesting.com Subject: Re: Topband: 4 sq receive and high power Ignacy, I have a K7TJR 4 square. In fact I was one of the beta testers way back and I have measured +15 dBm using an HP 435A power meter on the 4 square when transmitting 1500 watts on my Delta Loop which is 160 feet away. The receive patterns are very distorted according to EZNEC when I put all the towers and antennas in the file BUT it still works great and I have not had any rx amp failures. I was surprised but the Hi-Z amps are very bullet proof. 73 & HNY Hardy N7RT - Original Message - From: "Ignacy Misztal" To: Sent: Wednesday, January 04, 2012 6:47 PM Subject: Topband: 4 sq receive and high power >I was planning to buy a 4 sq receive system for the upcoming CQ160 contest. > One question is about handling of high power when the 4sq cannot be put > far > away from the tx antenna. HI-Z claims that their system is immune to high > power. DX Engineering claims the opposite and requires a sequencer. The > sequencer adds complexity and cost. > > Did anyone experience a damaged amp in those systems? Would clamping the > input of a vertical with 2 back to back diodes be acceptable? > > On a different note, the Hi-Z site states new legal problems and no sales. > There 4 sq was about $770 with new amps. However, DX Enginnering has an > "electrical only" option to HI-Z for $799 that appears equivalent to Hi-Z. > However it is sold out. So neither is available. Not sure there is another > viable option. > > Ignacy, NO9E > ___ > UR RST IS ... ... ..9 QSB QSB - hw? BK ___ UR RST IS ... ... ..9 QSB QSB - hw? BK ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: 4 sq receive and high power
Ignacy, I have a K7TJR 4 square. In fact I was one of the beta testers way back and I have measured +15 dBm using an HP 435A power meter on the 4 square when transmitting 1500 watts on my Delta Loop which is 160 feet away. The receive patterns are very distorted according to EZNEC when I put all the towers and antennas in the file BUT it still works great and I have not had any rx amp failures. I was surprised but the Hi-Z amps are very bullet proof. 73 & HNY Hardy N7RT - Original Message - From: "Ignacy Misztal" To: Sent: Wednesday, January 04, 2012 6:47 PM Subject: Topband: 4 sq receive and high power >I was planning to buy a 4 sq receive system for the upcoming CQ160 contest. > One question is about handling of high power when the 4sq cannot be put > far > away from the tx antenna. HI-Z claims that their system is immune to high > power. DX Engineering claims the opposite and requires a sequencer. The > sequencer adds complexity and cost. > > Did anyone experience a damaged amp in those systems? Would clamping the > input of a vertical with 2 back to back diodes be acceptable? > > On a different note, the Hi-Z site states new legal problems and no sales. > There 4 sq was about $770 with new amps. However, DX Enginnering has an > "electrical only" option to HI-Z for $799 that appears equivalent to Hi-Z. > However it is sold out. So neither is available. Not sure there is another > viable option. > > Ignacy, NO9E > ___ > UR RST IS ... ... ..9 QSB QSB - hw? BK ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Topband: 4 sq receive and high power
I was planning to buy a 4 sq receive system for the upcoming CQ160 contest. One question is about handling of high power when the 4sq cannot be put far away from the tx antenna. HI-Z claims that their system is immune to high power. DX Engineering claims the opposite and requires a sequencer. The sequencer adds complexity and cost. Did anyone experience a damaged amp in those systems? Would clamping the input of a vertical with 2 back to back diodes be acceptable? On a different note, the Hi-Z site states new legal problems and no sales. There 4 sq was about $770 with new amps. However, DX Enginnering has an "electrical only" option to HI-Z for $799 that appears equivalent to Hi-Z. However it is sold out. So neither is available. Not sure there is another viable option. Ignacy, NO9E ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: TL0CW QSL's
Frank, Not me. You asked the question I was considering. 73 Don K5AQ ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: TL0CW QSL's
not here yet. Don N1DG At 05:58 PM 1/4/2012, Frank Davis wrote: >Has anyone rec'd QSL's yet for Topband? > >Frank VO1HP > >Sent from an iPad2 >___ >UR RST IS ... ... ..9 QSB QSB - hw? BK - N1DG--Licensed since 1962 EX-WB2DND, A61AD (GUEST OP, QSL MGR), /VP8O, /KH4, A52DG, /KH9, /BV, /VS6, /4X, /9V /A7 Webmaster: VP8O, K4M, BS7H, 3Y0X, K5K, A52A, VK0IR, 9M0C, ZK1XXP, WB2DND/KH9, BQ9P, ZL9CI 2006 inductee into the CQ Magazine DX Hall of Fame Member: NCDXF, CWops, ARRL, DDXA, YCCC AIM SKYPE: aurumtel Please consider the environment before printing this email ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Topband: TL0CW QSL's
Has anyone rec'd QSL's yet for Topband? Frank VO1HP Sent from an iPad2 ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: Xtal Filter +1
On Wed, 2012-01-04 at 10:06 -0800, Rick Karlquist wrote: > Bill Cromwell wrote: > > > meters). One of the problems with high levels of electrical noise is > > overloading of the front end and blocking of the receiver. Therefore > > noise that is not actually on or very nearly on your operating frequency > > jams you up. I am also investigating some of the loop antennas to use > > I don't see how noise overload of the receiver front end can > be an issue. You can simply add front end attenuation such > that the external noise just overcomes the receiver's internal > noise. It would only be an issue if somehow there was much more > noise just outside the 160 meter ham band than there was inside > the 160 meter ham band. How would that ever happen? Hi, I don't think the front end xtal filters are a bulletproof fix, either. They might contribute to a solution. Come to my shack when the guy over in the body shop starts up his welder. He isn't in the 160 meter band but his hash is strong enough to tip over my superhets with rf amps and active mixers. I can just tell he is welding with the Atlas. There is also a paging transmitter line of sight and I sometimes get a strong dose of RF from that. The ricebox won't tolerate that. The other radios don't seem to notice. There are other assorted large doses of electronic crud that come and go here. I used to live in the boonies, too. No problems there..just like you. I used to ask the same. How could that be possible. It's possible. I guarantee it. I wonder why they call it civilized. 73, Bill KU8H ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: Xtal Filter
Sherwood hasn't sold that FE 1825 - 1830 filter in years. That is why I suggested the INRAD filter which is 5 KHz wide centered on 1822.5 KHz. INRAD #807 http://www.inrad.net/product.php?productid=231&cat=146&page=1 73, Tim K3LR -Original Message- From: topband-boun...@contesting.com [mailto:topband-boun...@contesting.com] On Behalf Of Craig Clark Sent: Wednesday, January 04, 2012 12:46 PM To: topband@contesting.com Subject: Topband: Xtal Filter Tim and others, What about the filter Sherwood sold for the "old" DX window 1825-1830?? Craig Craig Clark K1QX Radioware PO Box 209 107 Fitzgerald Rd Rindge NH 03461 (603) 899-6957 ___ UR RST IS ... ... ..9 QSB QSB - hw? BK ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Topband: Xtal Filter
Message: 3 Date: Wed, 4 Jan 2012 09:38:35 +0800 (SGT) From: Anton Moehammad Subject: Topband: Xtal Filter To: "topband@contesting.com" Message-ID: <1325641115.89785.yahoomail...@web190006.mail.sg3.yahoo.com> Content-Type: text/plain; charset=utf-8 Hi everybody, I believe there is a 1825 KHZ xtal filter sell somewhere, can any body share their experience about put a narrow XTAL filter in front of their recv ? (CW works only) ? Ir Moeh AntonHendra Jambon Tengah no 290 RT1/RW3 Magelang 56121 Indonesia Mobile : +6285292611160 email?? : moehan...@yahoo.com Get a signature like this. CLICK HERE. ? Tim and others, What about the filter Sherwood sold for the "old" DX window 1825-1830?? Craig Craig Clark K1QX Radioware PO Box 209 107 Fitzgerald Rd Rindge NH 03461 (603) 899-6957 ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: Xtal Filter +1
Bill Cromwell wrote: > meters). One of the problems with high levels of electrical noise is > overloading of the front end and blocking of the receiver. Therefore > noise that is not actually on or very nearly on your operating frequency > jams you up. I am also investigating some of the loop antennas to use I don't see how noise overload of the receiver front end can be an issue. You can simply add front end attenuation such that the external noise just overcomes the receiver's internal noise. It would only be an issue if somehow there was much more noise just outside the 160 meter ham band than there was inside the 160 meter ham band. How would that ever happen? > along with the high level mixers (NO rf amp and none needed on 160 > through 20 meters). That Xtal filter used ahead of such a receiver and > possibly with one of those antennas that can null out some (or all) of > the noise should get Anton happily on the air. > The loop I described in the National Contest Journal is fairly sensitive and certainly doesn't require an external RF amp. It may or may not need to have the transceiver's internal RF amp enabled. If you build the 40 foot circumference version, you get about another 9 dB of signal output. There seems to be a notion here that xtal filters are somehow a bulletproof front end fix. However, the third order intercept of the filters is not necessarily all that high. Although they are "passive", that doesn't mean they are linear when driven hard. This topic was covered extensively in "Technical Topics" in RSGB Radio Communication (I don't have specific citations). The reason why crystals are non linear is that the extremely high Q results in tremendous acceleration effects on the quartz even for 1 mW drive. It is not unusual to see hundreds of thousands of G's of acceleration. Rick N6RK ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: Additional 160 & 80m FCP and BOG Antenna files now available
Jack, I may have missed it when i read the new information, does the 80m FCP also need 8' Vertical space abt ground like the 160m Version? -Steve N2JDQ On Wed, Jan 4, 2012 at 12:06 PM, Bill Cromwell wrote: > On Wed, 2012-01-04 at 11:34 -0500, W0UCE wrote: > > My K2AV Low Band Antenna Page has been updated with the following > > information: > > > > > > > > 1. 160m FCP performance data > > > > 2. 80m FCP and Isolation Transformer information > > > > 3. Dual FCP (80 & 160) FCPs and Isolation Transformers > > > > 4. EZNEC File for 2 Wire BOG RX Antennas > > > > > > > > Visit: http://www.w0uce.net/K2AVantennas.html > > > > > > > > 73, > > > > Jack > > > > ___ > > UR RST IS ... ... ..9 QSB QSB - hw? BK > > Hi Jack, > > I just made some comments in a thread regarding multi band operation > with the FCP. Thanks for the updated information. I am going to make a > wild guess that I can add an FCP for 40 and perhaps 30 meters as well. I > prefer to operate even when power is not available so I won't be using > relays in my system. I don't mind going out the back door for a minute > even in winter to change bands. I've done that before and I'm still > young enough to manhandle my walker out there . We are > into winter weather and snow drifts now so it's an ideal time to put up > one of these and invoke Murphy's Antenna Corollary for the inverse > relationship between install weather and performance. > > 73, > > Bill KU8H > > ___ > UR RST IS ... ... ..9 QSB QSB - hw? BK > ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: Additional 160 & 80m FCP and BOG Antenna files now available
On Wed, 2012-01-04 at 11:34 -0500, W0UCE wrote: > My K2AV Low Band Antenna Page has been updated with the following > information: > > > > 1. 160m FCP performance data > > 2. 80m FCP and Isolation Transformer information > > 3. Dual FCP (80 & 160) FCPs and Isolation Transformers > > 4. EZNEC File for 2 Wire BOG RX Antennas > > > > Visit: http://www.w0uce.net/K2AVantennas.html > > > > 73, > > Jack > > ___ > UR RST IS ... ... ..9 QSB QSB - hw? BK Hi Jack, I just made some comments in a thread regarding multi band operation with the FCP. Thanks for the updated information. I am going to make a wild guess that I can add an FCP for 40 and perhaps 30 meters as well. I prefer to operate even when power is not available so I won't be using relays in my system. I don't mind going out the back door for a minute even in winter to change bands. I've done that before and I'm still young enough to manhandle my walker out there . We are into winter weather and snow drifts now so it's an ideal time to put up one of these and invoke Murphy's Antenna Corollary for the inverse relationship between install weather and performance. 73, Bill KU8H ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Topband: Additional 160 & 80m FCP and BOG Antenna files now available
My K2AV Low Band Antenna Page has been updated with the following information: 1. 160m FCP performance data 2. 80m FCP and Isolation Transformer information 3. Dual FCP (80 & 160) FCPs and Isolation Transformers 4. EZNEC File for 2 Wire BOG RX Antennas Visit: http://www.w0uce.net/K2AVantennas.html 73, Jack ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: Xtal Filter
The Rockmite QRPp transceiver kit by Small Wonder Labs is crystal controlled on a single frequency and uses a single crystal ahead of the receiver for filtering. Many thousands have been sold and are on the air and there is also a Rockmite Yahoo group. Google Rockmite. jim / W1FMR --- On Tue, 1/3/12, Tim Duffy K3LR wrote: From: Tim Duffy K3LR Subject: Re: Topband: Xtal Filter To: "'Anton Moehammad'" , topband@contesting.com Date: Tuesday, January 3, 2012, 9:16 PM Hello Anton! Here is a link to a 5 KHz 160 meter RX filter y INRAD. This may be what you are asking about? http://www.inrad.net/product.php?productid=231&cat=146&page=1 73 and Happy New Year, Tim K3LR -Original Message- From: topband-boun...@contesting.com [mailto:topband-boun...@contesting.com] On Behalf Of Anton Moehammad Sent: Tuesday, January 03, 2012 7:39 PM To: topband@contesting.com Subject: Topband: Xtal Filter Hi everybody, I believe there is a 1825 KHZ xtal filter sell somewhere, can any body share their experience about put a narrow XTAL filter in front of their recv ? (CW works only) Ir Moeh AntonHendra Jambon Tengah no 290 RT1/RW3 Magelang 56121 Indonesia Mobile : +6285292611160 email : moehan...@yahoo.com Get a signature like this. CLICK HERE. ___ UR RST IS ... ... ..9 QSB QSB - hw? BK ___ UR RST IS ... ... ..9 QSB QSB - hw? BK ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: CONNECTORS AND CABLE
Loss at 160 is determined by the thickness of the copper plating and even the best will have a bit more loss than all copper. An additional 1dB/100' of resistive loss in a 200-300' run means nothing and with a well constructed Beverage wont even require a preamp. Its the loss from water into the foam and aluminum that you dont want. These days Im running 50-300' of RG-6 to the switch boxes and 700' of 1/2" CATV hardline back to the house. The RG-6 is elevated thru bushes and low branches as rodent prevention and the hardline has been on the ground about 22 years. With good grounds and plenty of ferrite there is no detectable common mode radiation. Carl KM1H - Original Message - From: "Doug Renwick" To: Sent: Tuesday, January 03, 2012 2:48 PM Subject: Re: Topband: CONNECTORS AND CABLE > Here we go again. One camp saying don't go cheap and another camp saying > cheap is fine. I pay 5 cents a foot for flooded RG-6 from Shaw Cable. > Copper coated steel center plus braid and foil. My receive 4 square run > is > about 700 feet. I can hear more than I can work. I don't need expensive > RG-6 for rodents to chew on. The rodents enjoy the cheap cable. Cheap in > price but just maybe not cheap in quality. YMMV. > > Doug > >>-Original Message- >> >>On 1/3/2012 7:06 AM, Andrey Fedorishchev wrote: >>> Cheap RG6, the one with CCS center conductor, sometimes shows quiet high >>> losses (few db per 300ft.) at 1-5 mhz and at the same time quiet low at >>> higher frequencies; >>> >>> Not only the losses but signal leakage is important and not every brand > of >>> RG213 or RG6 is suitable at some instalations; >> >>Yes on both counts. I've written a Q&A style tutorial about coax that >>addresses these issues, and a lot more. >>http://audiosystemsgroup.com/Coax-Stubs.pdf >> >>Another point -- some of us DO have long runs to our antennas, so losses >>can be significant. I have two runs to TX antennas that are 350 ft and >>two for 160M that are 280 ft. My neighbor, K6XX, has some runs that are >>nearly 1,000 ft, for which he's using parallel runs of hard line. >> >>73, Jim K9YC > > ___ > UR RST IS ... ... ..9 QSB QSB - hw? BK > > > - > No virus found in this message. > Checked by AVG - www.avg.com > Version: 10.0.1416 / Virus Database: 2109/4120 - Release Date: 01/03/12 > ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: CONNECTORS AND CABLE
- Original Message - From: "Jim Brown" To: Sent: Tuesday, January 03, 2012 3:27 PM Subject: Re: Topband: CONNECTORS AND CABLE > On 1/3/2012 11:48 AM, Doug Renwick wrote: >> One camp saying don't go cheap and another camp saying >> cheap is fine. I pay 5 cents a foot for flooded RG-6 from Shaw Cable. >> Copper coated steel center plus braid and foil. My receive 4 square run >> is >> about 700 feet. I can hear more than I can work. I don't need expensive >> RG-6 for rodents to chew on. The rodents enjoy the cheap cable. Cheap >> in >> price but just maybe not cheap in quality. > > Loss doesn't matter for RX antennas, but shielding does. DXE says that > the flooded Commscope RG6 they sell resists rodents. Commscope is a good > cable company. I laid two runs of a non-flooded Commscope RG6 (on the > order of 300-400 ft) on the ground almost five years ago to feed my > Beverages, and so far no obvious problems. And we DO have rodents -- > rats, squirrels, and gophers that I know of. Because it has a steel > center and fairly light braid, I wouldn't use it for TX on the lower > bands, for reasons noted in the tutorial. > > 73, Jim K9YC Commscope cable is no more rodent proof than any other quality brand. If DXE charges more for it then its not worth it economically. I also use Commscope but I buy in 1000' reels via my Tessco commercial acount or from a local CATV installer. Rodent problems in CA are likely a lot different than here in NH and many other places. When the temperatures get well below freezing mice find coax something to at least taste and then leave alone but the damage is done. When everything else is frozen solid the cable riding on top of or thru the leaves are pure temptation. I had "something" chew a length of #10 stranded completely thru in 4 places and partially in several more in about a 100' stretch of a 500' BOG late last winter; nothing else was touched but that territorial hunk!! I dont like splicing when its below freezing! Carl KM1H > ___ > UR RST IS ... ... ..9 QSB QSB - hw? BK > > > - > No virus found in this message. > Checked by AVG - www.avg.com > Version: 10.0.1416 / Virus Database: 2109/4120 - Release Date: 01/03/12 > ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Topband: Toward better antennas
Hi, My initial effort at getting "something...anything" up for an antenna has produced mediocre results - as expected. Maybe a little more mediocre than I was hoping for. I can hear with it pretty well. It's just a big, end fed wire too close to the ground... about 20 feet up with a counterpoise wire. I can probably do some trimming and tuning to get some modest improvements. My plan though is to use it as-is on 160-80-40-30 while I put up something better. On my small lot I can accommodate a K9AY loop antenna system. There may be differing opinions (supported by hard numbers) about better antennas but there are NO beverages nor *large* antennas in my future. One of the first things I noticed is the K9AY loop is a receiving antenna (that puny terminating resistor). That will leave me with the need for yet another 160 meter antenna to use for transmitting. I can get some kind of a vertical up but the size of my lot is a factor. The public safety people will want it able to fall and not damage the neighbor's house. I can easily do something around 40 feet and I can get some radials down. In some directions they will have to be shorter than in other directions (boundary lines ya know). 40 feet is far short of a quarter wavelength on 160. Short designs use loading coils and hats and all manner of voodoo to operate. Eventually I can get my end fed wire up around 50 feet. It is curved around in a crescent shape from one side of my property..across the back... and part way up the other side for a total of about 170 feet. Much bigger than a 40 foot vertical! Should I expect better results with the wire elevated than with a 40 foot vertical on 160? I have had very good results on 80 and 40 with that same wire but higher than the 20 feet I have now. I have never used a vertical on HF or MF. When some younger blood is available I will be putting the wire support system with marine grade blocks (pulleys to you Marine Corps types) and halyards to put the wire near treetop levels (about 50 feet). The 40 foot vertical can be used on the higher HF bands and forget about 160 on it. 73, Bill ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: Xtal Filter +1
Hi all, I believe You are looking for something like tunable xtal front-end preselector which I build for several of my ham friends years ago and posted there: http://www.radio.qrp.cz/1/clanky06/preseletor.htm Originaly it was published by Peter, G3IPV in the ham radio magazines years ago. The main issue in practice is the small tunning range otherwise it works like champ. 73 - Petr, OK1RP --- http://topband.blog.cz > -Original Message- > From: topband-boun...@contesting.com > [mailto:topband-boun...@contesting.com] On Behalf Of Anton Moehammad > Sent: Tuesday, January 03, 2012 7:39 PM > To: topband@contesting.com > Subject: Topband: Xtal Filter > > Hi everybody, > > I believe there is a 1825 KHZ xtal filter sell somewhere, can any body > share their experience about put a narrow XTAL filter in front of their > recv ? (CW works only) > > > > Ir Moeh AntonHendra > Jambon Tengah no 290 RT1/RW3 > Magelang 56121 > Indonesia > Mobile : +6285292611160 > email : moehan...@yahoo.com > Get a signature like this. CLICK HERE. > ___ > UR RST IS ... ... ..9 QSB QSB - hw? BK > > ___ > UR RST IS ... ... ..9 QSB QSB - hw? BK ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
